diff --git a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
index 3605e8f3fc9..76b44d9e9cf 100644
--- a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -4,7 +4,7 @@
     expected: TIMEOUT
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Fetching a blob URL immediately before revoking it works in an iframe.]
     expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
index 4a1e8110f6f..f8e7e539aae 100644
--- a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,3 +2,6 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
+  [Hit test within unscaled box]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index d080f72a962..a6c39d50087 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -8,6 +8,3 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
-  [doesn't look up handleEvent method on callable event listeners]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
index c131078eace..23c61ede1a1 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
@@ -17,3 +17,6 @@
   [test the top of layer]
     expected: FAIL
 
+  [test some point of the element: top left corner]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini
index 3bd0a5266dd..239c35135e4 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini
@@ -1,85 +1,7 @@
 [offsetTopLeft-border-box.html]
-  [container: 11]
-    expected: FAIL
-
-  [container: 10]
-    expected: FAIL
-
-  [container: 13]
-    expected: FAIL
-
-  [container: 12]
-    expected: FAIL
-
-  [container: 15]
-    expected: FAIL
-
-  [container: 14]
-    expected: FAIL
-
-  [container: 17]
-    expected: FAIL
-
-  [container: 16]
-    expected: FAIL
-
-  [container: 19]
-    expected: FAIL
-
-  [container: 18]
-    expected: FAIL
-
-  [container: 9]
-    expected: FAIL
-
-  [container: 8]
-    expected: FAIL
-
   [container: 1]
     expected: FAIL
 
   [container: 0]
     expected: FAIL
 
-  [container: 3]
-    expected: FAIL
-
-  [container: 2]
-    expected: FAIL
-
-  [container: 5]
-    expected: FAIL
-
-  [container: 4]
-    expected: FAIL
-
-  [container: 7]
-    expected: FAIL
-
-  [container: 6]
-    expected: FAIL
-
-  [container: 20]
-    expected: FAIL
-
-  [container: 21]
-    expected: FAIL
-
-  [container: 22]
-    expected: FAIL
-
-  [container: 23]
-    expected: FAIL
-
-  [container: 24]
-    expected: FAIL
-
-  [container: 25]
-    expected: FAIL
-
-  [container: 26]
-    expected: FAIL
-
-  [container: 27]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index 987cea68562..ae2bd6e1de2 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
@@ -312,24 +312,21 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/plain */*]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
index e67f0406fc3..d2df9b78483 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
@@ -53,3 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
+  [separate text/javascript x/x]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
index 30e1b851fd4..fb0ce3ea7db 100644
--- a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,9 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20%22nosniFF%22]
+    expected: FAIL
+
+  [X-Content-Type-Options%3A%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
new file mode 100644
index 00000000000..735a9a75a2a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
@@ -0,0 +1,2 @@
+[cross-origin-objects-on-new-window.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
index f29162631b3..9a85a905394 100644
--- a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,8 +1,7 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
   [opener of discarded nested browsing context]
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/dom/elements/the-innertext-idl-attribute/getter.html.ini b/tests/wpt/metadata-layout-2020/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
index f2c57c9cc19..774ae12c55e 100644
--- a/tests/wpt/metadata-layout-2020/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
@@ -299,3 +299,6 @@
   [No tab on table-cell itself ("<table><tr><td id=target>abc</td><td>def</td>")]
     expected: FAIL
 
+  [<svg> text contents preserved ("<div><svg><text>abc</text></svg></div>")]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 88f4ddd0e9a..92008abe69f 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_escaping-1.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index daa518bd0e3..c6f45be1eb2 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 338d283eb0e..93673c2a0db 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
new file mode 100644
index 00000000000..633a99517d3
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-2.html]
+  [preventDefault should allow onclick submit() to succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 450c88bd32b..dbec6f2c2ff 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -3,6 +3,3 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
-  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 5ddb9bfeff6..a1effd5f801 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry-different-function-realm.html.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry-different-function-realm.html.ini
new file mode 100644
index 00000000000..20f3693b573
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry-different-function-realm.html.ini
@@ -0,0 +1,5 @@
+[entry-different-function-realm.html]
+  expected: ERROR
+  [Start function]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry.html.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry.html.ini
new file mode 100644
index 00000000000..0f5d2ac06e5
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/entry.html.ini
@@ -0,0 +1,7 @@
+[entry.html]
+  [Start function]
+    expected: FAIL
+
+  [Sanity check: this all works as expected synchronously]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/incumbent.html.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/incumbent.html.ini
new file mode 100644
index 00000000000..2b603de3c95
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/functions/incumbent.html.ini
@@ -0,0 +1,5 @@
+[incumbent.html]
+  expected: TIMEOUT
+  [Start function]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
deleted file mode 100644
index 663a1f8fa30..00000000000
--- a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini b/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
index dd49aa8e457..c2c57aec558 100644
--- a/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
+++ b/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
@@ -1,5 +1,4 @@
 [003.html]
-  expected: ERROR
   [shared]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
index faa00f45ecf..d4f62ed7113 100644
--- a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: TIMEOUT
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 98ea0e8a27c..fffa7d6c263 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -10973,6 +10973,13 @@
        {}
       ]
      ],
+     "text-decoration-thickness-nesting-manual.html": [
+      "b436761bc5465f1b18b916c964da3be2ac0eb470",
+      [
+       null,
+       {}
+      ]
+     ],
      "text-underline-position-019-manual.html": [
       "0308fbc8c9ed4b54865a5b382741c148c6853981",
       [
@@ -17259,6 +17266,27 @@
       null,
       {}
      ]
+    ],
+    "showDirectoryPicker-manual.https.html": [
+     "b19287877f759d87c565548fe32b0c9895ae1bd2",
+     [
+      null,
+      {}
+     ]
+    ],
+    "showOpenFilePicker-manual.https.html": [
+     "b55157ad20fc75b12e7850d422af9492c5f28cbc",
+     [
+      null,
+      {}
+     ]
+    ],
+    "showSaveFilePicker-manual.https.html": [
+     "f8280d29ff59cf8558f7adfec83df77ef7dfa14f",
+     [
+      null,
+      {}
+     ]
     ]
    },
    "notifications": {
@@ -118412,12 +118440,12 @@
       ]
      ],
      "background-image-007.html": [
-      "388b221e833460e9a2dbf77900aec954f014b76e",
+      "9bccd2d364a64f20f879d6825fcc60c49f32cd11",
       [
        null,
        [
         [
-         "/css/css-backgrounds/reference/background-image-001-ref.html",
+         "/css/reference/ref-filled-green-100px-square.xht",
          "=="
         ]
        ],
@@ -165862,6 +165890,58 @@
         {}
        ]
       ],
+      "intrinsic-size-005.tentative.html": [
+       "697e773be1d3bccb748bea0828b390fb1ae18631",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "intrinsic-size-006.tentative.html": [
+       "fa736e92267cd4d6c947a0e275f00c9952074c8e",
+       [
+        null,
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       "requirements.txt": [
@@ -349900,20 +350172,20 @@
        []
       ],
       "setup.cfg": [
-       "d309fdaa3f42e009316adad1140d1a0dffca2ee6",
+       "0b2bb9c79b7529954c14d1e5a0f98e8ae66b05e3",
        []
       ],
       "setup.py": [
-       "3e413f2a933aed7deebb39f7c5d33a6755cd76ab",
+       "f84c12849672d527a80dfb5d5dc057460c418b21",
        []
       ],
       "tox.ini": [
-       "e07ef670cef9848a7b1dc4b76b571bf3995ab216",
+       "58758cea13c370a23f18dc7158d6c3f447b6295b",
        []
       ],
       "utils": {
        "entities.py": [
-        "6dccf5f0bfd0025566426c314096e67e568359be",
+        "6e8ca4580604825370bb4fdd5831449481a6b6a4",
         []
        ]
       }
@@ -353611,7 +353883,7 @@
       ]
      },
      "requirements.txt": [
-      "d1d733b86b21cc17978a08b1715d6917e3d3b747",
+      "8ac1d9f78b058115e67d929a98cd7b6dd50099c4",
       []
      ],
      "requirements_android_webview.txt": [
@@ -355302,6 +355574,72 @@
       "572db0c01b620dd317f2079df6d0ea7cff6333fe",
       []
      ],
+     "functions": {
+      "helper.js": [
+       "487791c69ad43043985e38ae7ea37d540695fde4",
+       []
+      ],
+      "resources": {
+       "README.md": [
+        "a89258a4e01267a27ff25e559d69a1a85f0c314e",
+        []
+       ],
+       "current": {
+        "current.html": [
+         "63d9c437fc56833786c4e309cd8a3080c46c5564",
+         []
+        ],
+        "resources": {
+         "window-to-open.html": [
+          "1bc4cca9a3920f903008748e3a1e121b9163823b",
+          []
+         ]
+        }
+       },
+       "entry-incumbent.html": [
+        "6b210563e99bc22e2581904affefe1a640b0e8a4",
+        []
+       ],
+       "function": {
+        "function.html": [
+         "979b902eaa0e173ccb87be418ca408e4b0199c55",
+         []
+        ],
+        "resources": {
+         "window-to-open.html": [
+          "3928c1f8aa9e96ed83b37ce141c0ec4d034d3510",
+          []
+         ]
+        }
+       },
+       "incumbent-incumbent.html": [
+        "5e84f65a084e685e071792fb0e0c405c63142e8e",
+        []
+       ],
+       "relevant": {
+        "relevant.html": [
+         "06df91c23741f517fd6a88662f5866cd51531221",
+         []
+        ],
+        "resources": {
+         "window-to-open.html": [
+          "4138b5a084409da5673b86e1db29cac3ebdad2eb",
+          []
+         ]
+        }
+       },
+       "resources": {
+        "window-to-open.html": [
+         "7743b9b578201e8b6be7ded139af339afa20531e",
+         []
+        ]
+       },
+       "window-to-open.html": [
+        "ce357937f5e4f9895206ba7cf58dd5d6e5aa2c35",
+        []
+       ]
+      }
+     },
      "instanceTestFactory.js": [
       "86f593f46f8c6c159ce2f5a6bc39b0aa5b6eb189",
       []
@@ -355319,7 +355657,7 @@
       ]
      },
      "wasm-module-builder.js": [
-      "82c6e04135f1b86df1a1d8e72c5f829c3297bb10",
+      "25fb1c836b05e28a1e692dd31dd6061979483b1f",
       []
      ]
     },
@@ -452886,7 +453224,7 @@
     "cross-origin-opener-policy": {
      "access-reporting": {
       "openee-accessed_openee-coop-ro.https.html": [
-       "7385550222abb152daa0f3bf3410278dc486977a",
+       "5d4bb06453b8035db887806a23ed42cda62d6297",
        [
         null,
         {
@@ -452895,7 +453233,25 @@
        ]
       ],
       "openee-accessed_openee-coop.https.html": [
-       "2c94253bcecb7c64b0ad56e285db4a739bc9d44a",
+       "0b68205672b7aa5a90820eaa5472cd6d2ae36bae",
+       [
+        null,
+        {
+         "timeout": "long"
+        }
+       ]
+      ],
+      "openee-accessed_opener-coop-ro.https.html": [
+       "b40aa9505fea5ee7b55f790944390cdeda171f22",
+       [
+        null,
+        {
+         "timeout": "long"
+        }
+       ]
+      ],
+      "openee-accessed_opener-coop.https.html": [
+       "e70e5310a5a852ea3659b29edc1e20d5d8824889",
        [
         null,
         {
@@ -452904,7 +453260,7 @@
        ]
       ],
       "opener-accessed_openee-coop-ro.https.html": [
-       "8d07e27bb7c7e4c6e78190605d7eb5f3d07eaf76",
+       "4c3259ed570301683a99c0b2696619453720f1d4",
        [
         null,
         {
@@ -452913,7 +453269,25 @@
        ]
       ],
       "opener-accessed_openee-coop.https.html": [
-       "ae5bea87680f668439b775badcda3d20a1d51341",
+       "03dd9d86c54e4badbd36d040301230f281ec37ac",
+       [
+        null,
+        {
+         "timeout": "long"
+        }
+       ]
+      ],
+      "opener-accessed_opener-coop-ro.https.html": [
+       "5b72e569ce59ba1d73b3852576666ab6308766f4",
+       [
+        null,
+        {
+         "timeout": "long"
+        }
+       ]
+      ],
+      "opener-accessed_opener-coop.https.html": [
+       "1729f601e126726ebb7d719541b0353f0d203834",
        [
         null,
         {
@@ -465260,6 +465634,13 @@
           {}
          ]
         ],
+        "nested-imports.html": [
+         "23bb595d0ebce1fbe14a3b72ce34fc1efa2720fe",
+         [
+          null,
+          {}
+         ]
+        ],
         "nomodule-attribute.html": [
          "656c99b292ac03f401eead1c4798666de61ca91a",
          [
@@ -472299,6 +472680,13 @@
       {}
      ]
     ],
+    "image-removed-before-load.html": [
+     "b4e92b4e9a5c8aaa24a590ad272eda6c14c15bf8",
+     [
+      null,
+      {}
+     ]
+    ],
     "image-src-change.html": [
      "bd78476390c8c9df170bdd59211bb3756142e9aa",
      [
@@ -473722,14 +474110,14 @@
        ]
       ],
       "dynamic-childlist-001.html": [
-       "8098c720fea39ab47ad08489aa5ebf7a32aa1930",
+       "1d49169037fbcb6a94485b2c65be8c427c7c4767",
        [
         null,
         {}
        ]
       ],
       "dynamic-childlist-002.html": [
-       "d874e80bbba6cccb88fe5e79c51af72b087d75e3",
+       "f722512f7259522a2c77f4ae7f985a85bd5b10e8",
        [
         null,
         {}
@@ -477052,7 +477440,7 @@
      ]
     ],
     "opaque-origin.https.window.js": [
-     "265514760b691b4032123fd058dc2a9221f135b7",
+     "a916592406e721ed16980236114a5eac266fc0bf",
      [
       "native-file-system/opaque-origin.https.window.html",
       {}
@@ -477868,6 +478256,20 @@
        ]
       }
      ]
+    ],
+    "showPicker-errors.https.window.js": [
+     "1f1d2edd63d0850622ff3260addfa1270a70084f",
+     [
+      "native-file-system/showPicker-errors.https.window.html",
+      {
+       "script_metadata": [
+        [
+         "script",
+         "resources/test-helpers.js"
+        ]
+       ]
+      }
+     ]
     ]
    },
    "native-io": {
@@ -483139,6 +483541,13 @@
       {}
      ]
     ],
+    "preload-link-cached-stylesheet-different-doc.html": [
+     "8df1383fccd45728428b38e496400910772b36c6",
+     [
+      null,
+      {}
+     ]
+    ],
     "preload-strict-dynamic.html": [
      "76395656f9b359e05ae1aeace5ad05a6f338cb5e",
      [
@@ -494950,7 +495359,7 @@
      ]
     ],
     "getScreens.values.https.html": [
-     "3d70a7c81cf6548f28dbe8fbfb7c438901e03060",
+     "3b8060786e13fc1c11f9b54b4c3e927ecab1e43b",
      [
       null,
       {}
@@ -496902,7 +497311,7 @@
       ]
      ],
      "fetch-event.https.html": [
-      "169a0b17d6230335fb0c83988039875c815d99e1",
+      "48f71e46cb22136958f63aedd3ff16758a5de581",
       [
        null,
        {
@@ -500062,7 +500471,7 @@
    },
    "streams": {
     "idlharness.any.js": [
-     "e9f085bfc0e11ba5a3952474a338b3b916670aa9",
+     "42a17da58c5ae390234ee394303aa2fe6a72ebdd",
      [
       "streams/idlharness.any.html",
       {
@@ -511785,6 +512194,29 @@
        ]
       ]
      },
+     "functions": {
+      "entry-different-function-realm.html": [
+       "3af3dd924fb435e8cdcd4bb19f01948b77318dbf",
+       [
+        null,
+        {}
+       ]
+      ],
+      "entry.html": [
+       "15018074491054dcb9e2f95c0d9c9d1691c9161a",
+       [
+        null,
+        {}
+       ]
+      ],
+      "incumbent.html": [
+       "cb2763297709a8ecdddd8541d2b332577102cd35",
+       [
+        null,
+        {}
+       ]
+      ]
+     },
      "global": {
       "constructor.any.js": [
        "f536f5d7b5df6c91d74b17f9512abfebe8ac9b35",
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
index 4a1e8110f6f..f8e7e539aae 100644
--- a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,3 +2,6 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
+  [Hit test within unscaled box]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index d080f72a962..a6c39d50087 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -8,6 +8,3 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
-  [doesn't look up handleEvent method on callable event listeners]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
index 85e94926cb3..5733d536fd3 100644
--- a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
@@ -21,3 +21,6 @@
   [test the top of layer]
     expected: FAIL
 
+  [test some point of the element: top left corner]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini
new file mode 100644
index 00000000000..239c35135e4
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini
@@ -0,0 +1,7 @@
+[offsetTopLeft-border-box.html]
+  [container: 1]
+    expected: FAIL
+
+  [container: 0]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 3901d35aedd..f071f266199 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,24 +312,21 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/plain */*]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index e67f0406fc3..d2df9b78483 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,3 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
+  [separate text/javascript x/x]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 30e1b851fd4..fb0ce3ea7db 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,9 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20%22nosniFF%22]
+    expected: FAIL
+
+  [X-Content-Type-Options%3A%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini b/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
new file mode 100644
index 00000000000..735a9a75a2a
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
@@ -0,0 +1,2 @@
+[cross-origin-objects-on-new-window.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
index c757b400205..442db3cb549 100644
--- a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,5 +1,4 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
   [opener and "removed" embedded documents]
     expected: FAIL
 
@@ -7,5 +6,5 @@
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/elements/the-innertext-idl-attribute/getter.html.ini b/tests/wpt/metadata/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
index 6bbf5c59047..6bf603a188b 100644
--- a/tests/wpt/metadata/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
+++ b/tests/wpt/metadata/html/dom/elements/the-innertext-idl-attribute/getter.html.ini
@@ -323,3 +323,6 @@
   [Whitespace collapses across element boundaries at soft break (3) ("<div style='width:1px; word-break:break-word'><x>Hello </x><x> Kitty</x></div>")]
     expected: FAIL
 
+  [<svg> text contents preserved ("<div><svg><text>abc</text></svg></div>")]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 2a166bb97b7..f42f518d257 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_escaping-1.html]
   type: testharness
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index daa518bd0e3..c6f45be1eb2 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index f6a7aca3306..cb0211f1d21 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
new file mode 100644
index 00000000000..633a99517d3
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-2.html]
+  [preventDefault should allow onclick submit() to succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 01f7b72cbe7..0cef5158fae 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -4,6 +4,3 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
-  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 5ddb9bfeff6..a1effd5f801 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/wasm/jsapi/functions/entry-different-function-realm.html.ini b/tests/wpt/metadata/wasm/jsapi/functions/entry-different-function-realm.html.ini
new file mode 100644
index 00000000000..20f3693b573
--- /dev/null
+++ b/tests/wpt/metadata/wasm/jsapi/functions/entry-different-function-realm.html.ini
@@ -0,0 +1,5 @@
+[entry-different-function-realm.html]
+  expected: ERROR
+  [Start function]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/wasm/jsapi/functions/entry.html.ini b/tests/wpt/metadata/wasm/jsapi/functions/entry.html.ini
new file mode 100644
index 00000000000..0f5d2ac06e5
--- /dev/null
+++ b/tests/wpt/metadata/wasm/jsapi/functions/entry.html.ini
@@ -0,0 +1,7 @@
+[entry.html]
+  [Start function]
+    expected: FAIL
+
+  [Sanity check: this all works as expected synchronously]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/jsapi/functions/incumbent.html.ini b/tests/wpt/metadata/wasm/jsapi/functions/incumbent.html.ini
new file mode 100644
index 00000000000..2b603de3c95
--- /dev/null
+++ b/tests/wpt/metadata/wasm/jsapi/functions/incumbent.html.ini
@@ -0,0 +1,5 @@
+[incumbent.html]
+  expected: TIMEOUT
+  [Start function]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/webmessaging/without-ports/018.html.ini b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
deleted file mode 100644
index 663a1f8fa30..00000000000
--- a/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
index 49f489d2a1c..d6e39444229 100644
--- a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
+++ b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
@@ -1,6 +1,5 @@
 [003.html]
   type: testharness
-  expected: ERROR
   [shared]
     expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/background-image-007.html b/tests/wpt/web-platform-tests/css/css-backgrounds/background-image-007.html
index 388b221e833..9bccd2d364a 100644
--- a/tests/wpt/web-platform-tests/css/css-backgrounds/background-image-007.html
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/background-image-007.html
@@ -1,31 +1,43 @@
 <!DOCTYPE html>
-<title>CSS Backgrounds: background-image :first-letter layered images</title>
-<link rel="author" title="Justin Hill" href="http://www.justin-hill.com">
-<link rel="help" href="http://www.w3.org/TR/css3-background/#the-background-image">
-<link rel="match" href="reference/background-image-001-ref.html">
-<meta name="assert" content="Test checks that background-image displays multiple images in correct order on :first-letter selector.">
-<style>
-    .container {
-      top:50px;
-      left:50px;
-      width: 100px;
-      height: 100px;
+
+  <meta charset="UTF-8">
+
+  <title>CSS Backgrounds and Borders Test: ::first-letter with multiple background images</title>
+
+  <link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="author" title="Justin Hill" href="http://www.justin-hill.com">
+  <link rel="help" href="http://www.w3.org/TR/css3-background/#the-background-image">
+  <link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#first-letter-styling">
+  <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+
+  <!--
+
+  More information:
+
+  https://github.com/web-platform-tests/wpt/issues/22261
+
+  -->
+
+  <meta name="assert" content="This test checks that 'background-image' applies to ::first-letter pseudo-element and that, in case of multiple background images, the first specified one must be on top (closest to the user).">
+
+  <style>
+  div
+    {
+      color: transparent;
+      /* So that background shines through both "A" and "Z" glyphs */
+      line-height: 1;
     }
 
-    .container p:first-letter {
-      width:100px;
-      height:100px;
-      color:transparent;
-      font-size: 50px;
-      background-image: url("support/green.png"), url("support/red.png");
+  div::first-letter
+    {
       background-color: red;
-      display: block;
-      margin: 0px;
+      background-image: url("support/1x1-green.png"), url("../support/60x60-red.png");
+      font-family: Ahem;
+      font-size: 100px;
     }
-</style>
-<body>
-    <p> Test passes if green image shows and no red visable.</p>
-    <div class="container">
-      <p>x</p>
-    </div>
-</body>
+  </style>
+
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.
+
+  <div>AZ</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-005.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-005.tentative.html
new file mode 100644
index 00000000000..697e773be1d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-005.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: min-content size contribution in an orthogonal flow</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: min-content; height: 100px; background: green;">
+  <div style="height: 100px; aspect-ratio: 1/1; writing-mode: vertical-lr;"></div>
+</div>
+
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-006.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-006.tentative.html
new file mode 100644
index 00000000000..fa736e92267
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-006.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: min-content size contribution with percentage block size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: min-content; height: 100px; background: green;">
+  <div style="height: 100%;">
+    <div style="height: 100%; aspect-ratio: 1/1;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-007.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-007.tentative.html
new file mode 100644
index 00000000000..6310bf4269a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-007.tentative.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: min-content size contribution with indefinite percentage block size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: min-content; background: green;">
+  <!-- Indefinite height here - we should "fall through" to the
+       inner div and calculate 100px, instead of treating 100% as 0. -->
+  <div style="height: 100%; aspect-ratio: 1/1;">
+    <div style="width: 100px; height: 100px;"></div>
+  </div>
+</div>
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-008.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-008.tentative.html
new file mode 100644
index 00000000000..7ef0d6262bb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/intrinsic-size-008.tentative.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: min-content size contribution with percentage block size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div id="target" style="width: min-content; height: 200px; background: green;">
+  <div style="height: 100%;">
+    <div style="height: 100%; aspect-ratio: 1/1;"></div>
+  </div>
+</div>
+
+<script>
+document.body.offsetTop;
+document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-thickness-nesting-manual.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-thickness-nesting-manual.html
new file mode 100644
index 00000000000..b436761bc54
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-thickness-nesting-manual.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+      <title>CSS Text Decoration Test: Thickness on decorating element</title>
+      <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#text-decoration-width-property"/>
+      <meta name="assert" content="text-decoration-thickness affects all decorations originating from this element."/>
+      <link rel="author" title="Dominik Röttsches" href="mailto:drott@chromium.org"/>
+      <style>
+.test {
+font-size: 32px;
+}
+
+.underline {
+text-decoration: underline;
+text-underline-position: from-font;
+}
+
+.thickness_outer_9 {
+text-decoration-thickness: 90px;
+text-decoration-color: #ff3366;
+}
+.thickness_outer_8 {
+text-decoration-thickness: 80px;
+text-decoration-color: #ff6633;
+}
+
+.thickness_outer_7 {
+text-decoration-thickness: 70px;
+text-decoration-color: #FFCC33;
+}
+
+.thickness_outer_6 {
+text-decoration-thickness: 60px;
+text-decoration-color: #33FF66;
+}
+
+.thickness_outer_5 {
+text-decoration-thickness: 50px;
+text-decoration-color: #33FFCC;
+}
+
+.thickness_outer_4 {
+text-decoration-thickness: 40px;
+text-decoration-color: #33CCFF;
+}
+
+.thickness_outer_3 {
+text-decoration-thickness: 30px;
+text-decoration-color: #3366FF;
+}
+
+.thickness_outer_2 {
+text-decoration-thickness: 20px;
+text-decoration-color: #6633FF;
+}
+
+.thickness_outer_1 {
+text-decoration-thickness: 10px;
+text-decoration-color: #CC33FF;
+}
+</style>
+    </head>
+    <body>
+      <p>Test passes if a rainbow pattern is seen in equal portions horizontally from left to right and vertically on the
+right side, with L shaped segments of underline for each color.</p>
+      <div class="test">
+        <span class="underline thickness_outer_9">X<span class="underline thickness_outer_8">X<span class="underline thickness_outer_7">X<span class="underline thickness_outer_6">X<span class="underline thickness_outer_5">X<span class="underline thickness_outer_4">X<span class="underline thickness_outer_3">X<span class="underline thickness_outer_2">X<span class="underline thickness_outer_1">X</span></span>
+                    </span>
+                  </span>
+                </span>
+              </span>
+            </span>
+          </span>
+        </span>
+      </div>
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/requirements.txt b/tests/wpt/web-platform-tests/css/requirements.txt
index b54096f2d66..a008e3e72e8 100644
--- a/tests/wpt/web-platform-tests/css/requirements.txt
+++ b/tests/wpt/web-platform-tests/css/requirements.txt
@@ -1,5 +1,5 @@
 Template-Python==0.1.post1
-html5lib==1.0.1
+html5lib==1.1
 lxml==4.1.1
 mercurial==4.5
 six==1.15.0
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop-ro.https.html
index 7385550222a..5d4bb06453b 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop-ro.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop-ro.https.html
@@ -58,33 +58,21 @@ operation.forEach(([property, op]) => {
     let reply = await receive(callback_token);
     assert_equals(reply, "Ready");
 
-    // 2. Skip the first report about the opener breakage.
-    let report_1 = await receive(report_token);
-    assert_not_equals(report_1, "timeout",
-      "Receive navigation-to-document report");
-    report_1 = JSON.parse(report_1);
-    assert_equals(report_1.length, 1);
-    assert_equals(report_1[0].type, "coop");
-    assert_equals(report_1[0].body["violation-type"], "navigation-to-document");
-    assert_equals(report_1[0].body["disposition"], "reporting");
-
-    // 3. Try to access the openee. A report is sent, because of COOP-RO+COEP.
+    // 2. Try to access the openee. A report is sent, because of COOP-RO+COEP.
     try {op(openee)} catch(e) {}
 
-    // 4. A COOP access reports must be sent as a result of (3).
-    let report_2 = await receive(report_token);
-    assert_not_equals(report_2, "timeout", "Receive access report");
-    report_2 = JSON.parse(report_2);
-    assert_equals(report_2.length, 1);
-    assert_equals(report_2[0].type, "coop");
-    assert_equals(report_2[0].url, openee_url.replace(/"/g, '%22'));
-    assert_equals(report_2[0].body["violation-type"], "access-to-coop-page");
-    assert_equals(report_2[0].body["disposition"], "reporting");
-    assert_equals(report_2[0].body["effective-policy"], "same-origin-plus-coep");
-    assert_equals(report_2[0].body["property"], property);
-    assert_equals(report_2[0].body["source-file"], undefined);
-    assert_equals(report_2[0].body["lineno"], undefined);
-    assert_equals(report_2[0].body["colno"], undefined);
+    // 3. Check a report is sent to the openee.
+    let report = await receiveReport(report_token, "access-to-coop-page")
+    assert_not_equals(report, "timeout", "Report not received");
+    assert_equals(report.type, "coop");
+    assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+    assert_equals(report.body["violation-type"], "access-to-coop-page");
+    assert_equals(report.body["disposition"], "reporting");
+    assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+    assert_equals(report.body["property"], property);
+    assert_equals(report.body["source-file"], undefined);
+    assert_equals(report.body["lineno"], undefined);
+    assert_equals(report.body["colno"], undefined);
     // TODO(arthursonzogni): Add check for report > body > blocked-window-url
   }, `${op}`);
 });
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop.https.html
index 2c94253bcec..0b68205672b 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_openee-coop.https.html
@@ -58,33 +58,21 @@ operation.forEach(([property, op]) => {
     let reply = await receive(callback_token);
     assert_equals(reply, "Ready");
 
-    // 2. Skip the first report about the opener breakage.
-    let report_1 = await receive(report_token);
-    assert_not_equals(report_1, "timeout",
-      "Receive navigation-to-document report");
-    report_1 = JSON.parse(report_1);
-    assert_equals(report_1.length, 1);
-    assert_equals(report_1[0].type, "coop");
-    assert_equals(report_1[0].body["violation-type"], "navigation-to-document");
-    assert_equals(report_1[0].body["disposition"], "enforce");
-
-    // 3. Try to access the openee. This shouldn't work because of COOP+COEP.
+    // 2. Try to access the openee. This shouldn't work because of COOP+COEP.
     try {op(openee)} catch(e) {}
 
-    // 4. A COOP access reports must be sent as a result of (3).
-    let report_2 = await receive(report_token);
-    assert_not_equals(report_2, "timeout", "Receive access report");
-    report_2 = JSON.parse(report_2);
-    assert_equals(report_2.length, 1);
-    assert_equals(report_2[0].type, "coop");
-    assert_equals(report_2[0].url, openee_url.replace(/"/g, '%22'));
-    assert_equals(report_2[0].body["violation-type"], "access-to-coop-page");
-    assert_equals(report_2[0].body["disposition"], "enforce");
-    assert_equals(report_2[0].body["effective-policy"], "same-origin-plus-coep");
-    assert_equals(report_2[0].body["property"], property);
-    assert_equals(report_2[0].body["source-file"], undefined);
-    assert_equals(report_2[0].body["lineno"], undefined);
-    assert_equals(report_2[0].body["colno"], undefined);
+    // 3. Check a report is sent to the openee.
+    let report = await receiveReport(report_token, "access-to-coop-page")
+    assert_not_equals(report, "timeout", "Report not received");
+    assert_equals(report.type, "coop");
+    assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+    assert_equals(report.body["violation-type"], "access-to-coop-page");
+    assert_equals(report.body["disposition"], "enforce");
+    assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+    assert_equals(report.body["property"], property);
+    assert_equals(report.body["source-file"], undefined);
+    assert_equals(report.body["lineno"], undefined);
+    assert_equals(report.body["colno"], undefined);
     // TODO(arthursonzogni): Add check for report > body > blocked-window-url
 
   }, `${op}`);
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop-ro.https.html
new file mode 100644
index 00000000000..b40aa9505fe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop-ro.https.html
@@ -0,0 +1,74 @@
+<title>
+  COOP reports are to the opener when the opener used COOP-RO+COEP and then it
+  tries to access a cross-origin openee.
+</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="./resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/access-reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+const same_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const cross_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
+
+promise_test(async t => {
+  // The test window.
+  const this_window_token = token();
+
+  // The "opener" window. This has COOP and a reporter.
+  const opener_report_token= token();
+  const opener_token = token();
+  const opener_reportTo = reportToHeaders(opener_report_token);
+  const opener_url = same_origin + executor_path + opener_reportTo.header +
+    opener_reportTo.coopReportOnlySameOriginHeader + coep_header +
+    `&uuid=${opener_token}`;
+
+  // The "openee" window. This is cross origin with the "opener".
+  const openee_report_token= token();
+  const openee_token = token();
+  const openee_url = same_origin + executor_path + `&uuid=${openee_token}`;
+
+  // 1. Create the opener window.
+  let opener_window_proxy = window.open(opener_url);
+  t.add_cleanup(() => send(opener_token, "window.close()"));
+
+  // 2. The opener opens it openee.
+  send(opener_token, `
+    let openee = window.open("${openee_url}");
+    send("${this_window_token}", "ACK 1");
+  `);
+  assert_equals("ACK 1", await receive(this_window_token));
+  t.add_cleanup(() => send(openee_token, "window.close()"));
+
+  // 3. Ensure the openee's document to be loaded.
+  send(openee_token, `
+    send("${this_window_token}", "ACK 2");
+  `);
+  assert_equals("ACK 2", await receive(this_window_token));
+
+  // 4. The opener tries to access its openee.
+  send(opener_token, `
+    try {openee.blur()} catch(e) {}
+  `);
+
+  // 5. Check a report sent to the opener.
+  let report = await receiveReport(opener_report_token, "access-from-coop-page")
+  assert_not_equals(report, "timeout", "Report not received");
+  assert_equals(report.type, "coop");
+  assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+  assert_equals(report.body["violation-type"], "access-from-coop-page");
+  assert_equals(report.body["disposition"], "reporting");
+  assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+  assert_equals(report.body["property"], "blur");
+  assert_equals(report.body["source-file"], undefined);
+  assert_equals(report.body["lineno"], undefined);
+  assert_equals(report.body["colno"], undefined);
+  // TODO(arthursonzogni): Check the window-blocked-url.
+}, "Opener (COOP-RO+COEP) access cross origin openee");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop.https.html
new file mode 100644
index 00000000000..e70e5310a5a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/openee-accessed_opener-coop.https.html
@@ -0,0 +1,74 @@
+<title>
+  COOP reports are to the opener when the opener used COOP+COEP and then it
+  tries to access a cross-origin openee.
+</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="./resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/access-reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+const same_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const cross_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
+
+promise_test(async t => {
+  // The test window.
+  const this_window_token = token();
+
+  // The "opener" window. This has COOP and a reporter.
+  const opener_report_token= token();
+  const opener_token = token();
+  const opener_reportTo = reportToHeaders(opener_report_token);
+  const opener_url = same_origin + executor_path + opener_reportTo.header +
+    opener_reportTo.coopSameOriginHeader + coep_header +
+    `&uuid=${opener_token}`;
+
+  // The "openee" window. This is cross origin with the "opener".
+  const openee_report_token= token();
+  const openee_token = token();
+  const openee_url = same_origin + executor_path + `&uuid=${openee_token}`;
+
+  // 1. Create the opener window.
+  let opener_window_proxy = window.open(opener_url);
+  t.add_cleanup(() => send(opener_token, "window.close()"));
+
+  // 2. The opener opens it openee.
+  send(opener_token, `
+    let openee = window.open("${openee_url}");
+    send("${this_window_token}", "ACK 1");
+  `);
+  assert_equals("ACK 1", await receive(this_window_token));
+  t.add_cleanup(() => send(openee_token, "window.close()"));
+
+  // 3. Ensure the openee's document to be loaded.
+  send(openee_token, `
+    send("${this_window_token}", "ACK 2");
+  `);
+  assert_equals("ACK 2", await receive(this_window_token));
+
+  // 4. The opener tries to access its openee.
+  send(opener_token, `
+    try {openee.blur()} catch(e) {}
+  `);
+
+  // 5. Check a report sent to the opener.
+  let report = await receiveReport(opener_report_token, "access-from-coop-page")
+  assert_not_equals(report, "timeout", "Report not received");
+  assert_equals(report.type, "coop");
+  assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+  assert_equals(report.body["violation-type"], "access-from-coop-page");
+  assert_equals(report.body["disposition"], "enforce");
+  assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+  assert_equals(report.body["property"], "blur");
+  assert_equals(report.body["source-file"], undefined);
+  assert_equals(report.body["lineno"], undefined);
+  assert_equals(report.body["colno"], undefined);
+  // TODO(arthursonzogni): Check the window-blocked-url.
+}, "Opener (COOP+COEP) access cross origin openee");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop-ro.https.html
index 8d07e27bb7c..4c3259ed570 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop-ro.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop-ro.https.html
@@ -64,26 +64,20 @@ operation.forEach(([property, op]) => {
     // 3. Try to access the opener. A report is sent, because of COOP-RO+COEP.
     send(executor_token, `
       try {${op}} catch(e) {}
-      send("${callback_token}", "Done");
     `);
-    let reply = await receive(callback_token);
-    assert_equals(reply, "Done");
 
-    // 4. A COOP access reports must be sent as a result of (3).
-    let report_2 = await receive(report_token);
-    assert_not_equals(report_2, "timeout", "Receive access report");
-    report_2 = JSON.parse(report_2);
-
-    assert_equals(report_2.length, 1);
-    assert_equals(report_2[0].type, "coop");
-    assert_equals(report_2[0].url, openee_url.replace(/"/g, '%22'));
-    assert_equals(report_2[0].body["violation-type"], "access-from-coop-page");
-    assert_equals(report_2[0].body["disposition"], "reporting");
-    assert_equals(report_2[0].body["effective-policy"], "same-origin-plus-coep");
-    assert_equals(report_2[0].body["property"], property);
-    assert_equals(report_2[0].body["source-file"], undefined);
-    assert_equals(report_2[0].body["lineno"], undefined);
-    assert_equals(report_2[0].body["colno"], undefined);
+    // 3. Check a report is sent to the openee.
+    let report = await receiveReport(report_token, "access-from-coop-page")
+    assert_not_equals(report, "timeout", "Report not received");
+    assert_equals(report.type, "coop");
+    assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+    assert_equals(report.body["violation-type"], "access-from-coop-page");
+    assert_equals(report.body["disposition"], "reporting");
+    assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+    assert_equals(report.body["property"], property);
+    assert_equals(report.body["source-file"], undefined);
+    assert_equals(report.body["lineno"], undefined);
+    assert_equals(report.body["colno"], undefined);
   }, `${op})`);
 });
 
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop.https.html
index ae5bea87680..03dd9d86c54 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_openee-coop.https.html
@@ -51,39 +51,23 @@ operation.forEach(([property, op]) => {
     const openee = window.open(openee_url);
     t.add_cleanup(() => send(executor_token, "window.close()"));
 
-    // 1. Skip the first report about the opener breakage.
-    let report_1 = await receive(report_token);
-    assert_not_equals(report_1, "timeout",
-      "Receive navigation-to-document report");
-    report_1 = JSON.parse(report_1);
-    assert_equals(report_1.length, 1);
-    assert_equals(report_1[0].type, "coop");
-    assert_equals(report_1[0].body["violation-type"], "navigation-to-document");
-    assert_equals(report_1[0].body["disposition"], "enforce");
-
-    // 3. Try to access the opener. A report is sent, because of COOP+COEP.
+    // 2. Try to access the opener. A report is sent, because of COOP+COEP.
     send(executor_token, `
       try {${op}} catch(e) {}
-      send("${callback_token}", "Done");
     `);
-    let reply = await receive(callback_token);
-    assert_equals(reply, "Done");
 
-    // 4. A COOP access reports must be sent as a result of (3).
-    let report_2 = await receive(report_token);
-    assert_not_equals(report_2, "timeout", "Received access report");
-    report_2 = JSON.parse(report_2);
-
-    assert_equals(report_2.length, 1);
-    assert_equals(report_2[0].type, "coop");
-    assert_equals(report_2[0].url, openee_url.replace(/"/g, '%22'));
-    assert_equals(report_2[0].body["violation-type"], "access-from-coop-page");
-    assert_equals(report_2[0].body["disposition"], "enforce");
-    assert_equals(report_2[0].body["effective-policy"], "same-origin-plus-coep");
-    assert_equals(report_2[0].body["property"], property);
-    assert_equals(report_2[0].body["source-file"], undefined);
-    assert_equals(report_2[0].body["lineno"], undefined);
-    assert_equals(report_2[0].body["colno"], undefined);
+    // 3. Check a report is sent to the openee.
+    let report = await receiveReport(report_token, "access-from-coop-page")
+    assert_not_equals(report, "timeout", "Report not received");
+    assert_equals(report.type, "coop");
+    assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+    assert_equals(report.body["violation-type"], "access-from-coop-page");
+    assert_equals(report.body["disposition"], "enforce");
+    assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+    assert_equals(report.body["property"], property);
+    assert_equals(report.body["source-file"], undefined);
+    assert_equals(report.body["lineno"], undefined);
+    assert_equals(report.body["colno"], undefined);
   }, `${op}`);
 });
 
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop-ro.https.html
new file mode 100644
index 00000000000..5b72e569ce5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop-ro.https.html
@@ -0,0 +1,70 @@
+<title>
+  COOP reports are to the opener when the opener used COOP-RO+COEP and then its
+  cross-origin openee tries to access it.
+</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="./resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/access-reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+const same_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const cross_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
+
+promise_test(async t => {
+  // The test window.
+  const this_window_token = token();
+
+  // The "opener" window. This has COOP and a reporter.
+  const opener_report_token= token();
+  const opener_token = token();
+  const opener_reportTo = reportToHeaders(opener_report_token);
+  const opener_url = same_origin + executor_path + opener_reportTo.header +
+    opener_reportTo.coopReportOnlySameOriginHeader + coep_header +
+    `&uuid=${opener_token}`;
+
+  // The "openee" window. This is cross origin with the "opener".
+  const openee_report_token= token();
+  const openee_token = token();
+  const openee_url = same_origin + executor_path + `&uuid=${openee_token}`;
+
+  // 1. Create the opener window.
+  let opener_window_proxy = window.open(opener_url);
+  t.add_cleanup(() => send(opener_token, "window.close()"));
+
+  // 2. The opener opens its openee.
+  send(opener_token, `
+    let openee = window.open("${openee_url}");
+    send("${this_window_token}", "ACK 1");
+  `);
+  assert_equals("ACK 1", await receive(this_window_token));
+  t.add_cleanup(() => send(openee_token, "window.close()"));
+
+  // 3. The openee tries to access its opener.
+  send(openee_token, `
+    try {opener.blur()} catch(e) {}
+    send("${this_window_token}", "ACK 3");
+  `);
+  assert_equals("ACK 3", await receive(this_window_token));
+
+  // 4. Check a report sent to the opener.
+  let report = await receiveReport(opener_report_token, "access-to-coop-page")
+  assert_not_equals(report, "timeout", "Report not received");
+  assert_equals(report.type, "coop");
+  assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+  assert_equals(report.body["violation-type"], "access-to-coop-page");
+  assert_equals(report.body["disposition"], "reporting");
+  assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+  assert_equals(report.body["property"], "blur");
+  assert_equals(report.body["source-file"], undefined);
+  assert_equals(report.body["lineno"], undefined);
+  assert_equals(report.body["colno"], undefined);
+  // TODO(arthursonzogni): Check the window-blocked-url.
+}, "Opener (COOP-RO+COEP) accessed by cross origin openee");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop.https.html
new file mode 100644
index 00000000000..1729f601e12
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/opener-accessed_opener-coop.https.html
@@ -0,0 +1,68 @@
+<title>
+  COOP reports are to the opener when the opener used COOP+COEP and then its
+  cross-origin openee tries to access it.
+</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="./resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/access-reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+const same_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const cross_origin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
+
+promise_test(async t => {
+  // The test window.
+  const this_window_token = token();
+
+  // The "opener" window. This has COOP and a reporter.
+  const opener_report_token= token();
+  const opener_token = token();
+  const opener_reportTo = reportToHeaders(opener_report_token);
+  const opener_url = same_origin + executor_path + opener_reportTo.header +
+    opener_reportTo.coopSameOriginHeader + coep_header +
+    `&uuid=${opener_token}`;
+
+  // The "openee" window. This is cross origin with the "opener".
+  const openee_report_token= token();
+  const openee_token = token();
+  const openee_url = same_origin + executor_path + `&uuid=${openee_token}`;
+
+  // 1. Create the opener window.
+  let opener_window_proxy = window.open(opener_url);
+  t.add_cleanup(() => send(opener_token, "window.close()"));
+
+  // 2. The opener opens its openee.
+  send(opener_token, `
+    let openee = window.open("${openee_url}");
+    send("${this_window_token}", "ACK 1");
+  `);
+  assert_equals("ACK 1", await receive(this_window_token));
+  t.add_cleanup(() => send(openee_token, "window.close()"));
+
+  // 3. The openee tries to access its opener.
+  send(openee_token, `
+    try {opener.blur()} catch(e) {}
+  `);
+
+  // 4. Check a report is sent to the opener.
+  let report = await receiveReport(opener_report_token, "access-to-coop-page")
+  assert_not_equals(report, "timeout", "Report not received");
+  assert_equals(report.type, "coop");
+  assert_equals(report.url, openee_url.replace(/"/g, '%22'));
+  assert_equals(report.body["violation-type"], "access-to-coop-page");
+  assert_equals(report.body["disposition"], "enforce");
+  assert_equals(report.body["effective-policy"], "same-origin-plus-coep");
+  assert_equals(report.body["property"], "blur");
+  assert_equals(report.body["source-file"], undefined);
+  assert_equals(report.body["lineno"], undefined);
+  assert_equals(report.body["colno"], undefined);
+  // TODO(arthursonzogni): Check the window-blocked-url.
+}, "Opener (COOP+COEP) accessed by cross origin openee");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/resources/dispatcher.js b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/resources/dispatcher.js
index 53109400f80..8cd28a07179 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/resources/dispatcher.js
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/access-reporting/resources/dispatcher.js
@@ -30,6 +30,20 @@ const receive = async function(uuid) {
   return "timeout";
 }
 
+const receiveReport = async function(uuid, type) {
+  while(true) {
+    let reports = await receive(uuid);
+    if (reports == "timeout")
+      return "timeout";
+    reports = JSON.parse(reports);
+
+    for(report of reports) {
+      if (report?.["body"]?.["violation-type"] == type)
+        return report;
+    }
+  }
+}
+
 // Build a set of headers to tests the reporting API. This defines a set of
 // matching 'Report-To', 'Cross-Origin-Opener-Policy' and
 // 'Cross-Origin-Opener-Policy-Report-Only' headers.
diff --git a/tests/wpt/web-platform-tests/html/dom/elements/the-innertext-idl-attribute/getter-tests.js b/tests/wpt/web-platform-tests/html/dom/elements/the-innertext-idl-attribute/getter-tests.js
index 34f3b0fa9c6..fd32e8d69a3 100644
--- a/tests/wpt/web-platform-tests/html/dom/elements/the-innertext-idl-attribute/getter-tests.js
+++ b/tests/wpt/web-platform-tests/html/dom/elements/the-innertext-idl-attribute/getter-tests.js
@@ -175,6 +175,10 @@ testText("<canvas>abc", "", "<canvas> contents ignored");
 testText("<canvas><div id='target'>abc", "abc", "<canvas><div id='target'> contents ok for element not being rendered");
 testText("<img alt='abc'>", "", "<img> alt text ignored");
 testText("<img src='about:blank' class='poke'>", "", "<img> contents ignored");
+testText("<div><svg><text>abc</text></svg></div>", "abc", "<svg> text contents preserved");
+testText("<div><svg><defs><text>abc</text></defs></svg></div>", "", "<svg><defs> text contents ignored");
+testText("<div><svg><stop>abc</stop></svg></div>", "", "<svg> non-rendered text ignored");
+testText("<svg><foreignObject><span id='target'>abc</span></foreignObject></svg>", "abc", "<foreignObject> contents preserved");
 
 /**** <select>, <optgroup> & <option> ****/
 
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-a.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-a.js
new file mode 100644
index 00000000000..a127aeb559a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-a.js
@@ -0,0 +1 @@
+import { b } from "./nested-imports-b.js";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-b.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-b.js
new file mode 100644
index 00000000000..18a5af40cc0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-b.js
@@ -0,0 +1,2 @@
+import { c } from "./nested-imports-c.js";
+export const b = "b";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-c.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-c.js
new file mode 100644
index 00000000000..ec44596aeae
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-c.js
@@ -0,0 +1,2 @@
+import { d } from "./nested-imports-d.js";
+export const c = "c";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-d.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-d.js
new file mode 100644
index 00000000000..cee87849c62
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-d.js
@@ -0,0 +1,3 @@
+import { e } from "./nested-imports-e.js";
+import "./resources/delayed-modulescript.py";
+export const d = "d";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-e.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-e.js
new file mode 100644
index 00000000000..ec6f0360a60
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-e.js
@@ -0,0 +1,2 @@
+import { f } from "./nested-imports-f.js";
+export const e = "e";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-f.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-f.js
new file mode 100644
index 00000000000..0591e0b3166
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-f.js
@@ -0,0 +1,2 @@
+import { g } from "./nested-imports-g.js";
+export const f = "f";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-g.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-g.js
new file mode 100644
index 00000000000..86cbe7d3f8e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-g.js
@@ -0,0 +1,2 @@
+import { h } from "./nested-imports-h.js";
+export const g = "g";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-h.js b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-h.js
new file mode 100644
index 00000000000..a1612912599
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-h.js
@@ -0,0 +1,2 @@
+import { c } from "./nested-imports-c.js";
+export const h = "h";
diff --git a/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports.html b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports.html
new file mode 100644
index 00000000000..23bb595d0eb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Test imports under more than 3 levels in different modules</title>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  setup({ allow_uncaught_exception: true });
+
+  window.log = [];
+
+  const test_load = async_test("should load all modules successfully");
+  window.addEventListener(
+    "load",
+    test_load.step_func_done((ev) => {
+      assert_equals(log.length, 2);
+
+      assert_equals(log[0], 1);
+      assert_equals(log[1], 2);
+    })
+  );
+
+  function unreachable() {
+    log.push("unexpected");
+  }
+</script>
+<script type="module" src="./nested-imports-a.js" onerror="unreachable()"
+    onload="log.push(1)"></script>
+<script type="module" src="./nested-imports-e.js" onerror="unreachable()"
+  onload="log.push(2)"></script>
diff --git a/tests/wpt/web-platform-tests/largest-contentful-paint/image-removed-before-load.html b/tests/wpt/web-platform-tests/largest-contentful-paint/image-removed-before-load.html
new file mode 100644
index 00000000000..b4e92b4e9a5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/largest-contentful-paint/image-removed-before-load.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Largest Contentful Paint: largest image is reported.</title>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/largest-contentful-paint-helpers.js"></script>
+<img id="target"/>
+<img id="target2"/>
+<script>
+  const numInitial = 100;
+  const sleep = 1000;
+  const small_img_src = '/images/green-16x16.png';
+  let beforeLoad;
+  async_test(function (t) {
+    assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
+    const img_src = '/element-timing/resources/progressive-image.py?name=square20.jpg&numInitial='
+      + numInitial + '&sleep=' + sleep;
+    const img1 = document.getElementById('target')
+    img1.src = img_src;
+    // After a brief wait, remove the image and add a smaller image to target2.
+    t.step_timeout(() => {
+      img1.parentNode.removeChild(img1);
+      document.getElementById('target2').src = small_img_src;
+      beforeLoad = performance.now();
+    }, 0);
+    new PerformanceObserver(
+      t.step_func(entryList => {
+        let images = entryList.getEntries().filter(e => e.id !== '');
+        if (!images.length)
+          return;
+        assert_equals(images.length, 1, 'Should only receive one entry');
+        const entry = images[0];
+        checkImage(images[0], window.location.origin + small_img_src, 'target2', 16 * 16,
+            beforeLoad);
+        t.done();
+      })
+    ).observe({type: 'largest-contentful-paint', buffered: true});
+  }, 'Largest Contentful Paint: image removed before loaded does not produce entry.');
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-001.html b/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-001.html
index 8098c720fea..1d49169037f 100644
--- a/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-001.html
+++ b/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-001.html
@@ -47,7 +47,13 @@
               let reference = document.getElementById(`${element.getAttribute("data-reference")}`);
               forceNumberOfChildren(element, reference.children.length);
               const epsilon = 1;
-              compareLayout(element, reference, epsilon);
+              if (element.tagName == "mspace") {
+                  compareSize(element, reference, epsilon);
+                  childrenHaveEmptyBoundingClientRects(element);
+                  childrenHaveEmptyBoundingClientRects(reference);
+              } else {
+                  compareLayout(element, reference, epsilon);
+              }
           }, `${element.getAttribute("data-title")}`);
       });
       done();
diff --git a/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html b/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html
index d874e80bbba..f722512f725 100644
--- a/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html
+++ b/tests/wpt/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html
@@ -15,7 +15,7 @@
   function generateMathForTag(tag, childCount) {
       let math = FragmentHelper.createElement("math");
       let element = FragmentHelper.createElement(tag);
-      // Add the children with sizes of different sizes at odd positions and OOF
+      // Add the children with different sizes at odd positions and OOF
       // mrow at even position.
       for (let i = 0; i < childCount; i++) {
           if (i % 2) {
@@ -80,10 +80,17 @@
                   container.getBoundingClientRect();
 
                   let appendCount = appendChildrenTag.children.length;
-                  compareLayout(appendChildrenTag, referenceDiv.children[appendCount].firstElementChild, epsilon, `appending ${appendCount}-th child`);
-
                   let removeCount = removeChildrenTag.children.length;
-                  compareLayout(removeChildrenTag, referenceDiv.children[removeCount].firstElementChild, epsilon, `removing ${appendCount + 1}-th child`);
+                  if (tag == "mspace") {
+                      compareSize(appendChildrenTag, referenceDiv.children[appendCount].firstElementChild, epsilon);
+                      childrenHaveEmptyBoundingClientRects(appendChildrenTag);
+                      childrenHaveEmptyBoundingClientRects(referenceDiv.children[appendCount].firstElementChild);
+                      childrenHaveEmptyBoundingClientRects(removeChildrenTag);
+                      childrenHaveEmptyBoundingClientRects(referenceDiv.children[removeCount].firstElementChild);
+                  } else {
+                      compareLayout(appendChildrenTag, referenceDiv.children[appendCount].firstElementChild, epsilon, `appending ${appendCount}-th child`);
+                      compareLayout(removeChildrenTag, referenceDiv.children[removeCount].firstElementChild, epsilon, `removing ${appendCount + 1}-th child`);
+                  }
               }
 
               // Hide back the div after successful testing.
diff --git a/tests/wpt/web-platform-tests/mathml/support/layout-comparison.js b/tests/wpt/web-platform-tests/mathml/support/layout-comparison.js
index f9111d02ee3..452b45006e4 100644
--- a/tests/wpt/web-platform-tests/mathml/support/layout-comparison.js
+++ b/tests/wpt/web-platform-tests/mathml/support/layout-comparison.js
@@ -37,6 +37,13 @@ function compareSize(element, reference, epsilon) {
     }
 }
 
+function childrenHaveEmptyBoundingClientRects(element) {
+    Array.from(element.children).forEach(child => {
+        var childBox = child.getBoundingClientRect();
+        assert_true(childBox.left == 0 && childBox.right == 0 && childBox.top == 0 && childBox.bottom == 0);
+    })
+}
+
 function participateToParentLayout(child) {
     var style = window.getComputedStyle(child);
     return style.getPropertyValue("display") !== "none" &&
diff --git a/tests/wpt/web-platform-tests/native-file-system/opaque-origin.https.window.js b/tests/wpt/web-platform-tests/native-file-system/opaque-origin.https.window.js
index 265514760b6..a916592406e 100644
--- a/tests/wpt/web-platform-tests/native-file-system/opaque-origin.https.window.js
+++ b/tests/wpt/web-platform-tests/native-file-system/opaque-origin.https.window.js
@@ -37,15 +37,16 @@ async function verify_does_not_exist_in_data_uri_iframe(
 }
 
 // |kSandboxWindowUrl| sends two messages to this window. The first is the
-// result of chooseFileSystemEntries(). The second is the result of
+// result of showDirectoryPicker(). The second is the result of
 // getOriginPrivateDirectory(). For windows using sandbox='allow-scripts',
 // both results must produce rejected promises.
 async function verify_results_from_sandboxed_child_window(test) {
   const event_watcher = new EventWatcher(test, self, 'message');
 
   const first_message_event = await event_watcher.wait_for('message');
-  assert_equals(first_message_event.data,
-    'chooseFileSystemEntries(): REJECTED: SecurityError');
+  assert_equals(
+      first_message_event.data,
+      'showDirectoryPicker(): REJECTED: SecurityError');
 
   const second_message_event = await event_watcher.wait_for('message');
   assert_equals(second_message_event.data,
@@ -53,30 +54,33 @@ async function verify_results_from_sandboxed_child_window(test) {
 }
 
 promise_test(async test => {
-  await verify_does_not_exist_in_data_uri_iframe(
-    test, 'chooseFileSystemEntries');
-}, 'chooseFileSystemEntries() must be undefined for data URI iframes.');
+  await verify_does_not_exist_in_data_uri_iframe(test, 'showDirectoryPicker');
+}, 'showDirectoryPicker() must be undefined for data URI iframes.');
 
 promise_test(async test => {
   await verify_does_not_exist_in_data_uri_iframe(
     test, 'FileSystemDirectoryHandle');
 }, 'FileSystemDirectoryHandle must be undefined for data URI iframes.');
 
-promise_test(async test => {
-  add_iframe(test, kSandboxWindowUrl, /*sandbox=*/'allow-scripts');
-  await verify_results_from_sandboxed_child_window(test);
-}, 'getOriginPrivateDirectory() and ' +
-'chooseFileSystemEntries() must reject in a sandboxed iframe.');
+promise_test(
+    async test => {
+      add_iframe(test, kSandboxWindowUrl, /*sandbox=*/ 'allow-scripts');
+      await verify_results_from_sandboxed_child_window(test);
+    },
+    'getOriginPrivateDirectory() and ' +
+        'showDirectoryPicker() must reject in a sandboxed iframe.');
 
-promise_test(async test => {
-  const child_window_url = kSandboxWindowUrl +
-    '?pipe=header(Content-Security-Policy, sandbox allow-scripts)';
+promise_test(
+    async test => {
+      const child_window_url = kSandboxWindowUrl +
+          '?pipe=header(Content-Security-Policy, sandbox allow-scripts)';
 
-  const child_window = window.open(child_window_url);
-  test.add_cleanup(() => {
-    child_window.close();
-  });
+      const child_window = window.open(child_window_url);
+      test.add_cleanup(() => {
+        child_window.close();
+      });
 
-  await verify_results_from_sandboxed_child_window(test);
-}, 'getOriginPrivateDirectory() and '
-+ 'chooseFileSystemEntries() must reject in a sandboxed opened window.');
+      await verify_results_from_sandboxed_child_window(test);
+    },
+    'getOriginPrivateDirectory() and ' +
+        'showDirectoryPicker() must reject in a sandboxed opened window.');
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/data/testfile.txt b/tests/wpt/web-platform-tests/native-file-system/resources/data/testfile.txt
new file mode 100644
index 00000000000..980a0d5f19a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/data/testfile.txt
@@ -0,0 +1 @@
+Hello World!
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/native-fs-test-helpers.js b/tests/wpt/web-platform-tests/native-file-system/resources/native-fs-test-helpers.js
index d8137c39940..cf9f39a9a87 100644
--- a/tests/wpt/web-platform-tests/native-file-system/resources/native-fs-test-helpers.js
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/native-fs-test-helpers.js
@@ -14,11 +14,11 @@ const directory_promise = (async () => {
 
   // Small delay to give chrome's test automation a chance to actually install
   // itself.
-  await new Promise(resolve => step_timeout(resolve, 100))
+  await new Promise(resolve => step_timeout(resolve, 100));
 
   await window.test_driver.bless(
       'show a file picker.<br />Please select an empty directory');
-  const entries = await self.chooseFileSystemEntries({type: 'open-directory'});
+  const entries = await self.showDirectoryPicker();
   assert_true(entries instanceof FileSystemHandle);
   assert_true(entries instanceof FileSystemDirectoryHandle);
   for await (const entry of entries.getEntries()) {
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/opaque-origin-sandbox.html b/tests/wpt/web-platform-tests/native-file-system/resources/opaque-origin-sandbox.html
index 70b5ac545b3..e2d57a33999 100644
--- a/tests/wpt/web-platform-tests/native-file-system/resources/opaque-origin-sandbox.html
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/opaque-origin-sandbox.html
@@ -3,7 +3,7 @@
   'use strict'
 
   // Sends two messages to its creator:
-  // (1) The result of chooseFileSystemEntries().
+  // (1) The result of showDirectoryPicker().
   // (2) The result of getOriginPrivateDirectory().
 
   function post_message(data) {
@@ -16,14 +16,14 @@
   }
 
   try {
-    window.chooseFileSystemEntries({ type: 'open-directory' })
+    window.showDirectoryPicker()
       .then(() => {
-        post_message('chooseFileSystemEntries(): FULFILLED');
+        post_message('showDirectoryPicker(): FULFILLED');
       }).catch(error => {
-        post_message(`chooseFileSystemEntries(): REJECTED: ${error.name}`);
+        post_message(`showDirectoryPicker(): REJECTED: ${error.name}`);
       });
   } catch (error) {
-    post_message(`chooseFileSystemEntries(): EXCEPTION: ${error.name}`);
+    post_message(`showDirectoryPicker(): EXCEPTION: ${error.name}`);
   }
 
   try {
diff --git a/tests/wpt/web-platform-tests/native-file-system/showDirectoryPicker-manual.https.html b/tests/wpt/web-platform-tests/native-file-system/showDirectoryPicker-manual.https.html
new file mode 100644
index 00000000000..b19287877f7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/showDirectoryPicker-manual.https.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<meta charset=utf-8>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/test-helpers.js"></script>
+
+<script>
+
+  promise_test(async t => {
+    await new Promise(resolve => {
+      window.addEventListener('DOMContentLoaded', resolve);
+    });
+    // Small delay to give chrome's test automation a chance to actually install
+    // itself.
+    await new Promise(resolve => step_timeout(resolve, 100));
+
+    await window.test_driver.bless(
+      'show a directory picker.<br />Please select native-file-system/resources/data/');
+    const dir = await self.showDirectoryPicker();
+    assert_true(dir instanceof FileSystemHandle);
+    assert_true(dir instanceof FileSystemDirectoryHandle);
+    assert_false(dir.isFile);
+    assert_true(dir.isDirectory);
+    assert_equals(dir.name, 'data');
+    assert_array_equals(await getSortedDirectoryEntries(dir), ['testfile.txt']);
+
+    promise_test(async t => {
+      assert_equals(await dir.queryPermission(), 'granted');
+    }, 'showDirectoryPicker returns correct permissions');
+  }, 'showDirectoryPicker works');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/native-file-system/showOpenFilePicker-manual.https.html b/tests/wpt/web-platform-tests/native-file-system/showOpenFilePicker-manual.https.html
new file mode 100644
index 00000000000..b55157ad20f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/showOpenFilePicker-manual.https.html
@@ -0,0 +1,42 @@
+<!doctype html>
+<meta charset=utf-8>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/test-helpers.js"></script>
+
+<script>
+
+  promise_test(async t => {
+    await new Promise(resolve => {
+      window.addEventListener('DOMContentLoaded', resolve);
+    });
+    // Small delay to give chrome's test automation a chance to actually install
+    // itself.
+    await new Promise(resolve => step_timeout(resolve, 100));
+
+    await window.test_driver.bless(
+      'show a file picker.<br />Please select native-file-system/resources/data/testfile.txt');
+    const files = await self.showOpenFilePicker({
+      multiple: false, types: [
+        { description: 'Text files', accept: { ' text/plain ': ['txt'] } },
+        { description: 'Images', accept: { '  image/*  ': ['jpg', 'jpeg', 'png'] } },
+      ],
+    });
+    assert_true(Array.isArray(files));
+    assert_equals(files.length, 1);
+    assert_true(files[0] instanceof FileSystemHandle);
+    assert_true(files[0] instanceof FileSystemFileHandle);
+    assert_true(files[0].isFile);
+    assert_false(files[0].isDirectory);
+    assert_equals(files[0].name, 'testfile.txt');
+    assert_equals(await (await files[0].getFile()).text(), 'Hello World!\n');
+
+    promise_test(async t => {
+      assert_equals(await files[0].queryPermission(), 'granted');
+    }, 'showOpenFilePicker returns correct permissions');
+  }, 'showOpenFilePicker works');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/native-file-system/showPicker-errors.https.window.js b/tests/wpt/web-platform-tests/native-file-system/showPicker-errors.https.window.js
new file mode 100644
index 00000000000..1f1d2edd63d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/showPicker-errors.https.window.js
@@ -0,0 +1,82 @@
+// META: script=resources/test-helpers.js
+
+promise_test(async t => {
+  await promise_rejects_dom(t, 'SecurityError', self.showOpenFilePicker());
+}, 'showOpenFilePicker: Showing a picker requires user activation.');
+
+promise_test(async t => {
+  await promise_rejects_dom(t, 'SecurityError', self.showSaveFilePicker());
+}, 'showSaveFilePicker: Showing a picker requires user activation.');
+
+promise_test(async t => {
+  await promise_rejects_dom(t, 'SecurityError', self.showDirectoryPicker());
+}, 'showDirectoryPicker: Showing a picker requires user activation.');
+
+// TODO(mek): Add tests for cross-origin iframes, opaque origins, etc.
+
+define_file_picker_error_tests('showOpenFilePicker');
+define_file_picker_error_tests('showSaveFilePicker');
+
+function define_file_picker_error_tests(showPickerMethod) {
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({excludeAcceptAllOption: true, types: []}));
+  }, showPickerMethod + ': File picker requires at least one accepted type.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'': ['foo']}}]}));
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'  ': ['foo']}}]}));
+  }, showPickerMethod + ': MIME type can\'t be an empty string.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'image': ['foo']}}]}));
+  }, showPickerMethod + ': MIME type must have subtype.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'  /plain': ['foo']}}]}));
+  }, showPickerMethod + ': MIME type can\'t have empty type.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'image/  ': ['foo']}}]}));
+  }, showPickerMethod + ': MIME type can\'t have empty subtype.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod](
+            {types: [{accept: {'text/plain;charset=utf8': ['txt']}}]}));
+  }, showPickerMethod + ': MIME type can\'t have parameters.');
+
+  promise_test(async t => {
+    await promise_rejects_js(t, TypeError, self[showPickerMethod]({
+                               types: [{accept: {'text>foo/plain': ['txt']}}]
+                             }));
+  }, showPickerMethod + ': MIME type can\'t have invalid characters in type.');
+
+  promise_test(async t => {
+    await promise_rejects_js(
+        t, TypeError,
+        self[showPickerMethod]({types: [{accept: {'text / plain': ['txt']}}]}));
+  }, showPickerMethod + ': MIME type can\'t have whitespace in the middle.');
+
+  promise_test(
+      async t => {
+        await promise_rejects_js(
+            t, TypeError,
+            self[showPickerMethod](
+                {types: [{accept: {'text/plain>foo': ['txt']}}]}));
+      },
+      showPickerMethod +
+          ': MIME type can\'t have invalid characters in subtype.');
+}
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/showSaveFilePicker-manual.https.html b/tests/wpt/web-platform-tests/native-file-system/showSaveFilePicker-manual.https.html
new file mode 100644
index 00000000000..f8280d29ff5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/showSaveFilePicker-manual.https.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<meta charset=utf-8>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/test-helpers.js"></script>
+
+<script>
+
+  promise_test(async t => {
+    await window.test_driver.bless(
+      'show a file picker.<br />Please make a copy of native-file-system/resources/data/testfile.txt in a writable directory and pick that file');
+    const file = await self.showSaveFilePicker({
+      multiple: false, types: [
+        { description: 'Text files', accept: { 'text/plain': ['txt'] } },
+      ],
+    });
+    assert_true(file instanceof FileSystemHandle);
+    assert_true(file instanceof FileSystemFileHandle);
+    assert_true(file.isFile);
+    assert_false(file.isDirectory);
+    assert_equals(file.name, 'testfile.txt');
+    assert_equals(await (await file.getFile()).text(), '',
+      'showSaveFilePicker should clear contents of file');
+
+    promise_test(async t => {
+      assert_equals(await file.queryPermission(), 'granted');
+      assert_equals(await file.queryPermission({ writable: true }), 'granted');
+    }, 'showSaveFilePicker returns correct permissions');
+  }, 'showSaveFilePicker works');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/preload/preload-link-cached-stylesheet-different-doc.html b/tests/wpt/web-platform-tests/preload/preload-link-cached-stylesheet-different-doc.html
new file mode 100644
index 00000000000..8df1383fccd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/preload/preload-link-cached-stylesheet-different-doc.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1646776">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos �lvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="stylesheet" href="data:text/css,:root{background:green}">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  // Note that script execution waits for the stylesheet above to be loaded.
+  window.t = async_test("Stylesheets that are already loaded in the document don't cause spurious error events on preloads");
+  let subdoc = document.createElement("iframe");
+  subdoc.srcdoc = `
+    <!doctype html>
+    <meta charset="utf-8">
+    <link rel="preload" as="style" href="data:text/css,:root{background:green}" onload="parent.t.done()" onerror="parent.t.step(() => parent.assert_unreached('should not error'))">
+  `;
+  document.body.appendChild(subdoc);
+</script>
diff --git a/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js
index b655d1863cb..5a2d7b18d28 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js
@@ -20,8 +20,11 @@ var ScreenEnumerationTest = (() => {
       this.success_ = false;
     }
 
-    setIds(internalId, primaryId) {
+    setInternalId(internalId) {
       this.internalId_ = internalId;
+    }
+
+    setPrimaryId(primaryId) {
       this.primaryId_ = primaryId;
     }
 
diff --git a/tests/wpt/web-platform-tests/resources/idlharness.js b/tests/wpt/web-platform-tests/resources/idlharness.js
index f336df5f687..58d1517308a 100644
--- a/tests/wpt/web-platform-tests/resources/idlharness.js
+++ b/tests/wpt/web-platform-tests/resources/idlharness.js
@@ -1209,6 +1209,10 @@ IdlArray.prototype.assert_type_is = function(value, type)
             assert_regexp_match(value, /^([\x00-\ud7ff\ue000-\uffff]|[\ud800-\udbff][\udc00-\udfff])*$/);
             return;
 
+        case "ArrayBufferView":
+            assert_true(ArrayBuffer.isView(value));
+            return;
+
         case "object":
             assert_in_array(typeof value, ["object", "function"], "wrong type: not object or function");
             return;
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/README.md b/tests/wpt/web-platform-tests/screen_enumeration/README.md
index b2d39f534ac..e3de83d0a89 100644
--- a/tests/wpt/web-platform-tests/screen_enumeration/README.md
+++ b/tests/wpt/web-platform-tests/screen_enumeration/README.md
@@ -13,7 +13,8 @@ The `ScreenEnumerationTest` interface is defined as:
 
   class MockScreenEnumeration {
     reset(); Empties data of created mock displays.
-    setId(internalId, primaryId); // Set primary screen and internal screen IDs.
+    setInternalId(internalId); // Set internal screen ID.
+    setPrimaryId(primaryId); // Set primary screen ID.
     setSuccess(success); // Set boolean to validate getDisplays() returned values.
     addDisplay(display); // Push display to the display vector.
     removeDisplay(id); // Remove display from the display vector.
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html
index 3d70a7c81cf..3b8060786e1 100644
--- a/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html
+++ b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html
@@ -17,7 +17,8 @@ screen_enumeration_test(async (t, mockScreenEnum) => {
                              1.0);
 
   mockScreenEnum.addDisplay(display1);
-  mockScreenEnum.setIds(mockScreenEnum.displays_[0].id, mockScreenEnum.displays_[0].id);
+  mockScreenEnum.setPrimaryId(mockScreenEnum.displays_[0].id);
+  mockScreenEnum.setInternalId(mockScreenEnum.displays_[0].id);
   mockScreenEnum.setSuccess(true);
 
   // Grant window-placement permissions for testdriver.
@@ -61,7 +62,8 @@ screen_enumeration_test(async (t, mockScreenEnum) => {
   mockScreenEnum.addDisplay(display1);
   mockScreenEnum.addDisplay(display2);
   mockScreenEnum.addDisplay(display3);
-  mockScreenEnum.setIds(mockScreenEnum.displays_[0].id, mockScreenEnum.displays_[0].id);
+  mockScreenEnum.setPrimaryId(mockScreenEnum.displays_[0].id);
+  mockScreenEnum.setInternalId(mockScreenEnum.displays_[0].id);
   mockScreenEnum.setSuccess(true);
 
   // Grant window-placement permissions for testdriver.
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event.https.html
index 169a0b17d62..48f71e46cb2 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event.https.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/get-host-info.sub.js"></script>
+<script src="/common/utils.js"></script>
 <script src="resources/test-helpers.sub.js"></script>
 <body>
 <script>
@@ -422,6 +423,32 @@ promise_test(t => {
         });
   }, 'FetchEvent#body is a string');
 
+// Test that the service worker can read FetchEvent#body when it is made from
+// a ReadableStream. It responds with request body it read.
+promise_test(async t => {
+    const rs = new ReadableStream({start(c) {
+      c.enqueue('i a');
+      c.enqueue('m the request');
+      step_timeout(t.step_func(() => {
+        c.enqueue(' body');
+        c.close();
+      }, 10));
+    }});
+
+    // Set page_url to "?ignore" so the service worker falls back to network
+    // for the main resource request, and add a suffix to avoid colliding
+    // with other tests.
+    const page_url = `resources/simple.html?ignore&id=${token()}`;
+
+    const frame = await with_iframe(page_url);
+    t.add_cleanup(() => { frame.remove(); });
+    const res = await frame.contentWindow.fetch('simple.html?request-body', {
+      method: 'POST',
+      body: rs.pipeThrough(new TextEncoderStream())
+    });
+    assert_equals(await res.text(), 'i am the request body');
+  }, 'FetchEvent#body is a ReadableStream');
+
 // Test that the request body is sent to network upon network fallback,
 // for a string body.
 promise_test(t => {
diff --git a/tests/wpt/web-platform-tests/streams/idlharness.any.js b/tests/wpt/web-platform-tests/streams/idlharness.any.js
index e9f085bfc0e..42a17da58c5 100644
--- a/tests/wpt/web-platform-tests/streams/idlharness.any.js
+++ b/tests/wpt/web-platform-tests/streams/idlharness.any.js
@@ -28,16 +28,20 @@ idl_test(
     } catch {}
 
     try {
+      let resolvePullCalledPromise;
+      const pullCalledPromise = new Promise(resolve => {
+        resolvePullCalledPromise = resolve;
+      });
       const stream = new ReadableStream({
-        pull() {
-          self.readableStreamByobRequest = controller.byobRequest;
+        pull(c) {
+          self.readableStreamByobRequest = c.byobRequest;
+          resolvePullCalledPromise();
         },
         type: 'bytes'
       });
-
       const reader = stream.getReader({ mode: 'byob' });
-
-      await reader.read(new Uint8Array(1));
+      reader.read(new Uint8Array(1));
+      await pullCalledPromise;
     } catch {}
 
     try {
@@ -59,7 +63,7 @@ idl_test(
     idl_array.add_objects({
       ReadableStream: ["new ReadableStream()"],
       ReadableStreamDefaultReader: ["(new ReadableStream()).getReader()"],
-      ReadableStreamBYOBReader: ["(new ReadableStream({ type: 'bytes' })).getReader('byob')"],
+      ReadableStreamBYOBReader: ["(new ReadableStream({ type: 'bytes' })).getReader({ mode: 'byob' })"],
       ReadableStreamDefaultController: ["self.readableStreamDefaultController"],
       ReadableByteStreamController: ["self.readableByteStreamController"],
       ReadableStreamBYOBRequest: ["self.readableStreamByobRequest"],
diff --git a/tests/wpt/web-platform-tests/tools/ci/tc/tasks/test.yml b/tests/wpt/web-platform-tests/tools/ci/tc/tasks/test.yml
index 3fae9eacaf1..7943e671282 100644
--- a/tests/wpt/web-platform-tests/tools/ci/tc/tasks/test.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/tc/tasks/test.yml
@@ -21,8 +21,13 @@ components:
     vars:
       test-type: reftest
 
-  wpt-wdspec:
+  wpt-print-reftest:
     chunks: 1
+    vars:
+      test-type: print-reftest
+
+  wpt-wdspec:
+    chunks: 2
     vars:
       test-type: wdspec
 
@@ -130,6 +135,8 @@ tasks:
             suite: testharness
         - vars:
             suite: reftest
+        - vars:
+            suite: print-reftest
         - vars:
             suite: wdspec
         - vars:
diff --git a/tests/wpt/web-platform-tests/tools/ci/tc/tests/test_valid.py b/tests/wpt/web-platform-tests/tools/ci/tc/tests/test_valid.py
index acfe875d74d..a116ca89310 100644
--- a/tests/wpt/web-platform-tests/tools/ci/tc/tests/test_valid.py
+++ b/tests/wpt/web-platform-tests/tools/ci/tc/tests/test_valid.py
@@ -124,9 +124,13 @@ def test_verify_payload():
       'wpt-chrome-dev-reftest-4',
       'wpt-chrome-dev-reftest-5',
       'wpt-firefox-nightly-wdspec-1',
+      'wpt-firefox-nightly-wdspec-2',
       'wpt-chrome-dev-wdspec-1',
+      'wpt-chrome-dev-wdspec-2',
       'wpt-firefox-nightly-crashtest-1',
       'wpt-chrome-dev-crashtest-1',
+      'wpt-firefox-nightly-print-reftest-1',
+      'wpt-chrome-dev-print-reftest-1',
       'lint'}),
     ("pr_event.json", True, {".taskcluster.yml",".travis.yml","tools/ci/start.sh"},
      {'download-firefox-nightly',
@@ -158,6 +162,7 @@ def test_verify_payload():
       'wpt-chrome-stable-reftest-3',
       'wpt-chrome-stable-reftest-4',
       'wpt-chrome-stable-reftest-5',
+      'wpt-chrome-stable-print-reftest-1',
       'wpt-chrome-stable-testharness-1',
       'wpt-chrome-stable-testharness-10',
       'wpt-chrome-stable-testharness-11',
@@ -175,12 +180,14 @@ def test_verify_payload():
       'wpt-chrome-stable-testharness-8',
       'wpt-chrome-stable-testharness-9',
       'wpt-chrome-stable-wdspec-1',
+      'wpt-chrome-stable-wdspec-2',
       'wpt-chrome-stable-crashtest-1',
       'wpt-firefox-stable-reftest-1',
       'wpt-firefox-stable-reftest-2',
       'wpt-firefox-stable-reftest-3',
       'wpt-firefox-stable-reftest-4',
       'wpt-firefox-stable-reftest-5',
+      'wpt-firefox-stable-print-reftest-1',
       'wpt-firefox-stable-testharness-1',
       'wpt-firefox-stable-testharness-10',
       'wpt-firefox-stable-testharness-11',
@@ -198,12 +205,14 @@ def test_verify_payload():
       'wpt-firefox-stable-testharness-8',
       'wpt-firefox-stable-testharness-9',
       'wpt-firefox-stable-wdspec-1',
+      'wpt-firefox-stable-wdspec-2',
       'wpt-firefox-stable-crashtest-1',
       'wpt-webkitgtk_minibrowser-nightly-reftest-1',
       'wpt-webkitgtk_minibrowser-nightly-reftest-2',
       'wpt-webkitgtk_minibrowser-nightly-reftest-3',
       'wpt-webkitgtk_minibrowser-nightly-reftest-4',
       'wpt-webkitgtk_minibrowser-nightly-reftest-5',
+      'wpt-webkitgtk_minibrowser-nightly-print-reftest-1',
       'wpt-webkitgtk_minibrowser-nightly-testharness-1',
       'wpt-webkitgtk_minibrowser-nightly-testharness-10',
       'wpt-webkitgtk_minibrowser-nightly-testharness-11',
@@ -221,12 +230,14 @@ def test_verify_payload():
       'wpt-webkitgtk_minibrowser-nightly-testharness-8',
       'wpt-webkitgtk_minibrowser-nightly-testharness-9',
       'wpt-webkitgtk_minibrowser-nightly-wdspec-1',
+      'wpt-webkitgtk_minibrowser-nightly-wdspec-2',
       'wpt-webkitgtk_minibrowser-nightly-crashtest-1',
       'wpt-servo-nightly-reftest-1',
       'wpt-servo-nightly-reftest-2',
       'wpt-servo-nightly-reftest-3',
       'wpt-servo-nightly-reftest-4',
       'wpt-servo-nightly-reftest-5',
+      'wpt-servo-nightly-print-reftest-1',
       'wpt-servo-nightly-testharness-1',
       'wpt-servo-nightly-testharness-10',
       'wpt-servo-nightly-testharness-11',
@@ -244,6 +255,7 @@ def test_verify_payload():
       'wpt-servo-nightly-testharness-8',
       'wpt-servo-nightly-testharness-9',
       'wpt-servo-nightly-wdspec-1',
+      'wpt-servo-nightly-wdspec-2',
       'wpt-servo-nightly-crashtest-1',})
 ])
 def test_schedule_tasks(event_path, is_pr, files_changed, expected):
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/AUTHORS.rst b/tests/wpt/web-platform-tests/tools/third_party/html5lib/AUTHORS.rst
index fc635dea75b..904013908d2 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/AUTHORS.rst
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/AUTHORS.rst
@@ -4,7 +4,7 @@ Credits
 ``html5lib`` is written and maintained by:
 
 - James Graham
-- Geoffrey Sneddon
+- Sam Sneddon
 - �ukasz Langa
 - Will Kahn-Greene
 
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/CHANGES.rst b/tests/wpt/web-platform-tests/tools/third_party/html5lib/CHANGES.rst
index 82605a216b2..fcb22475cd5 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/CHANGES.rst
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/CHANGES.rst
@@ -1,6 +1,30 @@
 Change Log
 ----------
 
+1.1
+~~~
+
+UNRELEASED
+
+Breaking changes:
+
+* Drop support for Python 3.3. (#358)
+* Drop support for Python 3.4. (#421)
+
+Deprecations:
+
+* Deprecate the ``html5lib`` sanitizer (``html5lib.serialize(sanitize=True)`` and
+  ``html5lib.filters.sanitizer``). We recommend users migrate to `Bleach
+  <https://github.com/mozilla/bleach>`. Please let us know if Bleach doesn't suffice for your
+  use. (#443)
+
+Other changes:
+
+* Try to import from ``collections.abc`` to remove DeprecationWarning and ensure
+  ``html5lib`` keeps working in future Python versions. (#403)
+* Drop optional ``datrie`` dependency. (#442)
+
+
 1.0.1
 ~~~~~
 
@@ -20,7 +44,7 @@ Features:
 * Support Python 3.6. (#333) (Thank you, Jon Dufresne!)
 * Add CI support for Windows using AppVeyor. (Thank you, John Vandenberg!)
 * Improve testing and CI and add code coverage (#323, #334), (Thank you, Jon
-  Dufresne, John Vandenberg, Geoffrey Sneddon, Will Kahn-Greene!)
+  Dufresne, John Vandenberg, Sam Sneddon, Will Kahn-Greene!)
 * Semver-compliant version number.
 
 Bug fixes:
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/README.rst b/tests/wpt/web-platform-tests/tools/third_party/html5lib/README.rst
index 8c151328b3d..d367905da0a 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/README.rst
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/README.rst
@@ -1,8 +1,9 @@
 html5lib
 ========
 
-.. image:: https://travis-ci.org/html5lib/html5lib-python.png?branch=master
-  :target: https://travis-ci.org/html5lib/html5lib-python
+.. image:: https://travis-ci.org/html5lib/html5lib-python.svg?branch=master
+    :target: https://travis-ci.org/html5lib/html5lib-python
+
 
 html5lib is a pure-python library for parsing HTML. It is designed to
 conform to the WHATWG HTML specification, as is implemented by all major
@@ -90,13 +91,15 @@ More documentation is available at https://html5lib.readthedocs.io/.
 Installation
 ------------
 
-html5lib works on CPython 2.7+, CPython 3.3+ and PyPy.  To install it,
-use:
+html5lib works on CPython 2.7+, CPython 3.5+ and PyPy. To install:
 
 .. code-block:: bash
 
     $ pip install html5lib
 
+The goal is to support a (non-strict) superset of the versions that `pip
+supports
+<https://pip.pypa.io/en/stable/installing/#python-and-os-compatibility>`_.
 
 Optional Dependencies
 ---------------------
@@ -104,9 +107,6 @@ Optional Dependencies
 The following third-party libraries may be used for additional
 functionality:
 
-- ``datrie`` can be used under CPython to improve parsing performance
-  (though in almost all cases the improvement is marginal);
-
 - ``lxml`` is supported as a tree format (for both building and
   walking) under CPython (but *not* PyPy where it is known to cause
   segfaults);
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_html.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_html.py
new file mode 100644
index 00000000000..cfe53c6733a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_html.py
@@ -0,0 +1,57 @@
+import io
+import os
+import sys
+
+import pyperf
+
+sys.path[0:0] = [os.path.join(os.path.dirname(__file__), "..")]
+import html5lib  # noqa: E402
+
+
+def bench_parse(fh, treebuilder):
+    fh.seek(0)
+    html5lib.parse(fh, treebuilder=treebuilder, useChardet=False)
+
+
+def bench_serialize(loops, fh, treebuilder):
+    fh.seek(0)
+    doc = html5lib.parse(fh, treebuilder=treebuilder, useChardet=False)
+
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+
+    for loops in range_it:
+        html5lib.serialize(doc, tree=treebuilder, encoding="ascii", inject_meta_charset=False)
+
+    return pyperf.perf_counter() - t0
+
+
+BENCHMARKS = ["parse", "serialize"]
+
+
+def add_cmdline_args(cmd, args):
+    if args.benchmark:
+        cmd.append(args.benchmark)
+
+
+if __name__ == "__main__":
+    runner = pyperf.Runner(add_cmdline_args=add_cmdline_args)
+    runner.metadata["description"] = "Run benchmarks based on Anolis"
+    runner.argparser.add_argument("benchmark", nargs="?", choices=BENCHMARKS)
+
+    args = runner.parse_args()
+    if args.benchmark:
+        benchmarks = (args.benchmark,)
+    else:
+        benchmarks = BENCHMARKS
+
+    with open(os.path.join(os.path.dirname(__file__), "data", "html.html"), "rb") as fh:
+        source = io.BytesIO(fh.read())
+
+    if "parse" in benchmarks:
+        for tb in ("etree", "dom", "lxml"):
+            runner.bench_func("html_parse_%s" % tb, bench_parse, source, tb)
+
+    if "serialize" in benchmarks:
+        for tb in ("etree", "dom", "lxml"):
+            runner.bench_time_func("html_serialize_%s" % tb, bench_serialize, source, tb)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_wpt.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_wpt.py
new file mode 100644
index 00000000000..d5da006984c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/bench_wpt.py
@@ -0,0 +1,45 @@
+import io
+import os
+import sys
+
+import pyperf
+
+sys.path[0:0] = [os.path.join(os.path.dirname(__file__), "..")]
+import html5lib  # noqa: E402
+
+
+def bench_html5lib(fh):
+    fh.seek(0)
+    html5lib.parse(fh, treebuilder="etree", useChardet=False)
+
+
+def add_cmdline_args(cmd, args):
+    if args.benchmark:
+        cmd.append(args.benchmark)
+
+
+BENCHMARKS = {}
+for root, dirs, files in os.walk(os.path.join(os.path.dirname(os.path.abspath(__file__)), "data", "wpt")):
+    for f in files:
+        if f.endswith(".html"):
+            BENCHMARKS[f[: -len(".html")]] = os.path.join(root, f)
+
+
+if __name__ == "__main__":
+    runner = pyperf.Runner(add_cmdline_args=add_cmdline_args)
+    runner.metadata["description"] = "Run parser benchmarks from WPT"
+    runner.argparser.add_argument("benchmark", nargs="?", choices=sorted(BENCHMARKS))
+
+    args = runner.parse_args()
+    if args.benchmark:
+        benchmarks = (args.benchmark,)
+    else:
+        benchmarks = sorted(BENCHMARKS)
+
+    for bench in benchmarks:
+        name = "wpt_%s" % bench
+        path = BENCHMARKS[bench]
+        with open(path, "rb") as fh:
+            fh2 = io.BytesIO(fh.read())
+
+        runner.bench_func(name, bench_html5lib, fh2)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/README.md b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/README.md
new file mode 100644
index 00000000000..5b896cbb7c1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/README.md
@@ -0,0 +1,8 @@
+The files in this data are derived from:
+
+ * `html.html`: from [html](http://github.com/whatwg/html), revision
+   77db356a293f2b152b648c836b6989d17afe42bb. This is the first 5000 lines of `source`. (This is
+   representative of the input to [Anolis](https://bitbucket.org/ms2ger/anolis/); first 5000 lines
+   chosen to make it parse in a reasonable time.)
+
+ * `wpt`: see `wpt/README.md`.
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/html.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/html.html
new file mode 100644
index 00000000000..d2bb1be7452
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/html.html
@@ -0,0 +1,5000 @@
+<!-- EDITOR NOTES  -*- mode: Text; fill-column: 100 -*-
+ !
+ !   Adding a new element involves editing the following sections:
+ !    - section for the element itself
+ !    - descriptions of the element's categories
+ !    - images/content-venn.svg
+ !    - syntax, if it's void or otherwise special
+ !    - parser, if it's not phrasing-level
+ !    - rendering
+ !    - obsolete section
+ !    - element, attribute, content model, and interface indexes
+ !    - adding it to the section with ARIA mappings
+ !
+ !-->
+
+<!--
+ ! http://lists.w3.org/Archives/Public/www-archive/2014Apr/0034.html
+ !-->
+
+<!--START complete--><!--START dev-html-->
+<!DOCTYPE html>
+<!--SET FINGERPRINT=<span title="fingerprinting vector" class="fingerprint"><img src="images/fingerprint.png" alt="(This is a fingerprinting vector.)" width=46 height=64></span>-->
+<html lang="en-GB-x-hixie" class="big">
+ <head>
+  <title>HTML Standard</title>
+  <script>
+   var loadTimer = new Date();
+   var current_revision = "r" + "$Revision: 1 $".substr(11);
+   current_revision = current_revision.substr(0, current_revision.length - 2);
+   var last_known_revision = current_revision;
+   function F( /* varargs... */) {
+     var fragment = document.createDocumentFragment();
+     for (var index = 0; index < arguments.length; index += 1) {
+       if (arguments[index] instanceof Array) {
+         fragment.appendChild(F.apply(this, arguments[index]));
+       } else if (typeof arguments[index] == 'string') {
+         fragment.appendChild(document.createTextNode(arguments[index]));
+       } else {
+         fragment.appendChild(arguments[index]);
+       }
+     }
+     return fragment;
+   }
+   function E(name, /* optional */ attributes /*, varargs... */) {
+     var element = document.createElement(name);
+     var index = 1;
+     if ((arguments.length > 1) && (typeof attributes != 'string') &&
+         (!(attributes instanceof Node)) && (!(attributes instanceof Array))) {
+       for (var attName in attributes) {
+         if (typeof attributes[attName] == 'boolean') {
+           if (attributes[attName])
+             element.setAttribute(attName, '');
+         } else if (typeof attributes[attName] == 'function') {
+           element[attName] = attributes[attName];
+         } else {
+           element.setAttribute(attName, attributes[attName]);
+         }
+       }
+       index = 2;
+     }
+     for (; index < arguments.length; index += 1) {
+       if (arguments[index] instanceof Array) {
+         element.appendChild(F.apply(this, arguments[index]));
+       } else if (typeof arguments[index] == 'string') {
+         element.appendChild(document.createTextNode(arguments[index]));
+       } else {
+         element.appendChild(arguments[index]);
+       }
+     }
+     return element;
+   }
+   function getCookie(name) {
+     var params = location.search.substr(1).split("&");
+     for (var index = 0; index < params.length; index++) {
+       if (params[index] == name)
+         return "1";
+       var data = params[index].split("=");
+       if (data[0] == name)
+         return unescape(data[1]);
+     }
+     var cookies = document.cookie.split("; ");
+     for (var index = 0; index < cookies.length; index++) {
+       var data = cookies[index].split("=");
+       if (data[0] == name)
+         return unescape(data[1]);
+     }
+     return null;
+   }
+   var currentAlert;
+   var currentAlertTimeout;
+   function showAlert(s, href) {
+     if (!currentAlert) {
+       currentAlert = document.createElement('div');
+       currentAlert.id = 'alert';
+       var x = document.createElement('button');
+       x.textContent = '\u2573';
+       x.onclick = closeAlert2;
+       currentAlert.appendChild(x);
+       currentAlert.appendChild(document.createElement('span'));
+       currentAlert.onmousemove = function () {
+         clearTimeout(currentAlertTimeout);
+         currentAlert.className = '';
+         currentAlertTimeout = setTimeout(closeAlert, 10000);
+       }
+       document.body.appendChild(currentAlert);
+     } else {
+       clearTimeout(currentAlertTimeout);
+       currentAlert.className = '';
+     }
+     currentAlert.lastChild.textContent = '';
+     currentAlert.lastChild.appendChild(F(s));
+     if (href) {
+       var link = document.createElement('a');
+       link.href = href;
+       link.textContent = href;
+       currentAlert.lastChild.appendChild(F(' ', link));
+     }
+     currentAlertTimeout = setTimeout(closeAlert, 10000);
+   }
+   function closeAlert() {
+     clearTimeout(currentAlertTimeout);
+     if (currentAlert) {
+       currentAlert.className = 'closed';
+       currentAlertTimeout = setTimeout(closeAlert2, 3000);
+     }
+   }
+   function closeAlert2() {
+     clearTimeout(currentAlertTimeout);
+     if (currentAlert) {
+       currentAlert.parentNode.removeChild(currentAlert);
+       currentAlert = null;
+     }
+   }
+   window.addEventListener('keydown', function (event) {
+     if (event.keyCode == 27) {
+       if (currentAlert)
+         closeAlert2();
+     } else {
+       closeAlert();
+     }
+   }, false);
+   window.addEventListener('scroll', function (event) {
+     closeAlert();
+   }, false);
+   function load(script) {
+     var e = document.createElement('script');
+     e.setAttribute('src', '//www.whatwg.org/specs/web-apps/current-work/' + script);
+     document.body.appendChild(e);
+   }
+
+   var startedInit = 0;
+   function init() {
+     startedInit = 1;
+     if (location.search == '?slow-browser')
+       return;
+     load('reviewer.js');
+     if (document.documentElement.className == "big" || document.documentElement.className == "big split index")
+       load('toc.js');
+     load('updater.js');
+     load('dfn.js');
+     load('status.js');
+     if (getCookie('profile') == '1')
+       document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
+   }
+   if (document.documentElement.className == "")
+     setTimeout(function () {
+       if (!startedInit)
+         showAlert("Too slow? Try reading the multipage copy of the spec instead:", "http://whatwg.org/html");
+     }, 6000);
+
+   window.addEventListener('keypress', function (event) {
+     if ((event.which == 114) && (event.metaKey)) {
+       if (!confirm('Are you sure you want to reload this page?'))
+         event.preventDefault();
+     }
+   }, false);
+
+  </script>
+  <link rel="stylesheet" href="//www.whatwg.org/style/specification">
+  <link rel="icon" href="//www.whatwg.org/images/icon">
+  <style>
+   .proposal { border: blue solid; padding: 1em; }
+   .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
+   #updatesStatus { display: none; z-index: 10; }
+   #updatesStatus.relevant { display: block; position: fixed; right: 1em; top: 1em; padding: 0.5em; font: bold small sans-serif; min-width: 25em; width: 30%; max-width: 40em; height: auto; border: ridge 4px gray; background: #EEEEEE; color: black; }
+   div.head .logo { width: 11em; margin-bottom: 20em; }
+
+   #configUI { position: absolute; z-index: 20; top: auto; right: 0; width: 11em; padding: 0 0.5em 0 0.5em; font-size: small; background: gray; background: rgba(32,32,32,0.9); color: white; border-radius: 1em 0 0 1em; -moz-border-radius: 1em 0 0 1em; }
+   #configUI p { margin: 0.75em 0; padding: 0.3em; }
+   #configUI p label { display: block; }
+   #configUI #updateUI, #configUI .loginUI { text-align: center; }
+   #configUI input[type=button] { display: block; margin: auto; }
+   #configUI :link, #configUI :visited { color: white; }
+   #configUI :link:hover, #configUI :visited:hover { background: transparent; }
+
+   #alert { position: fixed; top: 20%; left: 20%; right: 20%; font-size: 2em; padding: 0.5em; z-index: 40; background: gray; background: rgba(32,32,32,0.9); color: white; border-radius: 1em; -moz-border-radius: 1em; -webkit-transition: opacity 1s linear; }
+   #alert.closed { opacity: 0; }
+   #alert button { position: absolute; top: -1em; right: 2em; border-radius: 1em 1em 0 0; border: none; line-height: 0.9; color: white; background: rgb(64,64,64); font-size: 0.6em; font-weight: 900; cursor: pointer; }
+   #alert :link, #alert :visited { color: white; }
+   #alert :link:hover, #alert :visited:hover { background: transparent; }
+   @media print { #configUI { display: none; } }
+
+   .rfc2119 { font-variant: small-caps; text-shadow: 0 0 0.5em yellow; position: static; }
+   .rfc2119::after { position: absolute; left: 0; width: 25px; text-align: center; color: yellow; text-shadow: 0.075em 0.075em 0.2em black; }
+   .rfc2119.m\ust::after { content: '\2605'; }
+   .rfc2119.s\hould::after { content: '\2606'; }
+   [hidden] { display: none; }
+
+   .fingerprint { float: right; }
+
+   .applies thead th > * { display: block; }
+   .applies thead code { display: block; }
+   .applies td { text-align: center; }
+   .applies .yes { background: yellow; }
+
+   .matrix, .matrix td { border: hidden; text-align: right; }
+   .matrix { margin-left: 2em; }
+
+   .vertical-summary-table tr > th[rowspan="2"]:first-child + th,
+   .vertical-summary-table tr > td[rowspan="2"]:first-child + td { border-bottom: hidden; }
+
+   .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
+   .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
+   .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
+
+   td.eg { border-width: thin; text-align: center; }
+
+   #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
+   #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
+   #table-example-1 caption { padding-bottom: 0.5em; }
+   #table-example-1 thead, #table-example-1 tbody { border: none; }
+   #table-example-1 th, #table-example-1 td { border: solid thin; }
+   #table-example-1 th { font-weight: normal; }
+   #table-example-1 td { border-style: none solid; vertical-align: top; }
+   #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
+   #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
+   #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
+   #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
+   #table-example-1 tbody td:first-child::after { content: leader(". "); }
+   #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
+   #table-example-1 tbody td:first-child + td { width: 10em; }
+   #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
+   #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
+
+   .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
+   .apple-table-examples * { font-family: "Times", serif; }
+   .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
+   .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
+   .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
+   .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
+   .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
+   .apple-table-examples td { text-align: right; vertical-align: top; }
+   .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
+   .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
+   .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
+   .apple-table-examples sup { line-height: 0; }
+
+   .three-column-nowrap tr > td:first-child,
+   .three-column-nowrap tr > td:first-child + td,
+   .three-column-nowrap tr > td:first-child + td + td { white-space: nowrap; }
+
+   .details-example img { vertical-align: top; }
+
+   #base64-table {
+     white-space: nowrap;
+     font-size: 0.6em;
+     column-width: 6em;
+     column-count: 5;
+     column-gap: 1em;
+     -moz-column-width: 6em;
+     -moz-column-count: 5;
+     -moz-column-gap: 1em;
+     -webkit-column-width: 6em;
+     -webkit-column-count: 5;
+     -webkit-column-gap: 1em;
+   }
+   #base64-table thead { display: none; }
+   #base64-table * { border: none; }
+   #base64-table tbody td:first-child:after { content: ':'; }
+   #base64-table tbody td:last-child { text-align: right; }
+
+   #named-character-references-table {
+     white-space: nowrap;
+     font-size: 0.6em;
+     column-width: 30em;
+     column-gap: 1em;
+     -moz-column-width: 30em;
+     -moz-column-gap: 1em;
+     -webkit-column-width: 30em;
+     -webkit-column-gap: 1em;
+   }
+   #named-character-references-table > table > tbody > tr > td:first-child + td,
+   #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
+   #named-character-references-table > table > tbody > tr > td:last-child:hover > span { position: absolute; top: auto; left: auto; margin-left: 0.5em; line-height: 1.2; font-size: 5em; border: outset; padding: 0.25em 0.5em; background: white; width: 1.25em; height: auto; text-align: center; }
+   #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
+
+   .glyph.control { color: red; }
+
+   @font-face {
+     font-family: 'Essays1743';
+     src: url('//www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
+   }
+   @font-face {
+     font-family: 'Essays1743';
+     font-weight: bold;
+     src: url('//www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
+   }
+   @font-face {
+     font-family: 'Essays1743';
+     font-style: italic;
+     src: url('//www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
+   }
+   @font-face {
+     font-family: 'Essays1743';
+     font-style: italic;
+     font-weight: bold;
+     src: url('//www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
+   }
+  </style>
+  <link rel="stylesheet" href="status.css">
+ </head>
+ <body onload="init()">
+  <header class="head with-buttons" id="head">
+   <p><a href="//www.whatwg.org/" class="logo"><img width="101" height="101" alt="WHATWG" src="/images/logo"></a></p>
+   <hgroup>
+    <h1 class="allcaps">HTML</h1>
+    <h2 class="no-num no-toc">Living Standard &mdash; Last Updated <span class="pubdate">[DATE: 01 Jan 1901]</span></h2>
+   </hgroup>
+   <div>
+    <div>
+     <a href="//whatwg.org/html"><span><strong>Multipage Version</strong> <code>whatwg.org/html</code></span></a>
+     <a href="//whatwg.org/c"><span><strong>One-Page Version</strong> <code>whatwg.org/c</code></span></a>
+     <a href="//whatwg.org/pdf"><span><strong>PDF Version</strong> <code>whatwg.org/pdf</code></span></a>
+     <a href="http://developers.whatwg.org/"><span><strong>Developer Version</strong> <code>developers.whatwg.org</code></span></a>
+    </div>
+    <div>
+     <a class="misc" href="//whatwg.org/faq"><span><strong>FAQ</strong> <code>whatwg.org/faq</code></span></a>
+     <a class="misc" href="http://validator.whatwg.org/"><span><strong>Validators</strong> <code>validator.whatwg.org</code></span></a>
+    </div>
+    <div>
+     <a class="comms" href="//www.whatwg.org/mailing-list"><span><strong>Join our Mailing List</strong> <code>whatwg@whatwg.org</code></span></a>
+     <a class="comms" href="http://wiki.whatwg.org/wiki/IRC"><span><strong>Join us on IRC</strong> <code>#whatwg on Freenode</code></span></a>
+     <a class="comms" href="http://forums.whatwg.org/"><span><strong>Join our Forums</strong> <code>forums.whatwg.org</code></span></a>
+    </div>
+    <div>
+     <!--<a class="changes" href="http://svn.whatwg.org/webapps"><span><strong>SVN Repository</strong> <code>svn.whatwg.org/webapps</code></span></a>-->
+     <a class="changes" href="http://html5.org/tools/web-apps-tracker"><span><strong>Change Log</strong> <code>html5.org's tracker</code></span></a>
+     <a class="changes" href="http://twitter.com/WHATWG"><span><strong>Twitter Updates</strong> <code>@WHATWG</code></span></a>
+    </div>
+    <div>
+     <a class="feedback" href="https://www.w3.org/Bugs/Public/buglist.cgi?bug_status=UNCONFIRMED&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;component=HTML&amp;product=WHATWG"><span><strong>View Open Bugs</strong> <code>filed in Bugzilla</code></span></a>
+     <a class="feedback" href="//www.whatwg.org/newbug"><span><strong>File a Bug</strong> <code>whatwg.org/newbug</code></span></a>
+     <a class="feedback" href="http://ian.hixie.ch/+"><span><strong>E-mail the Editor</strong> <code>ian@hixie.ch</code></span></a>
+    </div>
+   </div>
+  </header>
+
+  <hr>
+
+  <div id="configUI"></div>
+
+  <h2 class="no-num no-toc" id="contents">Table of contents</h2>
+  <!--toc-->
+
+  <hr>
+
+<!--
+  <pre class="idl">
+   interface Screen { }; // CSSOM
+   interface URL { }; // URL API
+   interface Blob { }; // File API
+   interface File : Blob { }; // File API
+   interface FileList { }; // File API
+   interface WebGLRenderingContext { }; // WebGL
+   interface XMLDocument { }; // DOM
+   interface HTMLCollection { }; // DOM
+   interface DOMTokenList { }; // DOM
+   interface DOMSettableTokenList { attribute any value; }; // DOM
+   interface SVGMatrix { }; // SVG
+   // fake interfaces that map to JS object types:
+   interface ArrayBuffer { };
+   interface Int8Array { };
+   interface Uint8Array { };
+   interface Uint8ClampedArray { };
+   interface Int16Array { };
+   interface Uint16Array { };
+   interface Int32Array { };
+   interface Uint32Array { };
+   interface Float32Array { };
+   interface Float64Array { };
+   interface Uint8ClampedArray { };
+  </pre>
+-->
+
+  <h2 id="introduction">Introduction</h2>
+
+  <div class="nodev">
+
+  <h3 id="abstract">Where does this specification fit?</h3>
+
+  <p>This specification defines a big part of the Web platform, in lots of detail. Its place in the
+  Web platform specification stack relative to other specifications can be best summed up as
+  follows:</p>
+
+  <p><img src="images/abstract.png" width="398" height="359" alt="It consists of everything else, above such core technologies as HTTP, URI/IRIs, DOM, XML, Unicode, and ECMAScript; below presentation-layer technologies like CSS and the NPAPI; and to the side of technologies like Geolocation, SVG, MathML, and XHR."></p>
+
+  </div>
+
+
+  <h3 id="is-this-html5?">Is this HTML5?</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>In short: Yes.</p>
+
+  <p>In more length: The term "HTML5" is widely used as a buzzword to refer to modern Web
+  technologies, many of which (though by no means all) are developed at the WHATWG. This document is
+  one such; others are available from <a href="http://www.whatwg.org/specs/">the WHATWG
+  specification index</a>.</p>
+
+  <p class="note">Although we have asked them to stop doing so, the W3C also republishes some parts
+  of this specification as separate documents. There are numerous differences between this
+  specification and the W3C forks; some minor, some major. Unfortunately these are not currently
+  accurately documented anywhere, so there is no way to know which are intentional and which are
+  not.</p>
+
+
+  <h3>Background</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>HTML is the World Wide Web's core markup language. Originally, HTML was primarily designed as a
+  language for semantically describing scientific documents. Its general design, however, has
+  enabled it to be adapted, over the subsequent years, to describe a number of other types of
+  documents and even applications.</p>
+
+
+  <h3>Audience</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>This specification is intended for authors of documents and scripts that use the features
+  defined in this specification<span class="nodev">, implementors of tools that operate on pages that
+  use the features defined in this specification, and individuals wishing to establish the
+  correctness of documents or implementations with respect to the requirements of this
+  specification</span>.</p>
+
+  <p>This document is probably not suited to readers who do not already have at least a passing
+  familiarity with Web technologies, as in places it sacrifices clarity for precision, and brevity
+  for completeness. More approachable tutorials and authoring guides can provide a gentler
+  introduction to the topic.</p>
+
+  <p>In particular, familiarity with the basics of DOM is necessary for a complete understanding of
+  some of the more technical parts of this specification. An understanding of Web IDL, HTTP, XML,
+  Unicode, character encodings, JavaScript, and CSS will also be helpful in places but is not
+  essential.</p>
+
+
+  <h3>Scope</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>This specification is limited to providing a semantic-level markup language and associated
+  semantic-level scripting APIs for authoring accessible pages on the Web ranging from static
+  documents to dynamic applications.</p>
+
+  <p>The scope of this specification does not include providing mechanisms for media-specific
+  customization of presentation (although default rendering rules for Web browsers are included at
+  the end of this specification, and several mechanisms for hooking into CSS are provided as part of
+  the language).</p>
+
+  <p>The scope of this specification is not to describe an entire operating system. In particular,
+  hardware configuration software, image manipulation tools, and applications that users would be
+  expected to use with high-end workstations on a daily basis are out of scope. In terms of
+  applications, this specification is targeted specifically at applications that would be expected
+  to be used by users on an occasional basis, or regularly but from disparate locations, with low
+  CPU requirements. Examples of such applications include online purchasing systems, searching
+  systems, games (especially multiplayer online games), public telephone books or address books,
+  communications software (e-mail clients, instant messaging clients, discussion software), document
+  editing software, etc.</p>
+
+
+  <h3>History</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>For its first five years (1990-1995), HTML went through a number of revisions and experienced a
+  number of extensions, primarily hosted first at CERN, and then at the IETF.</p>
+
+  <p>With the creation of the W3C, HTML's development changed venue again. A first abortive attempt
+  at extending HTML in 1995 known as HTML 3.0 then made way to a more pragmatic approach known as
+  HTML 3.2, which was completed in 1997. HTML4 quickly followed later that same year.</p>
+
+  <p>The following year, the W3C membership decided to stop evolving HTML and instead begin work on
+  an XML-based equivalent, called XHTML. <!-- http://www.w3.org/MarkUp/future/#summary --> This
+  effort started with a reformulation of HTML4 in XML, known as XHTML 1.0, which added no new
+  features except the new serialisation, and which was completed in 2000. After XHTML 1.0, the W3C's
+  focus turned to making it easier for other working groups to extend XHTML, under the banner of
+  XHTML Modularization. In parallel with this, the W3C also worked on a new language that was not
+  compatible with the earlier HTML and XHTML languages, calling it XHTML2.</p>
+
+  <p>Around the time that HTML's evolution was stopped in 1998, parts of the API for HTML developed
+  by browser vendors were specified and published under the name DOM Level 1 (in 1998) and DOM Level
+  2 Core and DOM Level 2 HTML (starting in 2000 and culminating in 2003). These efforts then petered
+  out, with some DOM Level 3 specifications published in 2004 but the working group being closed
+  before all the Level 3 drafts were completed.</p>
+
+  <p>In 2003, the publication of XForms, a technology which was positioned as the next generation of
+  Web forms, sparked a renewed interest in evolving HTML itself, rather than finding replacements
+  for it. This interest was borne from the realization that XML's deployment as a Web technology was
+  limited to entirely new technologies (like RSS and later Atom), rather than as a replacement for
+  existing deployed technologies (like HTML).</p>
+
+  <p>A proof of concept to show that it was possible to extend HTML4's forms to provide many of the
+  features that XForms 1.0 introduced, without requiring browsers to implement rendering engines
+  that were incompatible with existing HTML Web pages, was the first result of this renewed
+  interest. At this early stage, while the draft was already publicly available, and input was
+  already being solicited from all sources, the specification was only under Opera Software's
+  copyright.</p>
+
+  <p>The idea that HTML's evolution should be reopened was tested at a W3C workshop in 2004, where
+  some of the principles that underlie the HTML5 work (described below), as well as the
+  aforementioned early draft proposal covering just forms-related features, were presented to the
+  W3C jointly by Mozilla and Opera. The proposal was rejected on the grounds that the proposal
+  conflicted with the previously chosen direction for the Web's evolution; the W3C staff and
+  membership voted to continue developing XML-based replacements instead.</p>
+
+  <p>Shortly thereafter, Apple, Mozilla, and Opera jointly announced their intent to continue
+  working on the effort under the umbrella of a new venue called the WHATWG. A public mailing list
+  was created, and the draft was moved to the WHATWG site. The copyright was subsequently amended to
+  be jointly owned by all three vendors, and to allow reuse of the specification.</p>
+
+  <p>The WHATWG was based on several core principles, in particular that technologies need to be
+  backwards compatible, that specifications and implementations need to match even if this means
+  changing the specification rather than the implementations, and that specifications need to be
+  detailed enough that implementations can achieve complete interoperability without
+  reverse-engineering each other.</p>
+
+  <p>The latter requirement in particular required that the scope of the HTML5 specification include
+  what had previously been specified in three separate documents: HTML4, XHTML1, and DOM2 HTML. It
+  also meant including significantly more detail than had previously been considered the norm.</p>
+
+  <p>In 2006, the W3C indicated an interest to participate in the development of HTML5 after all,
+  and in 2007 formed a working group chartered to work with the WHATWG on the development of the
+  HTML5 specification. Apple, Mozilla, and Opera allowed the W3C to publish the specification under
+  the W3C copyright, while keeping a version with the less restrictive license on the WHATWG
+  site.</p>
+
+  <p>For a number of years, both groups then worked together. In 2011, however, the groups came to
+  the conclusion that they had different goals: the W3C wanted to publish a "finished" version of
+  "HTML5", while the WHATWG wanted to continue working on a Living Standard for HTML, continuously
+  maintaining the specification rather than freezing it in a state with known problems, and adding
+  new features as needed to evolve the platform.</p>
+
+  <p>Since then, the WHATWG has been working on this specification (amongst others), and the W3C has
+  been copying fixes made by the WHATWG into their fork of the document, as well as making other
+  changes, some intentional and some not, with no documentation listing or explaining the
+  differences.</p>
+
+
+
+  <h3>Design notes</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>It must be admitted that many aspects of HTML appear at first glance to be nonsensical and
+  inconsistent.</p>
+
+  <p>HTML, its supporting DOM APIs, as well as many of its supporting technologies, have been
+  developed over a period of several decades by a wide array of people with different priorities
+  who, in many cases, did not know of each other's existence.</p>
+
+  <p>Features have thus arisen from many sources, and have not always been designed in especially
+  consistent ways. Furthermore, because of the unique characteristics of the Web, implementation
+  bugs have often become de-facto, and now de-jure, standards, as content is often unintentionally
+  written in ways that rely on them before they can be fixed.</p>
+
+  <p>Despite all this, efforts have been made to adhere to certain design goals. These are described
+  in the next few subsections.</p>
+
+
+
+  <h4>Serializability of script execution</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>To avoid exposing Web authors to the complexities of multithreading, the HTML and DOM APIs are
+  designed such that no script can ever detect the simultaneous execution of other scripts. Even
+  with <span data-x="Worker">workers</span>, the intent is that the behavior of implementations can
+  be thought of as completely serializing the execution of all scripts in all <span data-x="browsing
+  context">browsing contexts</span>.</p>
+
+  <p class="note">The <code
+  data-x="dom-navigator-yieldForStorageUpdates">navigator.yieldForStorageUpdates()</code> method, in
+  this model, is equivalent to allowing other scripts to run while the calling script is
+  blocked.</p>
+
+
+
+  <h4>Compliance with other specifications</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>This specification interacts with and relies on a wide variety of other specifications. In
+  certain circumstances, unfortunately, conflicting needs have led to this specification violating
+  the requirements of these other specifications. Whenever this has occurred, the transgressions
+  have each been noted as a "<dfn>willful violation</dfn>", and the reason for the violation has
+  been noted.</p>
+
+
+
+  <h4>Extensibility</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>HTML has a wide array of extensibility mechanisms that can be used for adding semantics in a
+  safe manner:</p>
+
+  <ul>
+
+   <li><p>Authors can use the <code data-x="attr-class">class</code> attribute to extend elements,
+   effectively creating their own elements, while using the most applicable existing "real" HTML
+   element, so that browsers and other tools that don't know of the extension can still support it
+   somewhat well. This is the tack used by microformats, for example.</p></li>
+
+   <li><p>Authors can include data for inline client-side scripts or server-side site-wide scripts
+   to process using the <code data-x="attr-data-*">data-*=""</code> attributes. These are guaranteed
+   to never be touched by browsers, and allow scripts to include data on HTML elements that scripts
+   can then look for and process.</p></li>
+
+   <li><p>Authors can use the <code data-x="meta">&lt;meta name="" content=""></code> mechanism to
+   include page-wide metadata by registering <span data-x="concept-meta-extensions">extensions to
+   the predefined set of metadata names</span>.</p></li>
+
+   <li><p>Authors can use the <code data-x="attr-hyperlink-rel">rel=""</code> mechanism to annotate
+   links with specific meanings by registering <span data-x="concept-rel-extensions">extensions to
+   the predefined set of link types</span>. This is also used by microformats.</p></li>
+
+   <li><p>Authors can embed raw data using the <code data-x="script">&lt;script type=""></code>
+   mechanism with a custom type, for further handling by inline or server-side scripts.</p></li>
+
+   <li><p>Authors can create <span data-x="plugin">plugins</span> and invoke them using the
+   <code>embed</code> element. This is how Flash works.</p></li>
+
+   <li><p>Authors can extend APIs using the JavaScript prototyping mechanism. This is widely used by
+   script libraries, for instance.</p></li>
+
+   <li><p>Authors can use the microdata feature (the <code
+   data-x="attr-itemscope">itemscope=""</code> and <code data-x="attr-itemprop">itemprop=""</code>
+   attributes) to embed nested name-value pairs of data to be shared with other applications and
+   sites.</p></li>
+
+  </ul>
+
+
+
+
+  <h3>HTML vs XHTML</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>This specification defines an abstract language for describing documents and applications, and
+  some APIs for interacting with in-memory representations of resources that use this language.</p>
+
+  <p>The in-memory representation is known as "DOM HTML", or "the DOM" for short.</p>
+
+  <p>There are various concrete syntaxes that can be used to transmit resources that use this
+  abstract language, two of which are defined in this specification.</p>
+
+  <p>The first such concrete syntax is the HTML syntax. This is the format suggested for most
+  authors. It is compatible with most legacy Web browsers. If a document is transmitted with the
+  <code>text/html</code> <span>MIME type</span>, then it will be processed as an HTML document by
+  Web browsers. This specification defines the latest HTML syntax, known simply as "HTML".</p>
+
+  <p>The second concrete syntax is the XHTML syntax, which is an application of XML. When a document
+  is transmitted with an <span>XML MIME type</span>, such as <code>application/xhtml+xml</code>,
+  then it is treated as an XML document by Web browsers, to be parsed by an XML processor. Authors
+  are reminded that the processing for XML and HTML differs; in particular, even minor syntax errors
+  will prevent a document labeled as XML from being rendered fully, whereas they would be ignored in
+  the HTML syntax. This specification defines the latest XHTML syntax, known simply as "XHTML".</p>
+
+  <p>The DOM, the HTML syntax, and the XHTML syntax cannot all represent the same content. For
+  example, namespaces cannot be represented using the HTML syntax, but they are supported in the DOM
+  and in the XHTML syntax. Similarly, documents that use the <code>noscript</code> feature can be
+  represented using the HTML syntax, but cannot be represented with the DOM or in the XHTML syntax.
+  Comments that contain the string "<code data-x="">--&gt;</code>" can only be represented in the
+  DOM, not in the HTML and XHTML syntaxes.</p>
+
+
+  <h3>Structure of this specification</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>This specification is divided into the following major sections:</p>
+
+  <dl>
+
+
+   <dt><a href="#introduction">Introduction</a></dt>
+
+   <dd>Non-normative materials providing a context for the HTML standard.</dd>
+
+
+   <dt><a href="#infrastructure">Common infrastructure</a></dt>
+
+   <dd>The conformance classes, algorithms, definitions, and the common underpinnings of the rest of
+   the specification.</dd>
+
+
+   <dt><a href="#dom">Semantics, structure, and APIs of HTML documents</a></dt>
+
+   <dd>Documents are built from elements. These elements form a tree using the DOM. This section
+   defines the features of this DOM, as well as introducing the features common to all elements, and
+   the concepts used in defining elements.</dd>
+
+
+   <dt><a href="#semantics">The elements of HTML</a></dt>
+
+   <dd>Each element has a predefined meaning, which is explained in this section. Rules for authors
+   on how to use the element<span class="nodev">, along with user agent requirements for how to
+   handle each element,</span> are also given. This includes large signature features of HTML such
+   as video playback and subtitles, form controls and form submission, and a 2D graphics API known
+   as the HTML canvas.</dd>
+
+
+   <dt><a href="#microdata">Microdata</a></dt>
+
+   <dd>This specification introduces a mechanism for adding machine-readable annotations to
+   documents, so that tools can extract trees of name-value pairs from the document. This section
+   describes this mechanism<span class="nodev"> and some algorithms that can be used to convert HTML
+   documents into other formats</span>. This section also defines some sample Microdata vocabularies
+   for contact information, calendar events, and licensing works.</dd>
+
+
+   <dt><a href="#editing">User interaction</a></dt>
+
+   <dd>HTML documents can provide a number of mechanisms for users to interact with and modify
+   content, which are described in this section, such as how focus works, and drag-and-drop.</dd>
+
+
+   <dt><a href="#browsers">Loading Web pages</a></dt>
+
+   <dd>HTML documents do not exist in a vacuum &mdash; this section defines many of the features
+   that affect environments that deal with multiple pages, such as Web browsers and offline
+   caching of Web applications.</dd>
+
+
+   <dt><a href="#webappapis">Web application APIs</a></dt>
+
+   <dd>This section introduces basic features for scripting of applications in HTML.</dd>
+
+
+   <dt><a href="#workers">Web workers</a></dt>
+
+   <dd>This section defines an API for background threads in JavaScript.</dd>
+
+
+   <dt><a href="#comms">The communication APIs</a></dt>
+
+   <dd>This section describes some mechanisms that applications written in HTML can use to
+   communicate with other applications from different domains running on the same client. It also
+   introduces a server-push event stream mechanism known as Server Sent Events or
+   <code>EventSource</code>, and a two-way full-duplex socket protocol for scripts known as Web
+   Sockets.
+
+   </dd>
+
+
+   <dt><a href="#webstorage">Web storage</a></dt>
+
+   <dd>This section defines a client-side storage mechanism based on name-value pairs.</dd>
+
+
+   <dt><a href="#syntax">The HTML syntax</a></dt>
+   <dt><a href="#xhtml">The XHTML syntax</a></dt>
+
+   <dd>All of these features would be for naught if they couldn't be represented in a serialized
+   form and sent to other people, and so these sections define the syntaxes of HTML and XHTML<span
+   class="nodev">, along with rules for how to parse content using those syntaxes</span>.</dd>
+
+
+   <dt><a href="#rendering">Rendering</a></dt>
+
+   <dd>This section defines the default rendering rules for Web browsers.</dd>
+
+
+  </dl>
+
+  <p>There are also some appendices, listing <a href="#obsolete">obsolete features</a> and <a
+  href="#iana">IANA considerations</a>, and several indices.</p>
+
+
+
+  <h4>How to read this specification</h4>
+
+  <p>This specification should be read like all other specifications. First, it should be read
+  cover-to-cover, multiple times. Then, it should be read backwards at least once. Then it should be
+  read by picking random sections from the contents list and following all the cross-references.</p>
+
+  <p>As described in the conformance requirements section below, this specification describes
+  conformance criteria for a variety of conformance classes. In particular, there are conformance
+  requirements that apply to <em>producers</em>, for example authors and the documents they create,
+  and there are conformance requirements that apply to <em>consumers</em>, for example Web browsers.
+  They can be distinguished by what they are requiring: a requirement on a producer states what is
+  allowed, while a requirement on a consumer states how software is to act.</p>
+
+  <div class="example">
+
+   <p>For example, "the <code data-x="">foo</code> attribute's value must be a <span>valid
+   integer</span>" is a requirement on producers, as it lays out the allowed values; in contrast,
+   the requirement "the <code data-x="">foo</code> attribute's value must be parsed using the
+   <span>rules for parsing integers</span>" is a requirement on consumers, as it describes how to
+   process the content.</p>
+
+  </div>
+
+  <p><strong>Requirements on producers have no bearing whatsoever on consumers.</strong></p>
+
+  <div class="example">
+
+   <p>Continuing the above example, a requirement stating that a particular attribute's value is
+   constrained to being a <span>valid integer</span> emphatically does <em>not</em> imply anything
+   about the requirements on consumers. It might be that the consumers are in fact required to treat
+   the attribute as an opaque string, completely unaffected by whether the value conforms to the
+   requirements or not. It might be (as in the previous example) that the consumers are required to
+   parse the value using specific rules that define how invalid (non-numeric in this case) values
+   are to be processed.</p>
+
+  </div>
+
+
+
+  <h4>Typographic conventions</h4>
+
+  <p>This is a definition, requirement, or explanation.</p>
+
+  <p class="note">This is a note.</p>
+
+  <p class="example">This is an example.</p>
+
+  <p class="&#x0058;&#x0058;&#x0058;">This is an open issue.</p>
+
+  <p class="warning">This is a warning.</p>
+
+  <pre class="idl extract">interface <dfn data-x="">Example</dfn> {
+  // this is an IDL definition
+};</pre>
+
+  <dl class="domintro">
+
+   <dt><var data-x="">variable</var> = <var data-x="">object</var> . <code data-x="">method</code>( [ <var data-x="">optionalArgument</var> ] )</dt>
+
+   <dd>
+
+    <p>This is a note to authors describing the usage of an interface.</p>
+
+   </dd>
+
+  </dl>
+
+  <pre class="css">/* this is a CSS fragment */</pre>
+
+  <p>The defining instance of a term is marked up like <dfn data-x="x-this">this</dfn>. Uses of that
+  term are marked up like <span data-x="x-this">this</span> or like <i data-x="x-this">this</i>.</p>
+
+  <p>The defining instance of an element, attribute, or API is marked up like <dfn
+  data-x="x-that"><code>this</code></dfn>. References to that element, attribute, or API are marked
+  up like <code data-x="x-that">this</code>.</p>
+
+  <p>Other code fragments are marked up <code data-x="">like this</code>.</p>
+
+  <p>Variables are marked up like <var data-x="">this</var>.</p>
+
+  <p>In an algorithm, steps in <span data-x="synchronous section">synchronous sections</span> are
+  marked with &#x231B;.</p>
+
+  <p>In some cases, requirements are given in the form of lists with conditions and corresponding
+  requirements. In such cases, the requirements that apply to a condition are always the first set
+  of requirements that follow the condition, even in the case of there being multiple sets of
+  conditions for those requirements. Such cases are presented as follows:</p>
+
+  <dl class="switch">
+
+   <dt>This is a condition
+   <dt>This is another condition
+   <dd>This is the requirement that applies to the conditions above.
+
+   <dt>This is a third condition
+   <dd>This is the requirement that applies to the third condition.
+
+  </dl>
+
+
+
+  <h3 id="fingerprint">Privacy concerns</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>Some features of HTML trade user convenience for a measure of user privacy.</p>
+
+  <p>In general, due to the Internet's architecture, a user can be distinguished from another by the
+  user's IP address. IP addresses do not perfectly match to a user; as a user moves from device to
+  device, or from network to network, their IP address will change; similarly, NAT routing, proxy
+  servers, and shared computers enable packets that appear to all come from a single IP address to
+  actually map to multiple users. Technologies such as onion routing can be used to further
+  anonymise requests so that requests from a single user at one node on the Internet appear to come
+  from many disparate parts of the network.</p>
+
+  <p>However, the IP address used for a user's requests is not the only mechanism by which a user's
+  requests could be related to each other. Cookies, for example, are designed specifically to enable
+  this, and are the basis of most of the Web's session features that enable you to log into a site
+  with which you have an account.</p>
+
+  <p>There are other mechanisms that are more subtle. Certain characteristics of a user's system can
+  be used to distinguish groups of users from each other; by collecting enough such information, an
+  individual user's browser's "digital fingerprint" can be computed, which can be as good, if not
+  better, as an IP address in ascertaining which requests are from the same user.</p>
+
+  <p>Grouping requests in this manner, especially across multiple sites, can be used for both benign
+  (and even arguably positive) purposes, as well as for malevolent purposes. An example of a
+  reasonably benign purpose would be determining whether a particular person seems to prefer sites
+  with dog illustrations as opposed to sites with cat illustrations (based on how often they visit
+  the sites in question) and then automatically using the preferred illustrations on subsequent
+  visits to participating sites. Malevolent purposes, however, could include governments combining
+  information such as the person's home address (determined from the addresses they use when getting
+  driving directions on one site) with their apparent political affiliations (determined by
+  examining the forum sites that they participate in) to determine whether the person should be
+  prevented from voting in an election.</p>
+
+  <p>Since the malevolent purposes can be remarkably evil, user agent implementors are encouraged to
+  consider how to provide their users with tools to minimise leaking information that could be used
+  to fingerprint a user.</p>
+
+  <p>Unfortunately, as the first paragraph in this section implies, sometimes there is great benefit
+  to be derived from exposing the very information that can also be used for fingerprinting
+  purposes, so it's not as easy as simply blocking all possible leaks. For instance, the ability to
+  log into a site to post under a specific identity requires that the user's requests be
+  identifiable as all being from the same user, more or less by definition. More subtly, though,
+  information such as how wide text is, which is necessary for many effects that involve drawing
+  text onto a canvas (e.g. any effect that involves drawing a border around the text) also leaks
+  information that can be used to group a user's requests. (In this case, by potentially exposing,
+  via a brute force search, which fonts a user has installed, information which can vary
+  considerably from user to user.)</p>
+
+  <p>Features in this specification which can be <dfn data-x="fingerprinting vector">used to
+  fingerprint the user</dfn> are marked as this paragraph is.
+  <!--INSERT FINGERPRINT-->
+  </p>
+
+  <p>Other features in the platform can be used for the same purpose, though, including, though not
+  limited to:</p>
+
+  <ul>
+
+   <li>The exact list of which features a user agents supports.</li>
+
+   <li>The maximum allowed stack depth for recursion in script.</li>
+
+   <li>Features that describe the user's environment, like Media Queries and the <code>Screen</code>
+   object. <a href="#refsMQ">[MQ]</a> <a href="#refsCSSOMVIEW">[CSSOMVIEW]</a></li>
+
+   <li>The user's time zone.</li>
+
+  </ul>
+
+
+
+  <h3>A quick introduction to HTML</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>A basic HTML document looks like this:</p>
+
+  <pre id="intro-early-example">&lt;!DOCTYPE html>
+&lt;html>
+ &lt;head>
+  &lt;title>Sample page&lt;/title>
+ &lt;/head>
+ &lt;body>
+  &lt;h1>Sample page&lt;/h1>
+  &lt;p>This is a &lt;a href="demo.html">simple&lt;/a> sample.&lt;/p>
+  &lt;!-- this is a comment -->
+ &lt;/body>
+&lt;/html></pre>
+
+  <p>HTML documents consist of a tree of elements and text. Each element is denoted in the source by
+  a <span data-x="syntax-start-tag">start tag</span>, such as "<code data-x="">&lt;body></code>", and
+  an <span data-x="syntax-end-tag">end tag</span>, such as "<code data-x="">&lt;/body></code>".
+  (Certain start tags and end tags can in certain cases be <span
+  data-x="syntax-tag-omission">omitted</span> and are implied by other tags.)</p>
+
+  <p>Tags have to be nested such that elements are all completely within each other, without
+  overlapping:</p>
+
+  <pre class="bad">&lt;p>This is &lt;em>very &lt;strong>wrong&lt;/em>!&lt;/strong>&lt;/p></pre>
+  <pre>&lt;p>This &lt;em>is &lt;strong>correct&lt;/strong>.&lt;/em>&lt;/p></pre>
+
+  <p>This specification defines a set of elements that can be used in HTML, along with rules about
+  the ways in which the elements can be nested.</p>
+
+  <p>Elements can have attributes, which control how the elements work. In the example below, there
+  is a <span>hyperlink</span>, formed using the <code>a</code> element and its <code
+  data-x="attr-hyperlink-href">href</code> attribute:</p>
+
+  <pre>&lt;a href="demo.html">simple&lt;/a></pre>
+
+  <p><span data-x="syntax-attributes">Attributes</span> are placed inside the start tag, and consist
+  of a <span data-x="syntax-attribute-name">name</span> and a <span
+  data-x="syntax-attribute-value">value</span>, separated by an "<code data-x="">=</code>" character.
+  The attribute value can remain <a href="#unquoted">unquoted</a> if it doesn't contain <span
+  data-x="space character">space characters</span> or any of <code data-x="">"</code> <code
+  data-x="">'</code> <code data-x="">`</code> <code data-x="">=</code> <code data-x="">&lt;</code> or
+  <code data-x="">&gt;</code>. Otherwise, it has to be quoted using either single or double quotes.
+  The value, along with the "<code data-x="">=</code>" character, can be omitted altogether if the
+  value is the empty string.</p>
+
+  <pre>&lt;!-- empty attributes -->
+&lt;input name=address disabled>
+&lt;input name=address disabled="">
+
+&lt;!-- attributes with a value -->
+&lt;input name=address maxlength=200>
+&lt;input name=address maxlength='200'>
+&lt;input name=address maxlength="200"></pre>
+
+  <p>HTML user agents (e.g. Web browsers) then <i>parse</i> this markup, turning it into a DOM
+  (Document Object Model) tree. A DOM tree is an in-memory representation of a document.</p>
+
+  <p>DOM trees contain several kinds of nodes, in particular a <code>DocumentType</code> node,
+  <code>Element</code> nodes, <code>Text</code> nodes, <code>Comment</code> nodes, and in some cases
+  <code>ProcessingInstruction</code> nodes.</p>
+
+  <p>The <a href="#intro-early-example">markup snippet at the top of this section</a> would be
+  turned into the following DOM tree:</p>
+
+  <ul class="domTree"><li class="t10">DOCTYPE: <code data-x="">html</code></li><li class="t1"><code>html</code><ul><li class="t1"><code>head</code><ul><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;&#x2423;</span></li><li class="t1"><code>title</code><ul><li class="t3"><code>#text</code>: <span data-x="">Sample page</span></li></ul></li><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;</span></li></ul></li><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;</span></li><li class="t1"><code>body</code><ul><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;&#x2423;</span></li><li class="t1"><code>h1</code><ul><li class="t3"><code>#text</code>: <span data-x="">Sample page</span></li></ul></li><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;&#x2423;</span></li><li class="t1"><code>p</code><ul><li class="t3"><code>#text</code>: <span data-x="">This is a <!--grammar-check-override--></span></li><li class="t1"><code>a</code> <span data-x="" class="t2"><code class="attribute name">href</code>="<code class="attribute value">demo.html</code>"</span><ul><li class="t3"><code>#text</code>: <span data-x="">simple</span></li></ul></li><li class="t3"><code>#text</code>: <span data-x=""> sample.</span></li></ul></li><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;&#x2423;</span></li><li class="t8"><code>#comment</code>: <span data-x=""> this is a comment </span></li><li class="t3"><code>#text</code>: <span data-x="">&#x23CE;&#x2423;&#x23CE;</span></li></ul></li></ul></li></ul>
+
+  <p>The <span>root element</span> of this tree is the <code>html</code> element, which is the
+  element always found at the root of HTML documents. It contains two elements, <code>head</code>
+  and <code>body</code>, as well as a <code>Text</code> node between them.</p>
+
+  <p>There are many more <code>Text</code> nodes in the DOM tree than one would initially expect,
+  because the source contains a number of spaces (represented here by "&#x2423;") and line breaks
+  ("&#x23CE;") that all end up as <code>Text</code> nodes in the DOM. However, for historical
+  reasons not all of the spaces and line breaks in the original markup appear in the DOM. In
+  particular, all the whitespace before <code>head</code> start tag ends up being dropped silently,
+  and all the whitespace after the <code>body</code> end tag ends up placed at the end of the
+  <code>body</code>.</p>
+
+  <p>The <code>head</code> element contains a <code>title</code> element, which itself contains a
+  <code>Text</code> node with the text "Sample page". Similarly, the <code>body</code> element
+  contains an <code>h1</code> element, a <code>p</code> element, and a comment.</p>
+
+  <hr>
+
+  <p>This DOM tree can be manipulated from scripts in the page. Scripts (typically in JavaScript)
+  are small programs that can be embedded using the <code>script</code> element or using <span>event
+  handler content attributes</span>. For example, here is a form with a script that sets the value
+  of the form's <code>output</code> element to say "Hello World":</p>
+
+  <pre>&lt;<span>form</span> <span data-x="attr-form-name">name</span>="main">
+ Result: &lt;<span>output</span> <span data-x="attr-fe-name">name</span>="result">&lt;/output>
+ &lt;<span>script</span>>
+  <span data-x="Document">document</span>.<span data-x="dom-document-forms">forms</span>.main.<span data-x="dom-form-elements">elements</span>.result.<span data-x="dom-output-value">value</span> = 'Hello World';
+ &lt;/script>
+&lt;/form></pre>
+
+  <p>Each element in the DOM tree is represented by an object, and these objects have APIs so that
+  they can be manipulated. For instance, a link (e.g. the <code>a</code> element in the tree above)
+  can have its "<code data-x="attr-hyperlink-href">href</code>" attribute changed in several
+  ways:</p>
+
+  <pre>var a = <span data-x="Document">document</span>.<span data-x="dom-document-links">links</span>[0]; // obtain the first link in the document
+a.<span data-x="dom-url-href">href</span> = 'sample.html'; // change the destination URL of the link
+a.<span data-x="dom-url-protocol">protocol</span> = 'https'; // change just the scheme part of the URL
+a.setAttribute('href', 'http://example.com/'); // change the content attribute directly</pre>
+
+  <p>Since DOM trees are used as the way to represent HTML documents when they are processed and
+  presented by implementations (especially interactive implementations like Web browsers), this
+  specification is mostly phrased in terms of DOM trees, instead of the markup described above.</p>
+
+  <hr>
+
+  <p>HTML documents represent a media-independent description of interactive content. HTML documents
+  might be rendered to a screen, or through a speech synthesiser, or on a braille display. To
+  influence exactly how such rendering takes place, authors can use a styling language such as
+  CSS.</p>
+
+  <p>In the following example, the page has been made yellow-on-blue using CSS.</p>
+
+  <pre>&lt;!DOCTYPE html>
+&lt;html>
+ &lt;head>
+  &lt;title>Sample styled page&lt;/title>
+  &lt;style>
+   body { background: navy; color: yellow; }
+  &lt;/style>
+ &lt;/head>
+ &lt;body>
+  &lt;h1>Sample styled page&lt;/h1>
+  &lt;p>This page is just a demo.&lt;/p>
+ &lt;/body>
+&lt;/html></pre>
+
+  <p>For more details on how to use HTML, authors are encouraged to consult tutorials and guides.
+  Some of the examples included in this specification might also be of use, but the novice author is
+  cautioned that this specification, by necessity, defines the language with a level of detail that
+  might be difficult to understand at first.</p>
+
+
+
+<!--ADD-TOPIC:Security-->
+  <h4>Writing secure applications with HTML</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>When HTML is used to create interactive sites, care needs to be taken to avoid introducing
+  vulnerabilities through which attackers can compromise the integrity of the site itself or of the
+  site's users.</p>
+
+  <p>A comprehensive study of this matter is beyond the scope of this document, and authors are
+  strongly encouraged to study the matter in more detail. However, this section attempts to provide
+  a quick introduction to some common pitfalls in HTML application development.</p>
+
+  <p>The security model of the Web is based on the concept of "origins", and correspondingly many of
+  the potential attacks on the Web involve cross-origin actions. <a
+  href="#refsORIGIN">[ORIGIN]</a></p>
+
+  <dl>
+
+   <dt>Not validating user input</dt>
+   <dt>Cross-site scripting (XSS)</dt>
+   <dt>SQL injection</dt>
+
+   <dd>
+
+    <p>When accepting untrusted input, e.g. user-generated content such as text comments, values in
+    URL parameters, messages from third-party sites, etc, it is imperative that the data be
+    validated before use, and properly escaped when displayed. Failing to do this can allow a
+    hostile user to perform a variety of attacks, ranging from the potentially benign, such as
+    providing bogus user information like a negative age, to the serious, such as running scripts
+    every time a user looks at a page that includes the information, potentially propagating the
+    attack in the process, to the catastrophic, such as deleting all data in the server.</p>
+
+    <p>When writing filters to validate user input, it is imperative that filters always be
+    whitelist-based, allowing known-safe constructs and disallowing all other input. Blacklist-based
+    filters that disallow known-bad inputs and allow everything else are not secure, as not
+    everything that is bad is yet known (for example, because it might be invented in the
+    future).</p>
+
+    <div class="example">
+
+     <p>For example, suppose a page looked at its URL's query string to determine what to display,
+     and the site then redirected the user to that page to display a message, as in:</p>
+
+     <pre>&lt;ul>
+ &lt;li>&lt;a href="message.cgi?say=Hello">Say Hello&lt;/a>
+ &lt;li>&lt;a href="message.cgi?say=Welcome">Say Welcome&lt;/a>
+ &lt;li>&lt;a href="message.cgi?say=Kittens">Say Kittens&lt;/a>
+&lt;/ul></pre>
+
+     <p>If the message was just displayed to the user without escaping, a hostile attacker could
+     then craft a URL that contained a script element:</p>
+
+     <pre>http://example.com/message.cgi?say=%3Cscript%3Ealert%28%27Oh%20no%21%27%29%3C/script%3E</pre>
+
+     <p>If the attacker then convinced a victim user to visit this page, a script of the attacker's
+     choosing would run on the page. Such a script could do any number of hostile actions, limited
+     only by what the site offers: if the site is an e-commerce shop, for instance, such a script
+     could cause the user to unknowingly make arbitrarily many unwanted purchases.</p>
+
+     <p>This is called a cross-site scripting attack.</p>
+
+    </div>
+
+    <p>There are many constructs that can be used to try to trick a site into executing code. Here
+    are some that authors are encouraged to consider when writing whitelist filters:</p>
+
+    <ul>
+
+     <li>When allowing harmless-seeming elements like <code>img</code>, it is important to whitelist
+     any provided attributes as well. If one allowed all attributes then an attacker could, for
+     instance, use the <code data-x="handler-onload">onload</code> attribute to run arbitrary
+     script.</li>
+
+     <li>When allowing URLs to be provided (e.g. for links), the scheme of each URL also needs to be
+     explicitly whitelisted, as there are many schemes that can be abused. The most prominent
+     example is "<code data-x="javascript-protocol">javascript:</code>", but user agents can
+     implement (and indeed, have historically implemented) others.</li> <!-- IE had vbscript:,
+     Netscape had livescript:, etc. -->
+
+     <li>Allowing a <code>base</code> element to be inserted means any <code>script</code> elements
+     in the page with relative links can be hijacked, and similarly that any form submissions can
+     get redirected to a hostile site.</li>
+
+    </ul>
+
+   </dd>
+
+
+   <dt>Cross-site request forgery (CSRF)</dt>
+
+   <dd>
+
+    <p>If a site allows a user to make form submissions with user-specific side-effects, for example
+    posting messages on a forum under the user's name, making purchases, or applying for a passport,
+    it is important to verify that the request was made by the user intentionally, rather than by
+    another site tricking the user into making the request unknowingly.</p>
+
+    <p>This problem exists because HTML forms can be submitted to other origins.</p>
+
+    <p>Sites can prevent such attacks by populating forms with user-specific hidden tokens, or by
+    checking <code data-x="http-origin">Origin</code> headers on all requests.</p>
+
+   </dd>
+
+
+
+   <dt>Clickjacking</dt>
+
+   <dd>
+
+    <p>A page that provides users with an interface to perform actions that the user might not wish
+    to perform needs to be designed so as to avoid the possibility that users can be tricked into
+    activating the interface.</p>
+
+    <p>One way that a user could be so tricked is if a hostile site places the victim site in a
+    small <code>iframe</code> and then convinces the user to click, for instance by having the user
+    play a reaction game. Once the user is playing the game, the hostile site can quickly position
+    the iframe under the mouse cursor just as the user is about to click, thus tricking the user
+    into clicking the victim site's interface.</p>
+
+    <p>To avoid this, sites that do not expect to be used in frames are encouraged to only enable
+    their interface if they detect that they are not in a frame (e.g. by comparing the <code
+    data-x="dom-window">window</code> object to the value of the <code data-x="dom-top">top</code>
+    attribute).</p>
+
+   </dd>
+
+  </dl>
+<!--REMOVE-TOPIC:Security-->
+
+
+  <h4>Common pitfalls to avoid when using the scripting APIs</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>Scripts in HTML have "run-to-completion" semantics, meaning that the browser will generally run
+  the script uninterrupted before doing anything else, such as firing further events or continuing
+  to parse the document.</p>
+
+  <p>On the other hand, parsing of HTML files happens asynchronously and incrementally, meaning that
+  the parser can pause at any point to let scripts run. This is generally a good thing, but it does
+  mean that authors need to be careful to avoid hooking event handlers after the events could have
+  possibly fired.</p>
+
+  <p>There are two techniques for doing this reliably: use <span>event handler content
+  attributes</span>, or create the element and add the event handlers in the same script. The latter
+  is safe because, as mentioned earlier, scripts are run to completion before further events can
+  fire.</p>
+
+  <div class="example">
+
+   <p>One way this could manifest itself is with <code>img</code> elements and the <code
+   data-x="event-load">load</code> event. The event could fire as soon as the element has been
+   parsed, especially if the image has already been cached (which is common).</p>
+
+   <p>Here, the author uses the <code data-x="handler-onload">onload</code> handler on an
+   <code>img</code> element to catch the <code data-x="event-load">load</code> event:</p>
+
+   <pre>&lt;img src="games.png" alt="Games" onload="gamesLogoHasLoaded(event)"></pre>
+
+   <p>If the element is being added by script, then so long as the event handlers are added in the
+   same script, the event will still not be missed:</p>
+
+   <pre>&lt;script>
+ var img = new Image();
+ img.src = 'games.png';
+ img.alt = 'Games';
+ img.onload = gamesLogoHasLoaded;
+ // img.addEventListener('load', gamesLogoHasLoaded, false); // would work also
+&lt;/script></pre>
+
+   <p>However, if the author first created the <code>img</code> element and then in a separate
+   script added the event listeners, there's a chance that the <code data-x="event-load">load</code>
+   event would be fired in between, leading it to be missed:</p>
+
+   <pre class="bad">&lt;!-- Do not use this style, it has a race condition! -->
+ &lt;img id="games" src="games.png" alt="Games">
+ &lt;!-- the 'load' event might fire here while the parser is taking a
+      break, in which case you will not see it! -->
+ &lt;script>
+  var img = document.getElementById('games');
+  img.onload = gamesLogoHasLoaded; // might never fire!
+ &lt;/script></pre>
+
+  </div>
+
+
+
+  <h4>How to catch mistakes when writing HTML: validators and conformance checkers</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>Authors are encouraged to make use of conformance checkers (also known as <i>validators</i>) to
+  catch common mistakes. The WHATWG maintains a list of such tools at: <a
+  href="http://validator.whatwg.org/">http://validator.whatwg.org/</a></p>
+
+
+
+  <h3>Conformance requirements for authors</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>Unlike previous versions of the HTML specification, this specification defines in some detail
+  the required processing for invalid documents as well as valid documents.</p> <!-- This has led to
+  some questioning the purpose of conformance criteria: if there is no ambiguity in how something
+  will be processed, why disallow it? -->
+
+  <p>However, even though the processing of invalid content is in most cases well-defined,
+  conformance requirements for documents are still important: in practice, interoperability (the
+  situation in which all implementations process particular content in a reliable and identical or
+  equivalent way) is not the only goal of document conformance requirements. This section details
+  some of the more common reasons for still distinguishing between a conforming document and one
+  with errors.</p>
+
+
+  <h4>Presentational markup</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>The majority of presentational features from previous versions of HTML are no longer allowed.
+  Presentational markup in general has been found to have a number of problems:</p>
+
+  <dl>
+
+   <dt>The use of presentational elements leads to poorer accessibility</dt>
+
+   <dd>
+
+    <p>While it is possible to use presentational markup in a way that provides users of assistive
+    technologies (ATs) with an acceptable experience (e.g. using ARIA), doing so is significantly
+    more difficult than doing so when using semantically-appropriate markup. Furthermore, even using
+    such techniques doesn't help make pages accessible for non-AT non-graphical users, such as users
+    of text-mode browsers.</p>
+
+    <p>Using media-independent markup, on the other hand, provides an easy way for documents to be
+    authored in such a way that they work for more users (e.g. text browsers).</p>
+
+   </dd>
+
+
+   <dt>Higher cost of maintenance</dt>
+
+   <dd>
+
+    <p>It is significantly easier to maintain a site written in such a way that the markup is
+    style-independent. For example, changing the colour of a site that uses
+    <code>&lt;font&nbsp;color=""></code> throughout requires changes across the entire site, whereas
+    a similar change to a site based on CSS can be done by changing a single file.</p>
+
+   </dd>
+
+
+   <dt>Larger document sizes</dt>
+
+   <dd>
+
+    <p>Presentational markup tends to be much more redundant, and thus results in larger document
+    sizes.</p>
+
+   </dd>
+
+  </dl>
+
+  <p>For those reasons, presentational markup has been removed from HTML in this version. This
+  change should not come as a surprise; HTML4 deprecated presentational markup many years ago and
+  provided a mode (HTML4 Transitional) to help authors move away from presentational markup; later,
+  XHTML 1.1 went further and obsoleted those features altogether.</p>
+
+  <p>The only remaining presentational markup features in HTML are the <code
+  data-x="attr-style">style</code> attribute and the <code>style</code> element. Use of the <code
+  data-x="attr-style">style</code> attribute is somewhat discouraged in production environments, but
+  it can be useful for rapid prototyping (where its rules can be directly moved into a separate
+  style sheet later) and for providing specific styles in unusual cases where a separate style sheet
+  would be inconvenient. Similarly, the <code>style</code> element can be useful in syndication or
+  for page-specific styles, but in general an external style sheet is likely to be more convenient
+  when the styles apply to multiple pages.</p>
+
+  <p>It is also worth noting that some elements that were previously presentational have been
+  redefined in this specification to be media-independent: <code>b</code>, <code>i</code>,
+  <code>hr</code>, <code>s</code>, <code>small</code>, and <code>u</code>.</p>
+
+
+  <h4>Syntax errors</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>The syntax of HTML is constrained to avoid a wide variety of problems.</p>
+
+  <dl>
+
+   <dt>Unintuitive error-handling behavior</dt>
+
+   <dd>
+
+    <p>Certain invalid syntax constructs, when parsed, result in DOM trees that are highly
+    unintuitive.</p>
+
+    <div class="example">
+
+     <p>For example, the following markup fragment results in a DOM with an <code>hr</code> element
+     that is an <em>earlier</em> sibling of the corresponding <code>table</code> element:</p>
+
+     <pre class="bad">&lt;table>&lt;hr>...</pre>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Errors with optional error recovery</dt>
+
+   <dd>
+
+    <p>To allow user agents to be used in controlled environments without having to implement the
+    more bizarre and convoluted error handling rules, user agents are permitted to fail whenever
+    encountering a <span>parse error</span>.</p>
+
+   </dd>
+
+
+   <dt>Errors where the error-handling behavior is not compatible with streaming user agents</dt>
+
+   <dd>
+
+    <p>Some error-handling behavior, such as the behavior for the <code
+    data-x="">&lt;table>&lt;hr>...</code> example mentioned above, are incompatible with streaming
+    user agents (user agents that process HTML files in one pass, without storing state). To avoid
+    interoperability problems with such user agents, any syntax resulting in such behavior is
+    considered invalid.</p>
+
+   </dd>
+
+
+   <dt>Errors that can result in infoset coercion</dt>
+
+   <dd>
+
+    <p>When a user agent based on XML is connected to an HTML parser, it is possible that certain
+    invariants that XML enforces, such as comments never containing two consecutive hyphens, will be
+    violated by an HTML file. Handling this can require that the parser coerce the HTML DOM into an
+    XML-compatible infoset. Most syntax constructs that require such handling are considered
+    invalid.</p>
+
+   </dd>
+
+
+   <dt>Errors that result in disproportionally poor performance</dt>
+
+   <dd>
+
+    <p>Certain syntax constructs can result in disproportionally poor performance. To discourage the
+    use of such constructs, they are typically made non-conforming.</p>
+
+    <div class="example">
+
+     <p>For example, the following markup results in poor performance, since all the unclosed
+     <code>i</code> elements have to be reconstructed in each paragraph, resulting in progressively
+     more elements in each paragraph:</p>
+
+     <pre class="bad">&lt;p>&lt;i>He dreamt.
+&lt;p>&lt;i>He dreamt that he ate breakfast.
+&lt;p>&lt;i>Then lunch.
+&lt;p>&lt;i>And finally dinner.</pre>
+
+     <p>The resulting DOM for this fragment would be:</p>
+
+     <ul class="domTree"><li class="t1"><code>p</code><ul><li class="t1"><code>i</code><ul><li class="t3"><code>#text</code>: <span data-x="">He dreamt.</span></li></ul></li></ul></li><li class="t1"><code>p</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t3"><code>#text</code>: <span data-x="">He dreamt that he ate breakfast.</span></li></ul></li></ul></li></ul></li><li class="t1"><code>p</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t3"><code>#text</code>: <span data-x="">Then lunch.</span></li></ul></li></ul></li></ul></li></ul></li><li class="t1"><code>p</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t1"><code>i</code><ul><li class="t3"><code>#text</code>: <span data-x="">And finally dinner.</span></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Errors involving fragile syntax constructs</dt>
+
+   <dd>
+
+    <p>There are syntax constructs that, for historical reasons, are relatively fragile. To help
+    reduce the number of users who accidentally run into such problems, they are made
+    non-conforming.</p>
+
+    <div class="example">
+
+     <p>For example, the parsing of certain named character references in attributes happens even
+     with the closing semicolon being omitted. It is safe to include an ampersand followed by
+     letters that do not form a named character reference, but if the letters are changed to a
+     string that <em>does</em> form a named character reference, they will be interpreted as that
+     character instead.</p>
+
+     <p>In this fragment, the attribute's value is "<code data-x="">?bill&amp;ted</code>":</p>
+
+     <pre class="bad">&lt;a href="?bill&amp;ted">Bill and Ted&lt;/a></pre>
+
+     <p>In the following fragment, however, the attribute's value is actually "<code
+     data-x="">?art&copy;</code>", <em>not</em> the intended "<code data-x="">?art&amp;copy</code>",
+     because even without the final semicolon, "<code data-x="">&amp;copy</code>" is handled the same
+     as "<code data-x="">&amp;copy;</code>" and thus gets interpreted as "<code
+     data-x="">&copy;</code>":</p>
+
+     <pre class="bad">&lt;a href="?art&amp;copy">Art and Copy&lt;/a></pre>
+
+     <p>To avoid this problem, all named character references are required to end with a semicolon,
+     and uses of named character references without a semicolon are flagged as errors.</p>
+
+     <p>Thus, the correct way to express the above cases is as
+     follows:</p>
+
+     <pre>&lt;a href="?bill&amp;ted">Bill and Ted&lt;/a> &lt;!-- &amp;ted is ok, since it's not a named character reference --></pre>
+     <pre>&lt;a href="?art&amp;amp;copy">Art and Copy&lt;/a> &lt;!-- the &amp; has to be escaped, since &amp;copy <em>is</em> a named character reference --></pre>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Errors involving known interoperability problems in legacy user agents</dt>
+
+   <dd>
+
+    <p>Certain syntax constructs are known to cause especially subtle or serious problems in legacy
+    user agents, and are therefore marked as non-conforming to help authors avoid them.</p>
+
+    <div class="example">
+
+     <p>For example, this is why the U+0060 GRAVE ACCENT character (`) is not allowed in unquoted
+     attributes. In certain legacy user agents, <!-- namely IE --> it is sometimes treated as a
+     quote character.</p>
+
+    </div>
+
+    <div class="example">
+
+     <p>Another example of this is the DOCTYPE, which is required to trigger <span>no-quirks
+     mode</span>, because the behavior of legacy user agents in <span>quirks mode</span> is often
+     largely undocumented.</p>
+
+    </div>
+
+   </dd>
+
+
+<!--ADD-TOPIC:Security-->
+   <dt>Errors that risk exposing authors to security attacks</dt>
+
+   <dd>
+
+    <p>Certain restrictions exist purely to avoid known security problems.</p>
+
+    <div class="example">
+
+     <p>For example, the restriction on using UTF-7 exists purely to avoid authors falling prey to a
+     known cross-site-scripting attack using UTF-7. <a href="#refsUTF7">[UTF7]</a></p>
+
+    </div>
+
+   </dd>
+<!--REMOVE-TOPIC:Security-->
+
+
+   <dt>Cases where the author's intent is unclear</dt>
+
+   <dd>
+
+    <p>Markup where the author's intent is very unclear is often made non-conforming. Correcting
+    these errors early makes later maintenance easier.</p>
+
+    <div class="example">
+
+     <p>For example, it is unclear whether the author intended the following to be an
+     <code>h1</code> heading or an <code>h2</code> heading:</p>
+
+     <pre class="bad">&lt;h1>Contact details&lt;/h2></pre>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Cases that are likely to be typos</dt>
+
+   <dd>
+
+    <p>When a user makes a simple typo, it is helpful if the error can be caught early, as this can
+    save the author a lot of debugging time. This specification therefore usually considers it an
+    error to use element names, attribute names, and so forth, that do not match the names defined
+    in this specification.</p>
+
+    <div class="example">
+
+     <p>For example, if the author typed <code>&lt;capton></code> instead of
+     <code>&lt;caption></code>, this would be flagged as an error and the author could correct the
+     typo immediately.</p>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Errors that could interfere with new syntax in the future</dt>
+
+   <dd>
+
+    <p>In order to allow the language syntax to be extended in the future, certain otherwise
+    harmless features are disallowed.</p>
+
+    <div class="example">
+
+     <p>For example, "attributes" in end tags are ignored currently, but they are invalid, in case a
+     future change to the language makes use of that syntax feature without conflicting with
+     already-deployed (and valid!) content.</p>
+
+    </div>
+
+   </dd>
+
+
+  </dl>
+
+  <p>Some authors find it helpful to be in the practice of always quoting all attributes and always
+  including all optional tags, preferring the consistency derived from such custom over the minor
+  benefits of terseness afforded by making use of the flexibility of the HTML syntax. To aid such
+  authors, conformance checkers can provide modes of operation wherein such conventions are
+  enforced.</p>
+
+
+
+  <h4>Restrictions on content models and on attribute values</h4>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>Beyond the syntax of the language, this specification also places restrictions on how elements
+  and attributes can be specified. These restrictions are present for similar reasons:</p>
+
+  <dl>
+
+
+   <dt>Errors involving content with dubious semantics</dt>
+
+   <dd>
+
+    <p>To avoid misuse of elements with defined meanings, content models are defined that restrict
+    how elements can be nested when such nestings would be of dubious value.</p>
+
+    <p class="example">For example, this specification disallows nesting a <code>section</code>
+    element inside a <code>kbd</code> element, since it is highly unlikely for an author to indicate
+    that an entire section should be keyed in.</p>
+
+   </dd>
+
+
+   <dt>Errors that involve a conflict in expressed semantics</dt>
+
+   <dd>
+
+    <p>Similarly, to draw the author's attention to mistakes in the use of elements, clear
+    contradictions in the semantics expressed are also considered conformance errors.</p>
+
+    <div class="example">
+
+     <p>In the fragments below, for example, the semantics are nonsensical: a separator cannot
+     simultaneously be a cell, nor can a radio button be a progress bar.</p>
+
+     <pre class="bad">&lt;hr role="cell"></pre>
+     <pre class="bad">&lt;input type=radio role=progressbar></pre>
+
+    </div>
+
+    <p class="example">Another example is the restrictions on the content models of the
+    <code>ul</code> element, which only allows <code>li</code> element children. Lists by definition
+    consist just of zero or more list items, so if a <code>ul</code> element contains something
+    other than an <code>li</code> element, it's not clear what was meant.</p>
+
+   </dd>
+
+
+   <dt>Cases where the default styles are likely to lead to confusion</dt>
+
+   <dd>
+
+    <p>Certain elements have default styles or behaviors that make certain combinations likely to
+    lead to confusion. Where these have equivalent alternatives without this problem, the confusing
+    combinations are disallowed.</p>
+
+    <p class="example">For example, <code>div</code> elements are rendered as block boxes, and
+    <code>span</code> elements as inline boxes. Putting a block box in an inline box is
+    unnecessarily confusing; since either nesting just <code>div</code> elements, or nesting just
+    <code>span</code> elements, or nesting <code>span</code> elements inside <code>div</code>
+    elements all serve the same purpose as nesting a <code>div</code> element in a <code>span</code>
+    element, but only the latter involves a block box in an inline box, the latter combination is
+    disallowed.</p>
+
+    <p class="example">Another example would be the way <span>interactive content</span> cannot be
+    nested. For example, a <code>button</code> element cannot contain a <code>textarea</code>
+    element. This is because the default behavior of such nesting interactive elements would be
+    highly confusing to users. Instead of nesting these elements, they can be placed side by
+    side.</p>
+
+   </dd>
+
+
+   <dt>Errors that indicate a likely misunderstanding of the specification</dt>
+
+   <dd>
+
+    <p>Sometimes, something is disallowed because allowing it would likely cause author
+    confusion.</p>
+
+    <p class="example">For example, setting the <code data-x="attr-fe-disabled">disabled</code>
+    attribute to the value "<code data-x="">false</code>" is disallowed, because despite the
+    appearance of meaning that the element is enabled, it in fact means that the element is
+    <em>disabled</em> (what matters for implementations is the presence of the attribute, not its
+    value).</p>
+
+   </dd>
+
+
+   <dt>Errors involving limits that have been imposed merely to simplify the language</dt>
+
+   <dd>
+
+    <p>Some conformance errors simplify the language that authors need to learn.</p>
+
+    <p class="example">For example, the <code>area</code> element's <code
+    data-x="attr-area-shape">shape</code> attribute, despite accepting both <code
+    data-x="attr-area-shape-keyword-circ">circ</code> and <code
+    data-x="attr-area-shape-keyword-circle">circle</code> values in practice as synonyms, disallows
+    the use of the <code data-x="attr-area-shape-keyword-circ">circ</code> value, so as to simplify
+    tutorials and other learning aids. There would be no benefit to allowing both, but it would
+    cause extra confusion when teaching the language.</p>
+
+   </dd>
+
+
+   <dt>Errors that involve peculiarities of the parser</dt>
+
+   <dd>
+
+    <p>Certain elements are parsed in somewhat eccentric ways (typically for historical reasons),
+    and their content model restrictions are intended to avoid exposing the author to these
+    issues.</p>
+
+    <div class="example">
+
+     <p>For example, a <code>form</code> element isn't allowed inside <span>phrasing content</span>,
+     because when parsed as HTML, a <code>form</code> element's start tag will imply a
+     <code>p</code> element's end tag. Thus, the following markup results in two <span
+     data-x="paragraph">paragraphs</span>, not one:</p>
+
+     <pre>&lt;p>Welcome. &lt;form>&lt;label>Name:&lt;/label> &lt;input>&lt;/form></pre>
+
+     <p>It is parsed exactly like the following:</p>
+
+     <pre>&lt;p>Welcome. &lt;/p>&lt;form>&lt;label>Name:&lt;/label> &lt;input>&lt;/form></pre>
+
+    </div>
+
+   </dd>
+
+
+   <dt>Errors that would likely result in scripts failing in hard-to-debug ways</dt>
+
+   <dd>
+
+    <p>Some errors are intended to help prevent script problems that would be hard to debug.</p>
+
+    <p class="example">This is why, for instance, it is non-conforming to have two <code
+    data-x="attr-id">id</code> attributes with the same value. Duplicate IDs lead to the wrong
+    element being selected, with sometimes disastrous effects whose cause is hard to determine.</p>
+
+   </dd>
+
+
+   <dt>Errors that waste authoring time</dt>
+
+   <dd>
+
+    <p>Some constructs are disallowed because historically they have been the cause of a lot of
+    wasted authoring time, and by encouraging authors to avoid making them, authors can save time in
+    future efforts.</p>
+
+    <p class="example">For example, a <code>script</code> element's <code
+    data-x="attr-script-src">src</code> attribute causes the element's contents to be ignored.
+    However, this isn't obvious, especially if the element's contents appear to be executable script
+    &mdash; which can lead to authors spending a lot of time trying to debug the inline script
+    without realizing that it is not executing. To reduce this problem, this specification makes it
+    non-conforming to have executable script in a <code>script</code> element when the <code
+    data-x="attr-script-src">src</code> attribute is present. This means that authors who are
+    validating their documents are less likely to waste time with this kind of mistake.</p>
+
+   </dd>
+
+
+   <dt>Errors that involve areas that affect authors migrating to and from XHTML</dt>
+
+   <dd>
+
+    <p>Some authors like to write files that can be interpreted as both XML and HTML with similar
+    results. Though this practice is discouraged in general due to the myriad of subtle
+    complications involved (especially when involving scripting, styling, or any kind of automated
+    serialisation), this specification has a few restrictions intended to at least somewhat mitigate
+    the difficulties. This makes it easier for authors to use this as a transitionary step when
+    migrating between HTML and XHTML.</p>
+
+    <p class="example">For example, there are somewhat complicated rules surrounding the <code
+    data-x="attr-lang">lang</code> and <code data-x="attr-xml-lang">xml:lang</code> attributes
+    intended to keep the two synchronized.</p>
+
+    <p class="example">Another example would be the restrictions on the values of <code
+    data-x="">xmlns</code> attributes in the HTML serialisation, which are intended to ensure that
+    elements in conforming documents end up in the same namespaces whether processed as HTML or
+    XML.</p>
+
+   </dd>
+
+
+   <dt>Errors that involve areas reserved for future expansion</dt>
+
+   <dd>
+
+    <p>As with the restrictions on the syntax intended to allow for new syntax in future revisions
+    of the language, some restrictions on the content models of elements and values of attributes
+    are intended to allow for future expansion of the HTML vocabulary.</p>
+
+    <p class="example">For example, limiting the values of the <code
+    data-x="attr-hyperlink-target">target</code> attribute that start with an U+005F LOW LINE
+    character (_) to only specific predefined values allows new predefined values to be introduced
+    at a future time without conflicting with author-defined values.</p>
+
+   </dd>
+
+
+   <dt>Errors that indicate a mis-use of other specifications</dt>
+
+   <dd>
+
+    <p>Certain restrictions are intended to support the restrictions made by other
+    specifications.</p>
+
+    <p class="example">For example, requiring that attributes that take media queries use only
+    <em>valid</em> media queries reinforces the importance of following the conformance rules of
+    that specification.</p>
+
+   </dd>
+
+  </dl>
+
+
+
+  <h3>Suggested reading</h3>
+
+  <!-- NON-NORMATIVE SECTION -->
+
+  <p>The following documents might be of interest to readers of this specification.</p>
+
+  <dl>
+
+   <dt><cite>Character Model for the World Wide Web 1.0: Fundamentals</cite> <a href="#refsCHARMOD">[CHARMOD]</a></dt>
+
+   <dd><blockquote><p>This Architectural Specification provides authors of specifications, software
+   developers, and content developers with a common reference for interoperable text manipulation on
+   the World Wide Web, building on the Universal Character Set, defined jointly by the Unicode
+   Standard and ISO/IEC 10646. Topics addressed include use of the terms 'character', 'encoding' and
+   'string', a reference processing model, choice and identification of character encodings,
+   character escaping, and string indexing.</p></blockquote></dd>
+
+   <dt><cite>Unicode Security Considerations</cite> <a href="#refsUTR36">[UTR36]</a></dt>
+
+   <dd><blockquote><p>Because Unicode contains such a large number of characters and incorporates
+   the varied writing systems of the world, incorrect usage can expose programs or systems to
+   possible security attacks. This is especially important as more and more products are
+   internationalized. This document describes some of the security considerations that programmers,
+   system analysts, standards developers, and users should take into account, and provides specific
+   recommendations to reduce the risk of problems.</p></blockquote></dd>
+
+   <dt><cite>Web Content Accessibility Guidelines (WCAG) 2.0</cite> <a href="#refsWCAG">[WCAG]</a></dt>
+
+   <dd><blockquote><p>Web Content Accessibility Guidelines (WCAG) 2.0 covers a wide range of
+   recommendations for making Web content more accessible. Following these guidelines will make
+   content accessible to a wider range of people with disabilities, including blindness and low
+   vision, deafness and hearing loss, learning disabilities, cognitive limitations, limited
+   movement, speech disabilities, photosensitivity and combinations of these. Following these
+   guidelines will also often make your Web content more usable to users in
+   general.</p></blockquote></dd>
+
+   <dt class="nodev"><cite>Authoring Tool Accessibility Guidelines (ATAG) 2.0</cite> <a href="#refsATAG">[ATAG]</a></dt>
+
+   <dd class="nodev"><blockquote><p>This specification provides guidelines for designing Web content
+   authoring tools that are more accessible for people with disabilities. An authoring tool that
+   conforms to these guidelines will promote accessibility by providing an accessible user interface
+   to authors with disabilities as well as by enabling, supporting, and promoting the production of
+   accessible Web content by all authors.</p></blockquote></dd>
+
+   <dt class="nodev"><cite>User Agent Accessibility Guidelines (UAAG) 2.0</cite> <a href="#refsUAAG">[UAAG]</a></dt>
+
+   <dd class="nodev"><blockquote><p>This document provides guidelines for designing user agents that
+   lower barriers to Web accessibility for people with disabilities. User agents include browsers
+   and other types of software that retrieve and render Web content. A user agent that conforms to
+   these guidelines will promote accessibility through its own user interface and through other
+   internal facilities, including its ability to communicate with other technologies (especially
+   assistive technologies). Furthermore, all users, not just users with disabilities, should find
+   conforming user agents to be more usable.</p></blockquote></dd>
+
+  </dl>
+
+
+
+  <h2 id="infrastructure">Common infrastructure</h2>
+
+  <h3>Terminology</h3>
+
+  <p>This specification refers to both HTML and XML attributes and IDL attributes, often in the same
+  context. When it is not clear which is being referred to, they are referred to as <dfn
+  data-x="">content attributes</dfn> for HTML and XML attributes, and <dfn data-x="">IDL
+  attributes</dfn> for those defined on IDL interfaces. Similarly, the term "properties" is used for
+  both JavaScript object properties and CSS properties. When these are ambiguous they are qualified
+  as <dfn data-x="">object properties</dfn> and <dfn data-x="">CSS properties</dfn> respectively.</p>
+
+  <p>Generally, when the specification states that a feature applies to <span>the HTML syntax</span>
+  or <span>the XHTML syntax</span>, it also includes the other. When a feature specifically only
+  applies to one of the two languages, it is called out by explicitly stating that it does not apply
+  to the other format, as in "for HTML, ... (this does not apply to XHTML)".</p>
+
+  <p>This specification uses the term <dfn data-x="">document</dfn> to refer to any use of HTML,
+  ranging from short static documents to long essays or reports with rich multimedia, as well as to
+  fully-fledged interactive applications. The term is used to refer both to <code>Document</code>
+  objects and their descendant DOM trees, and to serialised byte streams using the <span data-x="the
+  HTML syntax">HTML syntax</span> or <span data-x="the XHTML syntax">XHTML syntax</span>, depending
+  on context.</p>
+
+  <p>In the context of the DOM structures, the terms <span data-x="HTML documents">HTML
+  document</span> and <span data-x="XML documents">XML document</span> are used as defined in the DOM
+  specification, and refer specifically to two different modes that <code>Document</code> objects
+  can find themselves in. <a href="#refsDOM">[DOM]</a> (Such uses are always hyperlinked to their
+  definition.)</p>
+
+  <p>In the context of byte streams, the term HTML document refers to resources labeled as
+  <code>text/html</code>, and the term XML document refers to resources labeled with an <span>XML
+  MIME type</span>.</p>
+
+  <p>The term <dfn>XHTML document</dfn> is used to refer to both <code>Document</code>s in the <span
+  data-x="XML documents">XML document</span> mode that contains element nodes in the <span>HTML
+  namespace</span>, and byte streams labeled with an <span>XML MIME type</span> that contain
+  elements from the <span>HTML namespace</span>, depending on context.</p>
+
+  <hr>
+
+  <p>For simplicity, terms such as <dfn data-x="">shown</dfn>, <dfn data-x="">displayed</dfn>, and
+  <dfn data-x="">visible</dfn> might sometimes be used when referring to the way a document is
+  rendered to the user. These terms are not meant to imply a visual medium; they must be considered
+  to apply to other media in equivalent ways.</p>
+
+  <div class="nodev">
+
+  <p>When an algorithm B says to return to another algorithm A, it implies that A called B. Upon
+  returning to A, the implementation must continue from where it left off in calling B.</p>
+
+  </div>
+
+  <!-- should find somewhere more appropriate to put this -->
+  <p>The term "transparent black" refers to the colour with red, green, blue, and alpha channels all
+  set to zero.</p>
+
+
+  <h4>Resources</h4>
+
+  <p>The specification uses the term <dfn data-x="">supported</dfn> when referring to whether a user
+  agent has an implementation capable of decoding the semantics of an external resource. A format or
+  type is said to be <i>supported</i> if the implementation can process an external resource of that
+  format or type without critical aspects of the resource being ignored. Whether a specific resource
+  is <i>supported</i> can depend on what features of the resource's format are in use.</p>
+
+  <p class="example">For example, a PNG image would be considered to be in a supported format if its
+  pixel data could be decoded and rendered, even if, unbeknownst to the implementation, the image
+  also contained animation data.</p>
+
+  <p class="example">An MPEG-4 video file would not be considered to be in a supported format if the
+  compression format used was not supported, even if the implementation could determine the
+  dimensions of the movie from the file's metadata.</p>
+
+  <p>What some specifications, in particular the HTTP specification, refer to as a
+  <i>representation</i> is referred to in this specification as a <dfn data-x="">resource</dfn>. <a
+  href="#refsHTTP">[HTTP]</a></p>
+
+  <p>The term <dfn>MIME type</dfn> is used to refer to what is sometimes called an <i>Internet media
+  type</i> in protocol literature. The term <i>media type</i> in this specification is used to refer
+  to the type of media intended for presentation, as used by the CSS specifications. <a
+  href="#refsRFC2046">[RFC2046]</a> <a href="#refsMQ">[MQ]</a></p>
+
+  <p>A string is a <dfn>valid MIME type</dfn> if it matches the <code data-x="">media-type</code>
+  rule defined in section 3.7 "Media Types" of RFC 2616. In particular, a <span>valid MIME
+  type</span> may include MIME type parameters. <a href="#refsHTTP">[HTTP]</a></p>
+
+  <p>A string is a <dfn>valid MIME type with no parameters</dfn> if it matches the <code
+  data-x="">media-type</code> rule defined in section 3.7 "Media Types" of RFC 2616, but does not
+  contain any U+003B SEMICOLON characters (;). In other words, if it consists only of a type and
+  subtype, with no MIME Type parameters. <a href="#refsHTTP">[HTTP]</a></p>
+
+  <p>The term <dfn>HTML MIME type</dfn> is used to refer to the <span>MIME type</span>
+  <code>text/html</code>.</p>
+
+  <p>A resource's <dfn>critical subresources</dfn> are those that the resource needs to have
+  available to be correctly processed. Which resources are considered critical or not is defined by
+  the specification that defines the resource's format.</p>
+
+  <p>The term <dfn data-x="data protocol"><code data-x="">data:</code> URL</dfn> refers to <span
+  data-x="URL">URLs</span> that use the <code data-x="">data:</code> scheme. <a
+  href="#refsRFC2397">[RFC2397]</a></p>
+
+
+  <h4>XML</h4>
+
+  <p id="html-namespace">To ease migration from HTML to XHTML, UAs conforming to this specification
+  will place elements in HTML in the <code>http://www.w3.org/1999/xhtml</code> namespace, at least
+  for the purposes of the DOM and CSS. The term "<dfn>HTML elements</dfn>", when used in this
+  specification, refers to any element in that namespace, and thus refers to both HTML and XHTML
+  elements.</p>
+
+  <p>Except where otherwise stated, all elements defined or mentioned in this specification are in
+  the <span>HTML namespace</span> ("<code>http://www.w3.org/1999/xhtml</code>"), and all attributes
+  defined or mentioned in this specification have no namespace.</p>
+
+  <p>The term <dfn>element type</dfn> is used to refer to the set of elements that have a given
+  local name and namespace. For example, <code>button</code> elements are elements with the element
+  type <code>button</code>, meaning they have the local name "<code data-x="">button</code>" and
+  (implicitly as defined above) the <span>HTML namespace</span>.</p>
+
+  <p>Attribute names are said to be <dfn>XML-compatible</dfn> if they match the <a
+  href="http://www.w3.org/TR/xml/#NT-Name"><code data-x="">Name</code></a> production defined in XML
+  and they contain no U+003A COLON characters (:). <a href="#refsXML">[XML]</a></p>
+
+  <p>The term <dfn>XML MIME type</dfn> is used to refer to the <span data-x="MIME type">MIME
+  types</span> <code data-x="">text/xml</code>, <code data-x="">application/xml</code>, and any
+  <span>MIME type</span> whose subtype ends with the four characters "<code data-x="">+xml</code>".
+  <a href="#refsRFC3023">[RFC3023]</a></p>
+
+
+  <h4>DOM trees</h4>
+
+  <p>The <dfn>root element of a <code>Document</code> object</dfn> is that <code>Document</code>'s
+  first element child, if any. If it does not have one then the <code>Document</code> has no root
+  element.</p>
+
+  <p>The term <dfn>root element</dfn>, when not referring to a <code>Document</code> object's root
+  element, means the furthest ancestor element node of whatever node is being discussed, or the node
+  itself if it has no ancestors. When the node is a part of the document, then the node's <span>root
+  element</span> is indeed the document's root element; however, if the node is not currently part
+  of the document tree, the root element will be an orphaned node.</p>
+
+  <p>When an element's <span>root element</span> is the <span>root element of a
+  <code>Document</code> object</span>, it is said to be <dfn>in a <code>Document</code></dfn>. An
+  element is said to have been <dfn data-x="insert an element into a document">inserted into a
+  document</dfn> when its <span>root element</span> changes and is now the document's <span>root
+  element</span>. Analogously, an element is said to have been <dfn data-x="remove an element from a
+  document">removed from a document</dfn> when its <span>root element</span> changes from being the
+  document's <span>root element</span> to being another element.</p>
+
+  <p>A node's <dfn>home subtree</dfn> is the subtree rooted at that node's <span>root
+  element</span>. When a node is <span>in a <code>Document</code></span>, its <span>home
+  subtree</span> is that <code>Document</code>'s tree.</p>
+
+  <p>The <code>Document</code> of a <code>Node</code> (such as an element) is the
+  <code>Document</code> that the <code>Node</code>'s <code
+  data-x="dom-Node-ownerDocument">ownerDocument</code> IDL attribute returns. When a
+  <code>Node</code> is <span>in a <code>Document</code></span> then that <code>Document</code> is
+  always the <code>Node</code>'s <code>Document</code>, and the <code>Node</code>'s <code
+  data-x="dom-Node-ownerDocument">ownerDocument</code> IDL attribute thus always returns that
+  <code>Document</code>.</p>
+
+  <p>The <code>Document</code> of a content attribute is the <code>Document</code> of the
+  attribute's element.</p>
+
+  <p>The term <dfn>tree order</dfn> means a pre-order, depth-first traversal of DOM nodes involved
+  (through the <code data-x="dom-Node-parentNode">parentNode</code>/<code
+  data-x="dom-Node-childNodes">childNodes</code> relationship).</p>
+
+  <p>When it is stated that some element or attribute is <dfn data-x="ignore">ignored</dfn>, or
+  treated as some other value, or handled as if it was something else, this refers only to the
+  processing of the node after it is in the DOM. <span class="nodev">A user agent must not mutate the
+  DOM in such situations.</span></p>
+
+  <p>A content attribute is said to <dfn data-x="">change</dfn> value only if its new value is
+  different than its previous value; setting an attribute to a value it already has does not change
+  it.</p>
+
+  <p>The term <dfn data-x="">empty</dfn>, when used of an attribute value, <code>Text</code> node, or
+  string, means that the length of the text is zero (i.e. not even containing spaces or <span>control
+  characters</span>).</p>
+
+
+  <h4>Scripting</h4>
+
+  <p>The construction "a <code>Foo</code> object", where <code>Foo</code> is actually an interface,
+  is sometimes used instead of the more accurate "an object implementing the interface
+  <code>Foo</code>".</p>
+
+  <p>An IDL attribute is said to be <dfn data-x="">getting</dfn> when its value is being retrieved
+  (e.g. by author script), and is said to be <dfn data-x="">setting</dfn> when a new value is
+  assigned to it.</p>
+
+  <p>If a DOM object is said to be <dfn>live</dfn>, then the attributes and methods on that object
+  <span class="nodev">must</span> operate on the actual underlying data, not a snapshot of the
+  data.</p>
+
+  <p>In the contexts of events, the terms <i>fire</i> and <i>dispatch</i> are used as defined in the
+  DOM specification: <dfn data-x="concept-event-fire">firing</dfn> an event means to create and <span
+  data-x="concept-event-dispatch">dispatch</span> it, and <dfn
+  data-x="concept-event-dispatch">dispatching</dfn> an event means to follow the steps that propagate
+  the event through the tree. The term <dfn data-x="concept-events-trusted">trusted event</dfn> is
+  used to refer to events whose <code data-x="dom-event-isTrusted">isTrusted</code> attribute is
+  initialised to true. <a href="#refsDOM">[DOM]</a></p>
+
+
+  <h4>Plugins</h4>
+
+  <p>The term <dfn>plugin</dfn> refers to a user-agent defined set of content handlers used by the
+  user agent that can take part in the user agent's rendering of a <code>Document</code> object, but
+  that neither act as <span data-x="child browsing context">child browsing contexts</span> of the
+  <code>Document</code> nor introduce any <code>Node</code> objects to the <code>Document</code>'s
+  DOM.</p>
+
+  <p>Typically such content handlers are provided by third parties, though a user agent can also
+  designate built-in content handlers as plugins.</p>
+
+  <div class="nodev">
+
+  <p>A user agent must not consider the types <code>text/plain</code> and
+  <code>application/octet-stream</code> as having a registered <span>plugin</span>.</p> <!-- because
+  of the way <object> elements handles those types, if nothing else (it also doesn't make any sense
+  to have a plugin registered for those types, of course) -->
+
+  </div>
+
+  <p class="example">One example of a plugin would be a PDF viewer that is instantiated in a
+  <span>browsing context</span> when the user navigates to a PDF file. This would count as a plugin
+  regardless of whether the party that implemented the PDF viewer component was the same as that
+  which implemented the user agent itself. However, a PDF viewer application that launches separate
+  from the user agent (as opposed to using the same interface) is not a plugin by this
+  definition.</p>
+
+  <p class="note">This specification does not define a mechanism for interacting with plugins, as it
+  is expected to be user-agent- and platform-specific. Some UAs might opt to support a plugin
+  mechanism such as the Netscape Plugin API; others might use remote content converters or have
+  built-in support for certain types. Indeed, this specification doesn't require user agents to
+  support plugins at all. <a href="#refsNPAPI">[NPAPI]</a></p>
+
+  <p>A plugin can be <dfn data-x="concept-plugin-secure">secured</dfn> if it honors the semantics of
+  the <code data-x="attr-iframe-sandbox">sandbox</code> attribute.</p>
+
+  <p class="example">For example, a secured plugin would prevent its contents from creating pop-up
+  windows when the plugin is instantiated inside a sandboxed <code>iframe</code>.</p>
+
+  <div class="nodev">
+
+  <p class="warning">Browsers should take extreme care when interacting with external content
+  intended for <span data-x="plugin">plugins</span>. When third-party software is run with the same
+  privileges as the user agent itself, vulnerabilities in the third-party software become as
+  dangerous as those in the user agent.</p>
+
+  <p>Since different users having differents sets of <span data-x="plugin">plugins</span> provides a
+  fingerprinting vector that increases the chances of users being uniquely identified, user agents
+  are encouraged to support the exact same set of <span data-x="plugin">plugins</span> for each
+  user.
+  <!--INSERT FINGERPRINT-->
+  </p>
+
+  </div>
+
+
+
+  <h4 id="encoding-terminology">Character encodings</h4>
+
+  <p>A <dfn data-x="encoding">character encoding</dfn>, or just <i>encoding</i> where that is not
+  ambiguous, is a defined way to convert between byte streams and Unicode strings, as defined in the
+  WHATWG Encoding standard. An <span>encoding</span> has an <dfn>encoding name</dfn> and one or more
+  <dfn data-x="encoding label">encoding labels</dfn>, referred to as the encoding's <i>name</i> and
+  <i>labels</i> in the Encoding standard. <a href="#refsENCODING">[ENCODING]</a></p>
+
+  <p>An <dfn>ASCII-compatible character encoding</dfn> is a single-byte or variable-length
+  <span>encoding</span> in which the bytes 0x09, 0x0A, 0x0C, 0x0D, 0x20 - 0x22, 0x26, 0x27, 0x2C -
+  0x3F, 0x41 - 0x5A, and 0x61 - 0x7A<!-- is that list ok? do any character sets we want to support
+  do things outside that range? -->, ignoring bytes that are the second and later bytes of multibyte
+  sequences, all correspond to single-byte sequences that map to the same Unicode characters as
+  those bytes in Windows-1252<!--ANSI_X3.4-1968 (US-ASCII)-->. <a href="#refsENCODING">[ENCODING]</a></p>
+
+  <p class="note">This includes such encodings as Shift_JIS, HZ-GB-2312, and variants of ISO-2022,
+  even though it is possible in these encodings for bytes like 0x70 to be part of longer sequences
+  that are unrelated to their interpretation as ASCII. It excludes UTF-16 variants, as well as
+  obsolete legacy encodings such as UTF-7, GSM03.38, and EBCDIC variants.</p>
+
+  <!--
+   We'll have to change that if anyone comes up with a way to have a document that is valid as two
+   different encodings at once, with different <meta charset> elements applying in each case.
+  -->
+
+  <p>The term <dfn>a UTF-16 encoding</dfn> refers to any variant of UTF-16: UTF-16LE or UTF-16BE,
+  regardless of the presence or absence of a BOM. <a href="#refsENCODING">[ENCODING]</a></p>
+
+  <p>The term <dfn>code unit</dfn> is used as defined in the Web IDL specification: a 16 bit
+  unsigned integer, the smallest atomic component of a <code>DOMString</code>. (This is a narrower
+  definition than the one used in Unicode, and is not the same as a <i>code point</i>.) <a
+  href="#refsWEBIDL">[WEBIDL]</a></p>
+
+  <p>The term <dfn>Unicode code point</dfn> means a <i data-x="">Unicode scalar value</i> where
+  possible, and an isolated surrogate code point when not. When a conformance requirement is defined
+  in terms of characters or Unicode code points, a pair of <span data-x="code unit">code units</span>
+  consisting of a high surrogate followed by a low surrogate must be treated as the single code
+  point represented by the surrogate pair, but isolated surrogates must each be treated as the
+  single code point with the value of the surrogate. <a href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p>In this specification, the term <dfn>character</dfn>, when not qualified as <em>Unicode</em>
+  character, is synonymous with the term <span>Unicode code point</span>.</p>
+
+  <p>The term <dfn>Unicode character</dfn> is used to mean a <i data-x="">Unicode scalar value</i>
+  (i.e. any Unicode code point that is not a surrogate code point). <a
+  href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p>The <dfn>code-unit length</dfn> of a string is the number of <span data-x="code unit">code
+  units</span> in that string.</p>
+
+  <p class="note">This complexity results from the historical decision to define the DOM API in
+  terms of 16 bit (UTF-16) <span data-x="code unit">code units</span>, rather than in terms of <span
+  data-x="Unicode character">Unicode characters</span>.</p>
+
+
+
+  <div class="nodev">
+
+  <h3>Conformance requirements</h3>
+
+  <p>All diagrams, examples, and notes in this specification are non-normative, as are all sections
+  explicitly marked non-normative. Everything else in this specification is normative.</p>
+
+  <p>The key words "MUST", "MUST NOT", <!--"REQUIRED",--> <!--"SHALL", "SHALL NOT",--> "SHOULD", "SHOULD
+  NOT", <!--"RECOMMENDED", "NOT RECOMMENDED",--> "MAY", and "OPTIONAL" in the normative parts of
+  this document are to be interpreted as described in RFC2119. The key word "OPTIONALLY" in the
+  normative parts of this document is to be interpreted with the same normative meaning as "MAY" and
+  "OPTIONAL". For readability, these words do not appear in all uppercase letters in this
+  specification. <a href="#refsRFC2119">[RFC2119]</a></p>
+
+  <p>Requirements phrased in the imperative as part of algorithms (such as "strip any leading space
+  characters" or "return false and abort these steps") are to be interpreted with the meaning of the
+  key word ("must", "should", "may", etc) used in introducing the algorithm.</p>
+
+  <div class="example">
+
+   <p>For example, were the spec to say:</p>
+
+   <pre>To eat an orange, the user must:
+1. Peel the orange.
+2. Separate each slice of the orange.
+3. Eat the orange slices.</pre>
+
+   <p>...it would be equivalent to the following:</p>
+
+   <pre>To eat an orange:
+1. The user must peel the orange.
+2. The user must separate each slice of the orange.
+3. The user must eat the orange slices.</pre>
+
+   <p>Here the key word is "must".</p>
+
+   <p>The former (imperative) style is generally preferred in this specification for stylistic
+   reasons.</p>
+
+  </div>
+
+  <p>Conformance requirements phrased as algorithms or specific steps may be implemented in any
+  manner, so long as the end result is equivalent. (In particular, the algorithms defined in this
+  specification are intended to be easy to follow, and not intended to be performant.)</p>
+
+  </div>
+
+
+
+  <div class="nodev">
+
+  <h4>Conformance classes</h4>
+
+  <p>This specification describes the conformance criteria for <span class="nodev">user agents
+  (relevant to implementors) and</span> documents<span class="nodev"> (relevant to authors and
+  authoring tool implementors)</span>.</p>
+
+  <p><dfn>Conforming documents</dfn> are those that comply with all the conformance criteria for
+  documents. For readability, some of these conformance requirements are phrased as conformance
+  requirements on authors; such requirements are implicitly requirements on documents: by
+  definition, all documents are assumed to have had an author. (In some cases, that author may
+  itself be a user agent &mdash; such user agents are subject to additional rules, as explained
+  below.)</p>
+
+  <p class="example">For example, if a requirement states that "authors must not use the <code
+  data-x="">foobar</code> element", it would imply that documents are not allowed to contain elements
+  named <code data-x="">foobar</code>.</p>
+
+  <p class="note impl">There is no implied relationship between document conformance requirements
+  and implementation conformance requirements. User agents are not free to handle non-conformant
+  documents as they please; the processing model described in this specification applies to
+  implementations regardless of the conformity of the input documents.</p>
+
+  <p>User agents fall into several (overlapping) categories with different conformance
+  requirements.</p>
+
+  <dl>
+
+   <dt id="interactive">Web browsers and other interactive user agents</dt>
+
+   <dd>
+
+    <p>Web browsers that support <span>the XHTML syntax</span> must process elements and attributes
+    from the <span>HTML namespace</span> found in XML documents as described in this specification,
+    so that users can interact with them, unless the semantics of those elements have been
+    overridden by other specifications.</p>
+
+    <p class="example">A conforming XHTML processor would, upon finding an XHTML <code>script</code>
+    element in an XML document, execute the script contained in that element. However, if the
+    element is found within a transformation expressed in XSLT (assuming the user agent also
+    supports XSLT), then the processor would instead treat the <code>script</code> element as an
+    opaque element that forms part of the transform.</p>
+
+    <p>Web browsers that support <span>the HTML syntax</span> must process documents labeled with an
+    <span>HTML MIME type</span> as described in this specification, so that users can interact with
+    them.</p>
+
+    <p>User agents that support scripting must also be conforming implementations of the IDL
+    fragments in this specification, as described in the Web IDL specification. <a
+    href="#refsWEBIDL">[WEBIDL]</a></p>
+
+    <p class="note">Unless explicitly stated, specifications that override the semantics of HTML
+    elements do not override the requirements on DOM objects representing those elements. For
+    example, the <code>script</code> element in the example above would still implement the
+    <code>HTMLScriptElement</code> interface.</p>
+
+   </dd>
+
+   <dt id="non-interactive">Non-interactive presentation user agents</dt>
+
+   <dd>
+
+    <p>User agents that process HTML and XHTML documents purely to render non-interactive versions
+    of them must comply to the same conformance criteria as Web browsers, except that they are
+    exempt from requirements regarding user interaction.</p>
+
+    <p class="note">Typical examples of non-interactive presentation user agents are printers
+    (static UAs) and overhead displays (dynamic UAs). It is expected that most static
+    non-interactive presentation user agents will also opt to <a href="#non-scripted">lack scripting
+    support</a>.</p>
+
+    <p class="example">A non-interactive but dynamic presentation UA would still execute scripts,
+    allowing forms to be dynamically submitted, and so forth. However, since the concept of "focus"
+    is irrelevant when the user cannot interact with the document, the UA would not need to support
+    any of the focus-related DOM APIs.</p>
+
+   </dd>
+
+   <dt id="renderingUA">Visual user agents that support the suggested default rendering</dt>
+
+   <dd>
+
+    <p>User agents, whether interactive or not, may be designated (possibly as a user option) as
+    supporting the suggested default rendering defined by this specification.</p>
+
+    <p>This is not required. In particular, even user agents that do implement the suggested default
+    rendering are encouraged to offer settings that override this default to improve the experience
+    for the user, e.g. changing the colour contrast, using different focus styles, or otherwise
+    making the experience more accessible and usable to the user.</p>
+
+    <p>User agents that are designated as supporting the suggested default rendering must, while so
+    designated, implement the rules in <a href="#rendering">the rendering section</a> that that
+    section defines as the behavior that user agents are <em>expected</em> to implement.</p>
+
+   </dd>
+
+   <dt id="non-scripted">User agents with no scripting support</dt>
+
+   <dd>
+
+    <p>Implementations that do not support scripting (or which have their scripting features
+    disabled entirely) are exempt from supporting the events and DOM interfaces mentioned in this
+    specification. For the parts of this specification that are defined in terms of an events model
+    or in terms of the DOM, such user agents must still act as if events and the DOM were
+    supported.</p>
+
+    <p class="note">Scripting can form an integral part of an application. Web browsers that do not
+    support scripting, or that have scripting disabled, might be unable to fully convey the author's
+    intent.</p>
+
+   </dd>
+
+
+   <dt>Conformance checkers</dt>
+
+   <dd id="conformance-checkers">
+
+    <p>Conformance checkers must verify that a document conforms to the applicable conformance
+    criteria described in this specification. Automated conformance checkers are exempt from
+    detecting errors that require interpretation of the author's intent (for example, while a
+    document is non-conforming if the content of a <code>blockquote</code> element is not a quote,
+    conformance checkers running without the input of human judgement do not have to check that
+    <code>blockquote</code> elements only contain quoted material).</p>
+
+    <p>Conformance checkers must check that the input document conforms when parsed without a
+    <span>browsing context</span> (meaning that no scripts are run, and that the parser's
+    <span>scripting flag</span> is disabled), and should also check that the input document conforms
+    when parsed with a <span>browsing context</span> in which scripts execute, and that the scripts
+    never cause non-conforming states to occur other than transiently during script execution
+    itself. (This is only a "SHOULD" and not a "MUST" requirement because it has been proven to be
+    impossible. <a href="#refsCOMPUTABLE">[COMPUTABLE]</a>)</p>
+
+    <p>The term "HTML validator" can be used to refer to a conformance checker that itself conforms
+    to the applicable requirements of this specification.</p>
+
+    <div class="note">
+
+     <p>XML DTDs cannot express all the conformance requirements of this specification. Therefore, a
+     validating XML processor and a DTD cannot constitute a conformance checker. Also, since neither
+     of the two authoring formats defined in this specification are applications of SGML, a
+     validating SGML system cannot constitute a conformance checker either.</p>
+
+     <p>To put it another way, there are three types of conformance criteria:</p>
+
+     <ol>
+
+      <li>Criteria that can be expressed in a DTD.</li>
+
+      <li>Criteria that cannot be expressed by a DTD, but can still be checked by a machine.</li>
+
+      <li>Criteria that can only be checked by a human.</li>
+
+     </ol>
+
+     <p>A conformance checker must check for the first two. A simple DTD-based validator only checks
+     for the first class of errors and is therefore not a conforming conformance checker according
+     to this specification.</p>
+
+    </div>
+   </dd>
+
+
+   <dt>Data mining tools</dt>
+
+   <dd id="data-mining">
+
+    <p>Applications and tools that process HTML and XHTML documents for reasons other than to either
+    render the documents or check them for conformance should act in accordance with the semantics
+    of the documents that they process.</p>
+
+    <p class="example">A tool that generates <span data-x="outline">document outlines</span> but
+    increases the nesting level for each paragraph and does not increase the nesting level for each
+    section would not be conforming.</p>
+
+   </dd>
+
+
+   <dt id="editors">Authoring tools and markup generators</dt>
+
+   <dd>
+
+    <p>Authoring tools and markup generators must generate <span>conforming documents</span>.
+    Conformance criteria that apply to authors also apply to authoring tools, where appropriate.</p>
+
+    <p>Authoring tools are exempt from the strict requirements of using elements only for their
+    specified purpose, but only to the extent that authoring tools are not yet able to determine
+    author intent. However, authoring tools must not automatically misuse elements or encourage
+    their users to do so.</p>
+
+    <p class="example">For example, it is not conforming to use an <code>address</code> element for
+    arbitrary contact information; that element can only be used for marking up contact information
+    for the author of the document or section. However, since an authoring tool is likely unable to
+    determine the difference, an authoring tool is exempt from that requirement. This does not mean,
+    though, that authoring tools can use <code>address</code> elements for any block of italics text
+    (for instance); it just means that the authoring tool doesn't have to verify that when the user
+    uses a tool for inserting contact information for a section, that the user really is doing that
+    and not inserting something else instead.</p>
+
+    <p class="note">In terms of conformance checking, an editor has to output documents that conform
+    to the same extent that a conformance checker will verify.</p>
+
+    <p>When an authoring tool is used to edit a non-conforming document, it may preserve the
+    conformance errors in sections of the document that were not edited during the editing session
+    (i.e. an editing tool is allowed to round-trip erroneous content). However, an authoring tool
+    must not claim that the output is conformant if errors have been so preserved.</p>
+
+    <p>Authoring tools are expected to come in two broad varieties: tools that work from structure
+    or semantic data, and tools that work on a What-You-See-Is-What-You-Get media-specific editing
+    basis (WYSIWYG).</p>
+
+    <p>The former is the preferred mechanism for tools that author HTML, since the structure in the
+    source information can be used to make informed choices regarding which HTML elements and
+    attributes are most appropriate.</p>
+
+    <p>However, WYSIWYG tools are legitimate. WYSIWYG tools should use elements they know are
+    appropriate, and should not use elements that they do not know to be appropriate. This might in
+    certain extreme cases mean limiting the use of flow elements to just a few elements, like
+    <code>div</code>, <code>b</code>, <code>i</code>, and <code>span</code> and making liberal use
+    of the <code data-x="attr-style">style</code> attribute.</p>
+
+    <p>All authoring tools, whether WYSIWYG or not, should make a best effort attempt at enabling
+    users to create well-structured, semantically rich, media-independent content.</p>
+
+   </dd>
+
+  </dl>
+
+  <p id="hardwareLimitations">User agents may impose implementation-specific limits on otherwise
+  unconstrained inputs, e.g. to prevent denial of service attacks, to guard against running out of
+  memory, or to work around platform-specific limitations.
+  <!--INSERT FINGERPRINT-->
+  </p>
+
+  <p>For compatibility with existing content and prior specifications, this specification describes
+  two authoring formats: one based on XML (referred to as <span>the XHTML syntax</span>), and one
+  using a <a href="#writing">custom format</a> inspired by SGML (referred to as <span>the HTML
+  syntax</span>). Implementations must support at least one of these two formats, although
+  supporting both is encouraged.</p>
+
+  <p>Some conformance requirements are phrased as requirements on elements, attributes, methods or
+  objects. Such requirements fall into two categories: those describing content model restrictions,
+  and those describing implementation behavior. Those in the former category are requirements on
+  documents and authoring tools. Those in the second category are requirements on user agents.
+  Similarly, some conformance requirements are phrased as requirements on authors; such requirements
+  are to be interpreted as conformance requirements on the documents that authors produce. (In other
+  words, this specification does not distinguish between conformance criteria on authors and
+  conformance criteria on documents.)</p>
+
+  </div>
+
+
+  <div class="nodev">
+
+  <h4>Dependencies</h4>
+
+  <p>This specification relies on several other underlying specifications.</p>
+
+  <dl>
+
+   <dt>Unicode and Encoding</dt>
+
+   <dd>
+
+    <p>The Unicode character set is used to represent textual data, and the WHATWG Encoding standard
+    defines requirements around <span data-x="encoding">character encodings</span>. <a
+    href="#refsUNICODE">[UNICODE]</a></p>
+
+    <p class="note">This specification <a href="#encoding-terminology">introduces terminology</a>
+    based on the terms defined in those specifications, as described earlier.</p>
+
+    <p>The following terms are used as defined in the WHATWG Encoding standard: <a
+    href="#refsENCODING">[ENCODING]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn>Getting an encoding</dfn>
+
+     <li>The <dfn>encoder</dfn> and <dfn>decoder</dfn> algorithms for various encodings, including
+     the <dfn>UTF-8 encoder</dfn> and <dfn>UTF-8 decoder</dfn>
+
+     <li>The generic <dfn>decode</dfn> algorithm which takes a byte stream and an encoding and
+     returns a character stream
+
+     <li>The <dfn>UTF-8 decode</dfn> algorithm which takes a byte stream and returns a character
+     stream, additionally stripping one leading UTF-8 Byte Order Mark (BOM), if any
+
+    </ul>
+
+    <p class="note">The <span>UTF-8 decoder</span> is distinct from the <i>UTF-8 decode
+    algorithm</i>. The latter first strips a Byte Order Mark (BOM), if any, and then invokes the
+    former.</p>
+
+    <p>For readability, character encodings are sometimes referenced in this specification with a
+    case that differs from the canonical case given in the WHATWG Encoding standard. (For example,
+    "UTF-16LE" instead of "utf-16le".)</p>
+
+   </dd>
+
+
+   <dt>XML</dt>
+
+   <dd>
+
+    <p>Implementations that support <span>the XHTML syntax</span> must support some version of XML,
+    as well as its corresponding namespaces specification, because that syntax uses an XML
+    serialisation with namespaces. <a href="#refsXML">[XML]</a> <a href="#refsXMLNS">[XMLNS]</a></p>
+
+   </dd>
+
+
+   <dt>URLs</dt>
+
+   <dd>
+
+    <p>The following terms are defined in the WHATWG URL standard: <a href="#refsURL">[URL]</a></p>
+
+    <ul class="brief">
+     <li><dfn>URL</dfn>
+     <li><dfn>Absolute URL</dfn>
+     <li><dfn>Relative URL</dfn>
+     <li><dfn data-x="concept-url-scheme-relative">Relative schemes</dfn>
+     <li>The <dfn>URL parser</dfn>
+     <li><dfn>Parsed URL</dfn>
+     <li>The <dfn data-x="concept-url-scheme">scheme</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-scheme-data">scheme data</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-username">username</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-password">password</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-host">host</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-port">port</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-path">path</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-query">query</dfn> component of a <span>parsed URL</span>
+     <li>The <dfn data-x="concept-url-fragment">fragment</dfn> component of a <span>parsed URL</span>
+     <li><dfn data-x="concept-url-parse-error">Parse errors</dfn> from the <span>URL parser</span>
+     <li>The <dfn data-x="concept-url-serializer">URL serializer</dfn>
+     <li><dfn>Default encode set</dfn>
+     <li><dfn>Percent encode</dfn>
+     <li><dfn>UTF-8 percent encode</dfn>
+     <li><dfn>Percent decode</dfn>
+     <li><dfn>Decoder error</dfn>
+     <li>The <dfn>domain label to ASCII</dfn> algorithm</li>
+     <li>The <dfn>domain label to Unicode</dfn> algorithm</li>
+     <li><dfn><code>URLUtils</code></dfn> interface
+     <li><dfn><code>URLUtilsReadOnly</code></dfn> interface
+     <li><dfn data-x="dom-url-href"><code>href</code> attribute</dfn>
+     <li><dfn data-x="dom-url-protocol"><code>protocol</code> attribute</dfn>
+     <li>The <dfn data-x="concept-uu-get-the-base">get the base</dfn> hook for <code>URLUtils</code>
+     <li>The <dfn data-x="concept-uu-update">update steps</dfn> hook for <code>URLUtils</code>
+     <li>The <dfn data-x="concept-uu-set-the-input">set the input</dfn> algorithm for <code>URLUtils</code>
+     <li>The <dfn data-x="concept-uu-query-encoding">query encoding</dfn> of an <code>URLUtils</code> object
+     <li>The <dfn data-x="concept-uu-input">input</dfn> of an <code>URLUtils</code> object
+     <li>The <dfn data-x="concept-uu-url">url</dfn> of an <code>URLUtils</code> object
+    </ul>
+
+   </dd>
+
+
+   <dt>Cookies</dt>
+
+   <dd>
+
+    <p>The following terms are defined in the Cookie specification: <a
+    href="#refsCOOKIES">[COOKIES]</a></p>
+
+    <ul class="brief">
+     <li><dfn>cookie-string</dfn>
+     <li><dfn>receives a set-cookie-string</dfn>
+    </ul>
+
+   </dd>
+
+
+   <dt>Fetch</dt>
+
+   <dd>
+
+    <p>The following terms are defined in the WHATWG Fetch specification: <a href="#refsFETCH">[FETCH]</a></p>
+
+    <ul class="brief">
+     <li><dfn>cross-origin request</dfn>
+     <li><dfn>cross-origin request status</dfn>
+     <li><dfn>custom request headers</dfn>
+     <li><dfn>simple cross-origin request</dfn>
+     <li><dfn>redirect steps</dfn>
+     <li><dfn>omit credentials flag</dfn>
+     <li><dfn>resource sharing check</dfn>
+    </ul>
+
+    <p class="note">This specification does not yet use the "fetch" algorithm from the WHATWG Fetch
+    specification. It will be updated to do so in due course.</p>
+
+   </dd>
+
+
+<!--TOPIC:DOM APIs-->
+
+   <dt>Web IDL</dt>
+
+   <dd>
+
+    <p>The IDL fragments in this specification must be interpreted as required for conforming IDL
+    fragments, as described in the Web IDL specification. <a href="#refsWEBIDL">[WEBIDL]</a></p>
+
+    <p>The terms <dfn>supported property indices</dfn>, <dfn>determine the value of an indexed
+    property</dfn>, <dfn>support named properties</dfn>, <dfn>supported property names</dfn>,
+    <dfn>unenumerable</dfn>, <dfn>determine the value of a named property</dfn>, <dfn>platform array
+    objects</dfn>, and <dfn data-x="dfn-read-only-array">read only</dfn> (when applied to arrays)
+    are used as defined in the Web IDL specification. The algorithm to <dfn>convert a DOMString to a
+    sequence of Unicode characters</dfn> is similarly that defined in the Web IDL specification.</p>
+
+    <p>When this specification requires a user agent to <dfn>create a <code>Date</code> object</dfn>
+    representing a particular time (which could be the special value Not-a-Number), the milliseconds
+    component of that time, if any, must be truncated to an integer, and the time value of the newly
+    created <code>Date</code> object must represent the resulting truncated time.</p>
+
+    <p class="example">For instance, given the time 23045 millionths of a second after 01:00 UTC on
+    January 1st 2000, i.e. the time 2000-01-01T00:00:00.023045Z, then the <code>Date</code> object
+    created representing that time would represent the same time as that created representing the
+    time 2000-01-01T00:00:00.023Z, 45 millionths earlier. If the given time is NaN, then the result
+    is a <code>Date</code> object that represents a time value NaN (indicating that the object does
+    not represent a specific instant of time).</p>
+
+   </dd>
+
+
+   <dt>JavaScript</dt>
+
+   <dd>
+
+    <p>Some parts of the language described by this specification only support JavaScript as the
+    underlying scripting language. <a href="#refsECMA262">[ECMA262]</a></p>
+
+    <p class="note">The term "JavaScript" is used to refer to ECMA262, rather than the official term
+    ECMAScript, since the term JavaScript is more widely known. Similarly, the <span>MIME
+    type</span> used to refer to JavaScript in this specification is <code
+    data-x="">text/javascript</code>, since that is the most commonly used type, <span data-x="willful
+    violation">despite it being an officially obsoleted type</span> according to RFC 4329. <a
+    href="#refsRFC4329">[RFC4329]</a></p>
+
+    <p>The term <dfn>JavaScript global environment</dfn> refers to the <i data-x="">global
+    environment</i> concept defined in the ECMAScript specification.</p>
+
+    <p>The ECMAScript <dfn data-x="js-SyntaxError"><code>SyntaxError</code></dfn> exception is also
+    defined in the ECMAScript specification. <a href="#refsECMA262">[ECMA262]</a></p>
+
+    <p>The <dfn>ArrayBuffer</dfn> and related object types and underlying concepts from the
+    ECMAScript Specification are used for several features in this specification. <a
+    href="#refsECMA262">[ECMA262]</a></p>
+
+    <p>The following helper IDL is used for referring to <code>ArrayBuffer</code>-related types:</p>
+
+    <pre class="idl">typedef (<dfn>Int8Array</dfn> or <dfn>Uint8Array</dfn> or <dfn>Uint8ClampedArray</dfn> or
+         <dfn>Int16Array</dfn> or <dfn>Uint16Array</dfn> or
+         <dfn>Int32Array</dfn> or <dfn>Uint32Array</dfn> or
+         <dfn>Float32Array</dfn> or <dfn>Float64Array</dfn> or
+         <dfn>DataView</dfn>) <dfn>ArrayBufferView</dfn>;</pre>
+
+    <p class="note">In particular, the <code>Uint8ClampedArray</code> type is used by some <span
+    data-x="ImageData">2D canvas APIs</span>, and the <a href="#network"><code>WebSocket</code>
+    API</a> uses <code>ArrayBuffer</code> objects for handling binary frames.</p>
+
+   </dd>
+
+
+   <dt>DOM</dt>
+
+   <dd>
+
+    <p>The Document Object Model (DOM) is a representation &mdash; a model &mdash; of a document and
+    its content. The DOM is not just an API; the conformance criteria of HTML implementations are
+    defined, in this specification, in terms of operations on the DOM. <a
+    href="#refsDOM">[DOM]</a></p>
+
+    <p>Implementations must support DOM and the events defined in DOM Events, because this
+    specification is defined in terms of the DOM, and some of the features are defined as extensions
+    to the DOM interfaces. <a href="#refsDOM">[DOM]</a> <a href="#refsDOMEVENTS">[DOMEVENTS]</a></p>
+
+    <p>In particular, the following features are defined in the DOM specification: <a
+    href="#refsDOM">[DOM]</a></p> <!-- aka DOM Core or DOMCORE -->
+
+    <ul class="brief">
+
+     <li><dfn><code>Attr</code></dfn> interface</li>
+     <li><dfn><code>Comment</code></dfn> interface</li>
+     <li><dfn><code>DOMImplementation</code></dfn> interface</li>
+     <li><dfn data-x="DOM Document"><code>Document</code></dfn> interface</li>
+     <li><dfn><code>XMLDocument</code></dfn> interface</li>
+     <li><dfn><code>DocumentFragment</code></dfn> interface</li>
+     <li><dfn><code>DocumentType</code></dfn> interface</li>
+     <li><dfn><code>DOMException</code></dfn> interface</li>
+     <li><dfn><code>ChildNode</code></dfn> interface</li>
+     <li><dfn><code>Element</code></dfn> interface</li>
+     <li><dfn><code>Node</code></dfn> interface</li>
+     <li><dfn><code>NodeList</code></dfn> interface</li>
+     <li><dfn><code>ProcessingInstruction</code></dfn> interface</li>
+     <li><dfn><code>Text</code></dfn> interface</li>
+
+     <li><dfn><code>HTMLCollection</code></dfn> interface</li>
+     <li><dfn data-x="dom-HTMLCollection-item"><code>item()</code></dfn> method</li>
+     <li>The terms <dfn>collections</dfn> and <dfn>represented by the collection</dfn></li>
+
+     <li><dfn><code>DOMTokenList</code></dfn> interface</li>
+     <li><dfn><code>DOMSettableTokenList</code></dfn> interface</li>
+
+     <li><dfn data-x="dom-DOMImplementation-createDocument"><code>createDocument()</code></dfn> method</li>
+     <li><dfn data-x="dom-DOMImplementation-createHTMLDocument"><code>createHTMLDocument()</code></dfn> method</li>
+     <li><dfn data-x="dom-Document-createElement"><code>createElement()</code></dfn> method</li>
+     <li><dfn data-x="dom-Document-createElementNS"><code>createElementNS()</code></dfn> method</li>
+     <li><dfn data-x="dom-Document-getElementById"><code>getElementById()</code></dfn> method</li>
+     <li><dfn data-x="dom-Node-insertBefore"><code>insertBefore()</code></dfn> method</li>
+
+     <li><dfn data-x="dom-Node-ownerDocument"><code>ownerDocument</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Node-childNodes"><code>childNodes</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Node-localName"><code>localName</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Node-parentNode"><code>parentNode</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Node-namespaceURI"><code>namespaceURI</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Element-tagName"><code>tagName</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Element-id"><code>id</code></dfn> attribute</li>
+     <li><dfn><code>textContent</code></dfn> attribute</li>
+
+     <li>The <dfn data-x="concept-node-insert">insert</dfn>, <dfn data-x="concept-node-append">append</dfn>, <dfn data-x="concept-node-remove">remove</dfn>, <dfn data-x="concept-node-replace">replace</dfn>, and <dfn data-x="concept-node-adopt">adopt</dfn> algorithms for nodes</li>
+     <li>The <dfn>nodes are inserted</dfn> and <dfn>nodes are removed</dfn> concepts</li>
+     <li>An element's <dfn data-x="concept-node-adopt-ext">adopting steps</dfn></li>
+     <li>The <dfn>attribute list</dfn> concept.</li>
+     <li>The <dfn data-x="concept-cd-data">data</dfn> of a text node.</li>
+
+     <li><dfn><code>Event</code></dfn> interface</li>
+     <li><dfn><code>EventTarget</code></dfn> interface</li>
+     <li><dfn><code>EventInit</code></dfn> dictionary type</li>
+     <li><dfn data-x="dom-Event-target"><code>target</code></dfn> attribute</li>
+     <li><dfn data-x="dom-Event-isTrusted"><code>isTrusted</code></dfn> attribute</li>
+     <li>The <dfn data-x="concept-event-type">type</dfn> of an event</li>
+     <li>The concept of an <dfn data-x=concept-event-listener>event listener</dfn> and the <span data-x=concept-event-listener>event listeners</span> associated with an <code>EventTarget</code></li>
+     <li>The concept of a <dfn>target override</dfn></li>
+     <li>The concept of a regular <dfn>event parent</dfn> and a <dfn>cross-boundary event parent</dfn></li> <!-- see bug 18780 -->
+
+     <li>The <dfn data-x="document's character encoding">encoding</dfn> (herein the <i>character encoding</i>) and <dfn data-x="concept-document-content-type">content type</dfn> of a <code>Document</code></li>
+     <li>The distinction between <dfn>XML documents</dfn> and <dfn>HTML documents</dfn></li>
+     <li>The terms <dfn>quirks mode</dfn>, <dfn>limited-quirks mode</dfn>, and <dfn>no-quirks mode</dfn></li>
+     <li>The algorithm to <dfn data-x="concept-node-clone">clone</dfn> a <code>Node</code>, and the concept of <dfn data-x="concept-node-clone-ext">cloning steps</dfn> used by that algorithm</li>
+     <li>The concept of <dfn>base URL change steps</dfn> and the definition of what happens when an element is <dfn>affected by a base URL change</dfn></li>
+     <li>The concept of an element's <dfn data-x="concept-id">unique identifier (ID)</dfn></li>
+
+     <li>The concept of a DOM <dfn data-x="concept-range">range</dfn>, and the terms <dfn data-x="concept-range-start">start</dfn>, <dfn data-x="concept-range-end">end</dfn>, and <dfn data-x="concept-range-bp">boundary point</dfn> as applied to ranges.</li>
+
+     <li><dfn><code>MutationObserver</code></dfn> interface</li>
+     <li>The <dfn data-x="concept-mo-invoke">invoke <code>MutationObserver</code> objects</dfn> algorithm</li>
+
+     <li><dfn>Promise</dfn> interface</li>
+     <li>The <dfn data-x="concept-resolver">resolver</dfn> concept</li>
+     <li>The <dfn data-x="concept-resolver-fulfill">fulfill</dfn> and <dfn data-x="concept-resolver-reject">reject</dfn> algorithms</li>
+
+    </ul>
+
+    <p>The term <dfn>throw</dfn> in this specification is used as defined in the DOM specification.
+    The following <code>DOMException</code> types are defined in the DOM specification: <a
+    href="#refsDOM">[DOM]</a></p>
+
+    <ol class="brief">
+     <li value="1"><dfn><code>IndexSizeError</code></dfn></li>
+     <li value="3"><dfn><code>HierarchyRequestError</code></dfn></li>
+     <li value="4"><dfn><code>WrongDocumentError</code></dfn></li>
+     <li value="5"><dfn><code>InvalidCharacterError</code></dfn></li>
+     <li value="7"><dfn><code>NoModificationAllowedError</code></dfn></li>
+     <li value="8"><dfn><code>NotFoundError</code></dfn></li>
+     <li value="9"><dfn><code>NotSupportedError</code></dfn></li>
+     <li value="11"><dfn><code>InvalidStateError</code></dfn></li>
+     <li value="12"><dfn><code>SyntaxError</code></dfn></li>
+     <li value="13"><dfn><code>InvalidModificationError</code></dfn></li>
+     <li value="14"><dfn><code>NamespaceError</code></dfn></li>
+     <li value="15"><dfn><code>InvalidAccessError</code></dfn></li>
+     <li value="18"><dfn><code>SecurityError</code></dfn></li>
+     <li value="19"><dfn><code>NetworkError</code></dfn></li>
+     <li value="20"><dfn><code>AbortError</code></dfn></li>
+     <li value="21"><dfn><code>URLMismatchError</code></dfn></li>
+     <li value="22"><dfn><code>QuotaExceededError</code></dfn></li>
+     <li value="23"><dfn><code>TimeoutError</code></dfn></li>
+     <li value="24"><dfn><code>InvalidNodeTypeError</code></dfn></li>
+     <li value="25"><dfn><code>DataCloneError</code></dfn></li>
+    </ol>
+
+    <p class="example">For example, to <i>throw a <code>TimeoutError</code> exception</i>, a user
+    agent would construct a <code>DOMException</code> object whose type was the string "<code
+    data-x="">TimeoutError</code>" (and whose code was the number 23, for legacy reasons) and
+    actually throw that object as an exception.</p>
+
+    <p>The following features are defined in the DOM Events specification: <a
+    href="#refsDOMEVENTS">[DOMEVENTS]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn><code>MouseEvent</code></dfn> interface</li>
+     <li><dfn><code>MouseEventInit</code></dfn> dictionary type</li>
+
+     <li>The <dfn><code>FocusEvent</code></dfn> interface and its <dfn data-x="dom-FocusEvent-relatedTarget"><code>relatedTarget</code></dfn> attribute</li>
+
+     <li>The <dfn><code>UIEvent</code></dfn> interface's <dfn data-x="dom-UIEvent-detail"><code>detail</code></dfn> attribute</li>
+
+     <li><dfn data-x="event-click"><code>click</code></dfn> event</li>
+     <li><dfn data-x="event-dblclick"><code>dblclick</code></dfn> event</li>
+     <li><dfn data-x="event-mousedown"><code>mousedown</code></dfn> event</li>
+     <li><dfn data-x="event-mouseenter"><code>mouseenter</code></dfn> event</li>
+     <li><dfn data-x="event-mouseleave"><code>mouseleave</code></dfn> event</li>
+     <li><dfn data-x="event-mousemove"><code>mousemove</code></dfn> event</li>
+     <li><dfn data-x="event-mouseout"><code>mouseout</code></dfn> event</li>
+     <li><dfn data-x="event-mouseover"><code>mouseover</code></dfn> event</li>
+     <li><dfn data-x="event-mouseup"><code>mouseup</code></dfn> event</li>
+     <li><dfn data-x="event-mousewheel"><code>mousewheel</code></dfn> event</li>
+
+     <li><dfn data-x="event-keydown"><code>keydown</code></dfn> event</li>
+     <li><dfn data-x="event-keyup"><code>keyup</code></dfn> event</li>
+     <li><dfn data-x="event-keypress"><code>keypress</code></dfn> event</li>
+
+    </ul>
+
+    <p>The following features are defined in the Touch Events specification: <a
+    href="#refsTOUCH">[TOUCH]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn><code>Touch</code></dfn> interface</li>
+
+     <li><dfn>Touch point</dfn> concept</li>
+
+    </ul>
+
+    <p>This specification sometimes uses the term <dfn data-x="">name</dfn> to refer to the event's
+    <code data-x="dom-event-type">type</code>; as in, "an event named <code data-x="">click</code>"
+    or "if the event name is <code data-x="">keypress</code>". The terms "name" and "type" for
+    events are synonymous.</p>
+
+    <p>The following features are defined in the DOM Parsing and Serialisation specification: <a
+    href="#refsDOMPARSING">[DOMPARSING]</a></p>
+
+    <ul class="brief">
+     <li><dfn data-x="dom-innerHTML"><code>innerHTML</code></dfn></li>
+     <li><dfn data-x="dom-outerHTML"><code>outerHTML</code></dfn></li>
+    </ul>
+
+    <p class="note">User agents are also encouraged to implement the features described in the
+    <cite>HTML Editing APIs</cite> and <cite><code>UndoManager</code> and DOM Transaction</cite>
+    specifications.
+    <a href="#refsEDITING">[EDITING]</a>
+    <a href="#refsUNDO">[UNDO]</a>
+    </p>
+
+    <p>The following parts of the Fullscreen specification are referenced from this specification,
+    in part to define the rendering of <code>dialog</code> elements, and also to define how the
+    Fullscreen API interacts with the sandboxing features in HTML: <a
+    href="#refsFULLSCREEN">[FULLSCREEN]</a></p>
+
+    <ul class="brief">
+     <li>The <dfn>top layer</dfn> concept</li>
+     <li><dfn data-x="dom-element-requestFullscreen"><code>requestFullscreen()</code></dfn>
+     <li>The <dfn>fullscreen enabled flag</dfn></li>
+     <li>The <dfn>fully exit fullscreen</dfn> algorithm</li>
+    </ul>
+
+   </dd>
+
+
+
+   <dt>File API</dt>
+
+   <dd>
+
+    <p>This specification uses the following features defined in the File API specification: <a
+    href="#refsFILEAPI">[FILEAPI]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn><code>Blob</code></dfn></li>
+     <li><dfn><code>File</code></dfn></li>
+     <li><dfn><code>FileList</code></dfn></li>
+     <li><dfn data-x="dom-Blob-close"><code>Blob.close()</code></dfn></li>
+     <li><dfn data-x="dom-Blob-type"><code>Blob.type</code></dfn></li>
+     <li>The concept of <dfn data-x="file-error-read">read errors</dfn></li>
+    </ul>
+
+   </dd>
+
+
+   <dt>XMLHttpRequest</dt>
+
+   <dd>
+
+    <p>This specification references the XMLHttpRequest specification to describe how the two
+    specifications interact and to use its <code>ProgressEvent</code> features. The following
+    features and terms are defined in the XMLHttpRequest specification: <a
+    href="#refsXHR">[XHR]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn><code>XMLHttpRequest</code></dfn>
+     <li><dfn><code>ProgressEvent</code></dfn>
+     <li><dfn data-x="fire a progress event">Fire a progress event named <var data-x="">e</var></dfn>
+
+    </ul>
+
+   </dd>
+
+
+<!--TOPIC:HTML-->
+
+   <dt>Media Queries</dt>
+
+   <dd>
+
+    <p>Implementations must support the Media Queries language. <a href="#refsMQ">[MQ]</a></p>
+
+   </dd>
+
+
+   <dt>CSS modules</dt>
+
+   <dd>
+
+    <p>While support for CSS as a whole is not required of implementations of this specification
+    (though it is encouraged, at least for Web browsers), some features are defined in terms of
+    specific CSS requirements.</p>
+
+    <p>In particular, some features require that a string be <dfn>parsed as a CSS &lt;color&gt;
+    value</dfn>. When parsing a CSS value, user agents are required by the CSS specifications to
+    apply some error handling rules. These apply to this specification also. <a
+    href="#refsCSSCOLOR">[CSSCOLOR]</a> <a href="#refsCSS">[CSS]</a></p>
+
+    <p class="example">For example, user agents are required to close all open constructs upon
+    finding the end of a style sheet unexpectedly. Thus, when parsing the string "<code
+    data-x="">rgb(0,0,0</code>" (with a missing close-parenthesis) for a colour value, the close
+    parenthesis is implied by this error handling rule, and a value is obtained (the colour 'black').
+    However, the similar construct "<code data-x="">rgb(0,0,</code>" (with both a missing parenthesis
+    and a missing "blue" value) cannot be parsed, as closing the open construct does not result in a
+    viable value.</p>
+
+    <p>The term <dfn>CSS element reference identifier</dfn> is used as defined in the <cite>CSS
+    Image Values and Replaced Content</cite> specification to define the API that declares
+    identifiers for use with the CSS 'element()' function. <a
+    href="#refsCSSIMAGES">[CSSIMAGES]</a></p>
+
+    <p>Similarly, the term <dfn>provides a paint source</dfn> is used as defined in the <cite>CSS
+    Image Values and Replaced Content</cite> specification to define the interaction of certain HTML
+    elements with the CSS 'element()' function. <a href="#refsCSSIMAGES">[CSSIMAGES]</a></p>
+
+    <p>The term <dfn>default object size</dfn> is also defined in the <cite>CSS Image Values and
+    Replaced Content</cite> specification. <a href="#refsCSSIMAGES">[CSSIMAGES]</a></p>
+
+    <p>Implementations that support scripting must support the CSS Object Model. The following
+    features and terms are defined in the CSSOM specifications: <a href="#refsCSSOM">[CSSOM]</a> <a
+    href="#refsCSSOMVIEW">[CSSOMVIEW]</a>
+
+    <ul class="brief">
+     <li><dfn><code>Screen</code></dfn></li>
+     <li><dfn><code>LinkStyle</code></dfn></li>
+     <li><dfn><code>CSSStyleDeclaration</code></dfn></li>
+     <li><dfn data-x="dom-CSSStyleDeclaration-cssText"><code>cssText</code></dfn> attribute of <code>CSSStyleDeclaration</code></li>
+     <li><dfn><code>StyleSheet</code></dfn></li>
+     <li>The terms <dfn>create a CSS style sheet</dfn>, <dfn>remove a CSS style sheet</dfn>, and <dfn>associated CSS style sheet</dfn></li>
+     <li><dfn data-x="CSS style sheet">CSS style sheets</dfn> and their properties:
+         <dfn data-x="concept-css-style-sheet-type">type</dfn>,
+         <dfn data-x="concept-css-style-sheet-location">location</dfn>,
+         <dfn data-x="concept-css-style-sheet-parent-CSS-style-sheet">parent CSS style sheet</dfn>,
+         <dfn data-x="concept-css-style-sheet-owner-node">owner node</dfn>,
+         <dfn data-x="concept-css-style-sheet-owner-CSS-rule">owner CSS rule</dfn>,
+         <dfn data-x="concept-css-style-sheet-media">media</dfn>,
+         <dfn data-x="concept-css-style-sheet-title">title</dfn>,
+         <dfn data-x="concept-css-style-sheet-alternate-flag">alternate flag</dfn>,
+         <dfn data-x="concept-css-style-sheet-disabeld-flag">disabled flag</dfn>,
+         <dfn data-x="concept-css-style-sheet-CSS-rules">CSS rules</dfn>,
+         <dfn data-x="concept-css-style-sheet-origin-clean-flag">origin-clean flag</dfn>
+     </li>
+     <li><dfn>Alternative style sheet sets</dfn> and the <dfn>preferred style sheet set</dfn></li>
+     <li><dfn>Serializing a CSS value</dfn></li>
+     <li><dfn>Scroll an element into view</dfn></li>
+     <li><dfn>Scroll to the beginning of the document</dfn></li>
+     <li>The <dfn data-x="event-resize"><code>resize</code></dfn> event</li>
+     <li>The <dfn data-x="event-scroll"><code>scroll</code></dfn> event</li>
+    </ul>
+
+    <p>The term <dfn>environment encoding</dfn> is defined in the <cite>CSS Syntax</cite>
+    specifications. <a href="#refsCSSSYNTAX">[CSSSYNTAX]</a></p>
+
+    <p>The term <dfn>CSS styling attribute</dfn> is defined in the <cite>CSS Style Attributes</cite>
+    specification. <a href="#refsCSSATTR">[CSSATTR]</a></p>
+
+    <p>The <code>CanvasRenderingContext2D</code> object's use of fonts depends on the features
+    described in the CSS <cite>Fonts</cite> and <cite>Font Load Events</cite> specifications, including in particular
+    <dfn><code>FontLoader</code></dfn>. <a href="#refsCSSFONTS">[CSSFONTS]</a> <a
+    href="#refsCSSFONTLOAD">[CSSFONTLOAD]</a></p>
+
+   </dd>
+
+
+<!--TOPIC:Canvas-->
+
+   <dt>SVG</dt>
+
+   <dd>
+
+    <p>The following interface is defined in the SVG specification: <a href="#refsSVG">[SVG]</a></p>
+
+    <ul class="brief">
+     <li><dfn><code>SVGMatrix</code></dfn>
+    </ul>
+
+    <!-- mention that the parser supports it? -->
+
+   </dd>
+
+
+   <dt>WebGL</dt>
+
+   <dd>
+
+    <p>The following interface is defined in the WebGL specification: <a
+    href="#refsWEBGL">[WEBGL]</a></p>
+
+    <ul class="brief">
+     <li><dfn><code>WebGLRenderingContext</code></dfn>
+    </ul>
+
+   </dd>
+
+
+<!--TOPIC:HTML-->
+
+   <!-- mention that the parser supports mathml? -->
+
+
+<!--TOPIC:Video Text Tracks-->
+
+   <dt>WebVTT</dt>
+
+   <dd>
+
+    <p>Implementations may support <dfn>WebVTT</dfn> as a text track format for subtitles, captions,
+    chapter titles, metadata, etc, for media resources. <a href="#refsWEBVTT">[WEBVTT]</a></p>
+
+    <p>The following terms, used in this specification, are defined in the WebVTT specification:</p>
+
+    <ul class="brief">
+     <li><dfn>WebVTT file</dfn>
+     <li><dfn>WebVTT file using cue text</dfn>
+     <li><dfn>WebVTT file using chapter title text</dfn>
+     <li><dfn>WebVTT file using only nested cues</dfn>
+     <li><dfn>WebVTT parser</dfn>
+     <li>The <dfn>rules for updating the display of WebVTT text tracks</dfn>
+     <li>The <dfn>rules for interpreting WebVTT cue text</dfn>
+     <li>The WebVTT <dfn>text track cue writing direction</dfn>
+    </ul>
+
+   </dd>
+
+
+<!--TOPIC:WebSocket API-->
+
+   <dt>The WebSocket protocol</dt>
+
+   <dd>
+
+    <p>The following terms are defined in the WebSocket protocol specification: <a
+    href="#refsWSP">[WSP]</a></p>
+
+    <ul class="brief">
+
+     <li><dfn>establish a WebSocket connection</dfn>
+     <li><dfn>the WebSocket connection is established</dfn>
+     <li><dfn>validate the server's response</dfn>
+     <li><dfn>extensions in use</dfn>
+     <li><dfn>subprotocol in use</dfn>
+     <li><dfn>headers to send appropriate cookies</dfn>
+     <li><dfn>cookies set during the server's opening handshake</dfn>
+     <li><dfn>a WebSocket message has been received</dfn>
+     <li><dfn>send a WebSocket Message</dfn>
+     <li><dfn>fail the WebSocket connection</dfn>
+     <li><dfn>close the WebSocket connection</dfn>
+     <li><dfn>start the WebSocket closing handshake</dfn>
+     <li><dfn>the WebSocket closing handshake is started</dfn>
+     <li><dfn>the WebSocket connection is closed</dfn> (possibly <i data-x="">cleanly</i>)
+     <li><dfn>the WebSocket connection close code</dfn>
+     <li><dfn>the WebSocket connection close reason</dfn>
+
+    </ul>
+
+   </dd>
+
+
+<!--TOPIC:HTML-->
+
+   <dt>ARIA</dt>
+
+   <dd>
+
+    <p>The terms <dfn>strong native semantics</dfn> is used as defined in the ARIA specification.
+    The term <dfn>default implicit ARIA semantics</dfn> has the same meaning as the term <i>implicit
+    WAI-ARIA semantics</i> as used in the ARIA specification. <a href="#refsARIA">[ARIA]</a></p>
+
+    <p>The <dfn data-x="attr-aria-role"><code>role</code></dfn> and <code data-x="">aria-*</code>
+    attributes are defined in the ARIA specification. <a href="#refsARIA">[ARIA]</a></p>
+
+
+   </dd>
+
+
+  </dl>
+
+  <p>This specification does not <em>require</em> support of any particular network protocol, style
+  sheet language, scripting language, or any of the DOM specifications beyond those required in the
+  list above. However, the language described by this specification is biased towards CSS as the
+  styling language, JavaScript as the scripting language, and HTTP as the network protocol, and
+  several features assume that those languages and protocols are in use.</p>
+
+  <p>A user agent that implements the HTTP protocol must implement the Web Origin Concept
+  specification and the HTTP State Management Mechanism specification (Cookies) as well. <a
+  href="#refsHTTP">[HTTP]</a> <a href="#refsORIGIN">[ORIGIN]</a> <a
+  href="#refsCOOKIES">[COOKIES]</a></p>
+
+  <p class="note">This specification might have certain additional requirements on character
+  encodings, image formats, audio formats, and video formats in the respective sections.</p>
+
+  </div>
+
+  </div>
+
+
+  <h4>Extensibility</h4>
+
+  <p>Vendor-specific proprietary user agent extensions to this specification are strongly
+  discouraged. Documents must not use such extensions, as doing so reduces interoperability and
+  fragments the user base, allowing only users of specific user agents to access the content in
+  question.</p>
+
+  <div class="nodev">
+
+  <p>If such extensions are nonetheless needed, e.g. for experimental purposes, then vendors are
+  strongly urged to use one of the following extension mechanisms:</p>
+
+  <ul>
+
+   <li><p>For markup-level features that can be limited to the XML serialisation and need not be
+   supported in the HTML serialisation, vendors should use the namespace mechanism to define custom
+   namespaces in which the non-standard elements and attributes are supported.</p>
+
+   <li>
+
+    <p>For markup-level features that are intended for use with <span>the HTML syntax</span>,
+    extensions should be limited to new attributes of the form "<code data-x="">x-<var
+    data-x="">vendor</var>-<var data-x="">feature</var></code>", where <var data-x="">vendor</var> is a
+    short string that identifies the vendor responsible for the extension, and <var
+    data-x="">feature</var> is the name of the feature. New element names should not be created.
+    Using attributes for such extensions exclusively allows extensions from multiple vendors to
+    co-exist on the same element, which would not be possible with elements. Using the "<code
+    data-x="">x-<var data-x="">vendor</var>-<var data-x="">feature</var></code>" form allows extensions
+    to be made without risk of conflicting with future additions to the specification.</p>
+
+    <div class="example">
+
+     <p>For instance, a browser named "FerretBrowser" could use "ferret" as a vendor prefix, while a
+     browser named "Mellblom Browser" could use "mb". If both of these browsers invented extensions
+     that turned elements into scratch-and-sniff areas, an author experimenting with these features
+     could write:</p>
+
+     <pre>&lt;p>This smells of lemons!
+&lt;span x-ferret-smellovision x-ferret-smellcode="LEM01"
+      x-mb-outputsmell x-mb-smell="lemon juice">&lt;/span>&lt;/p></pre>
+
+    </div>
+
+   </li>
+
+  </ul>
+
+  <p>Attribute names beginning with the two characters "<code data-x="">x-</code>" are reserved for
+  user agent use and are guaranteed to never be formally added to the HTML language. For
+  flexibility, attributes names containing underscores (the U+005F LOW LINE character) are also
+  reserved for experimental purposes and are guaranteed to never be formally added to the HTML
+  language.</p>
+
+  <p class="note">Pages that use such attributes are by definition non-conforming.</p>
+
+  <p>For DOM extensions, e.g. new methods and IDL attributes, the new members should be prefixed by
+  vendor-specific strings to prevent clashes with future versions of this specification.</p>
+
+  <p>For events, experimental event types should be prefixed with vendor-specific strings.</p>
+
+  <div class="example">
+
+   <p>For example, if a user agent called "Pleas<!--e h-->old" were to add an event to indicate when
+   the user is going up in an elevator, it could use the prefix "<code data-x="">pleasold</code>" and
+   thus name the event "<code data-x="">pleasoldgoingup</code>", possibly with an event handler
+   attribute named "<code data-x="">onpleasoldgoingup</code>".</p>
+
+  </div>
+
+  <p>All extensions must be defined so that the use of extensions neither contradicts nor causes the
+  non-conformance of functionality defined in the specification.</p> <!-- thanks to QA Framework -->
+
+  <div class="example">
+
+   <p>For example, while strongly discouraged from doing so, an implementation "Foo Browser" could
+   add a new IDL attribute "<code data-x="">fooTypeTime</code>" to a control's DOM interface that
+   returned the time it took the user to select the current value of a control (say). On the other
+   hand, defining a new control that appears in a form's <code
+   data-x="dom-form-elements">elements</code> array would be in violation of the above requirement,
+   as it would violate the definition of <code data-x="dom-form-elements">elements</code> given in
+   this specification.</p>
+
+  </div>
+
+  <p>When adding new <span data-x="reflect">reflecting</span> IDL attributes corresponding to content
+  attributes of the form "<code data-x="">x-<var data-x="">vendor</var>-<var
+  data-x="">feature</var></code>", the IDL attribute should be named "<code data-x=""><var
+  data-x="">vendor</var><var data-x="">Feature</var></code>" (i.e. the "<code data-x="">x</code>" is
+  dropped from the IDL attribute's name).</p>
+
+  </div>
+
+  <hr>
+
+  <p>When vendor-neutral extensions to this specification are needed, either this specification can
+  be updated accordingly, or an extension specification can be written that overrides the
+  requirements in this specification. When someone applying this specification to their activities
+  decides that they will recognise the requirements of such an extension specification, it becomes
+  an <dfn data-x="other applicable specifications">applicable specification</dfn> for the purposes of
+  conformance requirements in this specification.</p>
+
+  <p class="note">Someone could write a specification that defines any arbitrary byte stream as
+  conforming, and then claim that their random junk is conforming. However, that does not mean that
+  their random junk actually is conforming for everyone's purposes: if someone else decides that
+  that specification does not apply to their work, then they can quite legitimately say that the
+  aforementioned random junk is just that, junk, and not conforming at all. As far as conformance
+  goes, what matters in a particular community is what that community <em>agrees</em> is
+  applicable.</p>
+
+  <div class="nodev">
+
+  <hr>
+
+  <p>User agents must treat elements and attributes that they do not understand as semantically
+  neutral; leaving them in the DOM (for DOM processors), and styling them according to CSS (for CSS
+  processors), but not inferring any meaning from them.</p>
+
+<!--ADD-TOPIC:Security-->
+  <p>When support for a feature is disabled (e.g. as an emergency measure to mitigate a security
+  problem, or to aid in development, or for performance reasons), user agents must act as if they
+  had no support for the feature whatsoever, and as if the feature was not mentioned in this
+  specification. For example, if a particular feature is accessed via an attribute in a Web IDL
+  interface, the attribute itself would be omitted from the objects that implement that interface
+  &mdash; leaving the attribute on the object but making it return null or throw an exception is
+  insufficient.</p>
+<!--REMOVE-TOPIC:Security-->
+
+  </div>
+
+
+  <div class="nodev">
+
+  <h4>Interactions with XPath and XSLT</h4>
+
+  <p id="xpath-1.0-processors">Implementations of XPath 1.0 that operate on <span>HTML
+  documents</span> parsed or created in the manners described in this specification (e.g. as part of
+  the <code data-x="">document.evaluate()</code> API) must act as if the following edit was applied
+  to the XPath 1.0 specification.</p>
+
+  <p>First, remove this paragraph:</p>
+
+  <blockquote cite="http://www.w3.org/TR/1999/REC-xpath-19991116#node-tests">
+
+   <p>A <a href="http://www.w3.org/TR/REC-xml-names#NT-QName">QName</a> in the node test is expanded
+   into an <a href="http://www.w3.org/TR/1999/REC-xpath-19991116#dt-expanded-name">expanded-name</a>
+   using the namespace declarations from the expression context. This is the same way expansion is
+   done for element type names in start and end-tags except that the default namespace declared with
+   <code data-x="">xmlns</code> is not used: if the <a
+   href="http://www.w3.org/TR/REC-xml-names#NT-QName">QName</a> does not have a prefix, then the
+   namespace URI is null (this is the same way attribute names are expanded). It is an error if the
+   <a href="http://www.w3.org/TR/REC-xml-names#NT-QName">QName</a> has a prefix for which there is
+   no namespace declaration in the expression context.</p>
+
+  </blockquote>
+
+  <p>Then, insert in its place the following:</p>
+
+  <blockquote cite="http://www.w3.org/Bugs/Public/show_bug.cgi?id=7059#c37">
+
+   <p>A QName in the node test is expanded into an expanded-name using the namespace declarations
+   from the expression context. If the QName has a prefix, then there must be a<!-- added 2009-10-27
+   - http://www.w3.org/Bugs/Public/show_bug.cgi?id=8062 --> namespace declaration for this prefix in
+   the expression context, and the corresponding<!-- typo fixed 2009-10-27 -
+   http://www.w3.org/Bugs/Public/show_bug.cgi?id=8063 --> namespace URI is the one that is
+   associated with this prefix. It is an error if the QName has a prefix for which there is no
+   namespace declaration in the expression context. </p>
+
+   <p>If the QName has no prefix and the principal node type of the axis is element, then the
+   default element namespace is used. Otherwise if the QName has no prefix, the namespace URI is
+   null. The default element namespace is a member of the context for the XPath expression. The
+   value of the default element namespace when executing an XPath expression through the DOM3 XPath
+   API is determined in the following way:</p>
+
+   <ol>
+
+    <li>If the context node is from an HTML DOM, the default element namespace is
+    "http://www.w3.org/1999/xhtml".</li>
+
+    <li>Otherwise, the default element namespace URI is null.</li>
+
+   </ol>
+
+   <p class="note">This is equivalent to adding the default element namespace feature of XPath 2.0
+   to XPath 1.0, and using the HTML namespace as the default element namespace for HTML documents.
+   It is motivated by the desire to have implementations be compatible with legacy HTML content
+   while still supporting the changes that this specification introduces to HTML regarding the
+   namespace used for HTML elements, and by the desire to use XPath 1.0 rather than XPath 2.0.</p>
+
+  </blockquote>
+
+  <p class="note">This change is a <span>willful violation</span> of the XPath 1.0 specification,
+  motivated by desire to have implementations be compatible with legacy content while still
+  supporting the changes that this specification introduces to HTML regarding which namespace is
+  used for HTML elements. <a href="#refsXPATH10">[XPATH10]</a></p> <!-- note: version matters for
+  this ref -->
+
+  <hr>
+
+  <p id="dom-based-xslt-1.0-processors">XSLT 1.0 processors outputting to a DOM when the output
+  method is "html" (either explicitly or via the defaulting rule in XSLT 1.0) are affected as
+  follows:</p>
+
+  <p>If the transformation program outputs an element in no namespace, the processor must, prior to
+  constructing the corresponding DOM element node, change the namespace of the element to the
+  <span>HTML namespace</span>, <span data-x="converted to ASCII lowercase">ASCII-lowercase</span> the
+  element's local name, and <span data-x="converted to ASCII lowercase">ASCII-lowercase</span> the
+  names of any non-namespaced attributes on the element.</p>
+
+  <p class="note">This requirement is a <span>willful violation</span> of the XSLT 1.0
+  specification, required because this specification changes the namespaces and case-sensitivity
+  rules of HTML in a manner that would otherwise be incompatible with DOM-based XSLT
+  transformations. (Processors that serialise the output are unaffected.) <a
+  href="#refsXSLT10">[XSLT10]</a></p> <!-- note: version matters for this ref -->
+
+  <hr>
+
+  <p>This specification does not specify precisely how XSLT processing interacts with the <span>HTML
+  parser</span> infrastructure (for example, whether an XSLT processor acts as if it puts any
+  elements into a <span>stack of open elements</span>). However, XSLT processors must <span>stop
+  parsing</span> if they successfully complete, and must set the <span>current document
+  readiness</span> first to "<code data-x="">interactive</code>"<!-- this synchronously fires an
+  event --> and then to "<code data-x="">complete</code>"<!-- this also synchronously fires an event
+  --> if they are aborted.</p>
+
+  <hr>
+
+  <p>This specification does not specify how XSLT interacts with the <span
+  data-x="navigate">navigation</span> algorithm, how it fits in with the <span>event loop</span>, nor
+  how error pages are to be handled (e.g. whether XSLT errors are to replace an incremental XSLT
+  output, or are rendered inline, etc).</p>
+
+  <p class="note">There are also additional non-normative comments regarding the interaction of XSLT
+  and HTML <a href="#scriptTagXSLT">in the <code>script</code> element section</a>, and of
+  XSLT, XPath, and HTML <a href="#template-XSLT-XPath">in the <code>template</code> element
+  section</a>.</p>
+
+  </div>
+
+
+
+
+  <h3>Case-sensitivity and string comparison</h3>
+
+  <p>Comparing two strings in a <dfn>case-sensitive</dfn> manner means comparing them exactly, code
+  point for code point.</p>
+
+  <p>Comparing two strings in an <dfn>ASCII case-insensitive</dfn> manner means comparing them
+  exactly, code point for code point, except that the characters in the range U+0041 to U+005A (i.e.
+  LATIN CAPITAL LETTER A to LATIN CAPITAL LETTER Z) and the corresponding characters in the range
+  U+0061 to U+007A (i.e. LATIN SMALL LETTER A to LATIN SMALL LETTER Z) are considered to also
+  match.</p>
+
+  <p>Comparing two strings in a <dfn>compatibility caseless</dfn> manner means using the Unicode
+  <i>compatibility caseless match</i> operation to compare the two strings, with no language-specific tailoirings. <a
+  href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p>Except where otherwise stated, string comparisons must be performed in a
+  <span>case-sensitive</span> manner.</p>
+
+
+  <div class="nodev">
+
+  <p><dfn data-x="converted to ASCII uppercase">Converting a string to ASCII uppercase</dfn> means
+  replacing all characters in the range U+0061 to U+007A (i.e. LATIN SMALL LETTER A to LATIN SMALL
+  LETTER Z) with the corresponding characters in the range U+0041 to U+005A (i.e. LATIN CAPITAL
+  LETTER A to LATIN CAPITAL LETTER Z).</p>
+
+  <p><dfn data-x="converted to ASCII lowercase">Converting a string to ASCII lowercase</dfn> means
+  replacing all characters in the range U+0041 to U+005A (i.e. LATIN CAPITAL LETTER A to LATIN
+  CAPITAL LETTER Z) with the corresponding characters in the range U+0061 to U+007A (i.e. LATIN
+  SMALL LETTER A to LATIN SMALL LETTER Z).</p>
+
+  </div>
+
+
+  <p>A string <var data-x="">pattern</var> is a <dfn>prefix match</dfn> for a string <var
+  data-x="">s</var> when <var data-x="">pattern</var> is not longer than <var data-x="">s</var> and
+  truncating <var data-x="">s</var> to <var data-x="">pattern</var>'s length leaves the two strings as
+  matches of each other.</p>
+
+
+
+  <h3>Common microsyntaxes</h3>
+
+  <p>There are various places in HTML that accept particular data types, such as dates or numbers.
+  This section describes what the conformance criteria for content in those formats is, and how to
+  parse them.</p>
+
+  <div class="nodev">
+
+  <p class="note">Implementors are strongly urged to carefully examine any third-party libraries
+  they might consider using to implement the parsing of syntaxes described below. For example, date
+  libraries are likely to implement error handling behavior that differs from what is required in
+  this specification, since error-handling behavior is often not defined in specifications that
+  describe date syntaxes similar to those used in this specification, and thus implementations tend
+  to vary greatly in how they handle errors.</p>
+
+  </div>
+
+
+  <div class="nodev">
+
+  <h4>Common parser idioms</h4>
+
+  </div>
+
+  <p>The <dfn data-x="space character">space characters</dfn>, for the purposes of this
+  specification, are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab), U+000A LINE FEED (LF), U+000C
+  FORM FEED (FF), and U+000D CARRIAGE RETURN (CR).</p>
+
+  <p>The <dfn data-x="White_Space">White_Space characters</dfn> are those that have the Unicode
+  property "White_Space" in the Unicode <code data-x="">PropList.txt</code> data file. <a
+  href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p class="note">This should not be confused with the "White_Space" value (abbreviated "WS") of the
+  "Bidi_Class" property in the <code data-x="">Unicode.txt</code> data file.</p>
+
+  <p>The <dfn>control characters</dfn> are those whose Unicode "General_Category" property has the
+  value "Cc" in the Unicode <code data-x="">UnicodeData.txt</code> data file. <a
+  href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p>The <dfn>uppercase ASCII letters</dfn> are the characters in the range U+0041 LATIN CAPITAL
+  LETTER A to U+005A LATIN CAPITAL LETTER Z.</p>
+
+  <p>The <dfn>lowercase ASCII letters</dfn> are the characters in the range U+0061 LATIN SMALL
+  LETTER A to U+007A LATIN SMALL LETTER Z.</p>
+
+  <p>The <dfn>ASCII digits</dfn> are the characters in the range U+0030 DIGIT ZERO (0) to U+0039
+  DIGIT NINE (9).</p>
+
+  <p>The <dfn>alphanumeric ASCII characters</dfn> are those that are either <span>uppercase ASCII
+  letters</span>, <span>lowercase ASCII letters</span>, or <span>ASCII digits</span>.</p>
+
+  <p>The <dfn>ASCII hex digits</dfn> are the characters in the ranges U+0030 DIGIT ZERO (0) to
+  U+0039 DIGIT NINE (9), U+0041 LATIN CAPITAL LETTER A to U+0046 LATIN CAPITAL LETTER F, and U+0061
+  LATIN SMALL LETTER A to U+0066 LATIN SMALL LETTER F.</p>
+
+  <p>The <dfn>uppercase ASCII hex digits</dfn> are the characters in the ranges U+0030 DIGIT ZERO (0) to
+  U+0039 DIGIT NINE (9) and U+0041 LATIN CAPITAL LETTER A to U+0046 LATIN CAPITAL LETTER F only.</p>
+
+  <p>The <dfn>lowercase ASCII hex digits</dfn> are the characters in the ranges U+0030 DIGIT ZERO
+  (0) to U+0039 DIGIT NINE (9) and U+0061 LATIN SMALL LETTER A to U+0066 LATIN SMALL LETTER F
+  only.</p>
+
+  <div class="nodev">
+
+  <p>Some of the micro-parsers described below follow the pattern of having an <var
+  data-x="">input</var> variable that holds the string being parsed, and having a <var
+  data-x="">position</var> variable pointing at the next character to parse in <var
+  data-x="">input</var>.</p>
+
+  <p>For parsers based on this pattern, a step that requires the user agent to <dfn>collect a
+  sequence of characters</dfn> means that the following algorithm must be run, with <var
+  data-x="">characters</var> being the set of characters that can be collected:</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> and <var data-x="">position</var> be the same variables as
+   those of the same name in the algorithm that invoked these steps.</p></li>
+
+   <li><p>Let <var data-x="">result</var> be the empty string.</p></li>
+
+   <li><p>While <var data-x="">position</var> doesn't point past the end of <var data-x="">input</var>
+   and the character at <var data-x="">position</var> is one of the <var data-x="">characters</var>,
+   append that character to the end of <var data-x="">result</var> and advance <var
+   data-x="">position</var> to the next character in <var data-x="">input</var>.</p></li>
+
+   <li><p>Return <var data-x="">result</var>.</p></li>
+
+  </ol>
+
+  <p>The step <dfn>skip whitespace</dfn> means that the user agent must <span>collect a sequence of
+  characters</span> that are <span data-x="space character">space characters</span>. The step
+  <dfn>skip White_Space characters</dfn> means that the user agent must <span>collect a sequence of
+  characters</span> that are <span>White_Space</span> characters. In both cases, the collected
+  characters are not used. <a href="#refsUNICODE">[UNICODE]</a></p>
+
+  <p>When a user agent is to <dfn>strip line breaks</dfn> from a string, the user agent must remove
+  any U+000A LINE FEED (LF) and U+000D CARRIAGE RETURN (CR) characters from that string.</p>
+
+  <p>When a user agent is to <dfn>strip leading and trailing whitespace</dfn> from a string, the
+  user agent must remove all <span data-x="space character">space characters</span> that are at the
+  start or end of the string.</p>
+
+  <p>When a user agent is to <dfn>strip and collapse whitespace</dfn> in a string, it must replace
+  any sequence of one or more consecutive <span data-x="space character">space characters</span> in
+  that string with a single U+0020 SPACE character, and then <span>strip leading and trailing
+  whitespace</span> from that string.</p>
+
+  <p>When a user agent has to <dfn>strictly split a string</dfn> on a particular delimiter character
+  <var data-x="">delimiter</var>, it must use the following algorithm:</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p>Let <var data-x="">tokens</var> be an ordered list of tokens, initially empty.</p></li>
+
+   <li><p>While <var data-x="">position</var> is not past the end of <var data-x="">input</var>:</p>
+
+    <ol>
+
+     <li><p><span>Collect a sequence of characters</span> that are not the <var
+     data-x="">delimiter</var> character.</p></li>
+
+     <li><p>Append the string collected in the previous step to <var data-x="">tokens</var>.</p></li>
+
+     <li><p>Advance <var data-x="">position</var> to the next character in <var
+     data-x="">input</var>.</p></li> <!-- skips past the delimiter -->
+
+    </ol>
+
+   </li>
+
+   <li><p>Return <var data-x="">tokens</var>.</p></li>
+
+  </ol>
+
+  <p class="note">For the special cases of splitting a string <span data-x="split a string on
+  spaces">on spaces</span> and <span data-x="split a string on commas">on commas</span>, this
+  algorithm does not apply (those algorithms also perform <span data-x="strip leading and trailing
+  whitespace">whitespace trimming</span>).</p>
+
+  </div>
+
+
+
+  <h4>Boolean attributes</h4>
+
+  <p>A number of attributes are <dfn data-x="boolean attribute">boolean attributes</dfn>. The
+  presence of a boolean attribute on an element represents the true value, and the absence of the
+  attribute represents the false value.</p>
+
+  <p>If the attribute is present, its value must either be the empty string or a value that is an
+  <span>ASCII case-insensitive</span> match for the attribute's canonical name, with no leading or
+  trailing whitespace.</p>
+
+  <p class="note">The values "true" and "false" are not allowed on boolean attributes. To represent
+  a false value, the attribute has to be omitted altogether.</p>
+
+  <div class="example">
+
+   <p>Here is an example of a checkbox that is checked and disabled. The <code
+   data-x="attr-input-checked">checked</code> and <code data-x="attr-fe-disabled">disabled</code>
+   attributes are the boolean attributes.</p>
+
+   <pre>&lt;label>&lt;input type=checkbox checked name=cheese disabled> Cheese&lt;/label></pre>
+
+   <p>This could be equivalently written as this:
+
+   <pre>&lt;label>&lt;input type=checkbox checked=checked name=cheese disabled=disabled> Cheese&lt;/label></pre>
+
+   <p>You can also mix styles; the following is still equivalent:</p>
+
+   <pre>&lt;label>&lt;input type='checkbox' checked name=cheese disabled=""> Cheese&lt;/label></pre>
+
+  </div>
+
+
+
+  <h4>Keywords and enumerated attributes</h4>
+
+  <p>Some attributes are defined as taking one of a finite set of keywords. Such attributes are
+  called <dfn data-x="enumerated attribute">enumerated attributes</dfn>. The keywords are each
+  defined to map to a particular <em>state</em> (several keywords might map to the same state, in
+  which case some of the keywords are synonyms of each other; additionally, some of the keywords can
+  be said to be non-conforming, and are only in the specification for historical reasons). In
+  addition, two default states can be given. The first is the <i>invalid value default</i>, the
+  second is the <i>missing value default</i>.</p>
+
+  <p>If an enumerated attribute is specified, the attribute's value must be an <span>ASCII
+  case-insensitive</span> match for one of the given keywords that are not said to be
+  non-conforming, with no leading or trailing whitespace.</p>
+
+  <p>When the attribute is specified, if its value is an <span>ASCII case-insensitive</span> match
+  for one of the given keywords then that keyword's state is the state that the attribute
+  represents. If the attribute value matches none of the given keywords, but the attribute has an
+  <i>invalid value default</i>, then the attribute represents that state. Otherwise, if the
+  attribute value matches none of the keywords but there is a <i>missing value default</i> state
+  defined, then <em>that</em> is the state represented by the attribute. Otherwise, there is no
+  default, and invalid values mean that there is no state represented.</p>
+
+  <p>When the attribute is <em>not</em> specified, if there is a <i>missing value default</i> state
+  defined, then that is the state represented by the (missing) attribute. Otherwise, the absence of
+  the attribute means that there is no state represented.</p>
+
+  <p class="note">The empty string can be a valid keyword.</p>
+
+
+  <h4>Numbers</h4>
+
+  <h5>Signed integers</h5>
+
+  <p>A string is a <dfn>valid integer</dfn> if it consists of one or more <span>ASCII digits</span>,
+  optionally prefixed with a U+002D HYPHEN-MINUS character (-).</p>
+
+  <p>A <span>valid integer</span> without a U+002D HYPHEN-MINUS (-) prefix represents the number
+  that is represented in base ten by that string of digits. A <span>valid integer</span>
+  <em>with</em> a U+002D HYPHEN-MINUS (-) prefix represents the number represented in base ten by
+  the string of digits that follows the U+002D HYPHEN-MINUS, subtracted from zero.</p>
+
+  <div class="nodev">
+
+  <p>The <dfn>rules for parsing integers</dfn> are as given in the following algorithm. When
+  invoked, the steps must be followed in the order given, aborting at the first step that returns a
+  value. This algorithm will return either an integer or an error.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p>Let <var data-x="">sign</var> have the value "positive".</p></li>
+
+   <li><p><span>Skip whitespace</span>.</p></li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+    error.</p></li>
+
+   <li>
+
+    <p>If the character indicated by <var data-x="">position</var> (the first character) is a U+002D
+    HYPHEN-MINUS character (-):</p>
+
+    <ol>
+
+     <li>Let <var data-x="">sign</var> be "negative".</li>
+
+     <li>Advance <var data-x="">position</var> to the next character.</li>
+
+     <li>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+     error.</li>
+
+    </ol>
+
+    <p>Otherwise, if the character indicated by <var data-x="">position</var> (the first character)
+    is a U+002B PLUS SIGN character (+):</p>
+
+    <ol>
+
+     <li>Advance <var data-x="">position</var> to the next character. (The "<code data-x="">+</code>"
+     is ignored, but it is not conforming.)</li>
+
+     <li>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+     error.</li>
+
+    </ol>
+
+   </li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is not an <span data-x="ASCII
+   digits">ASCII digit</span>, then return an error.</p></li>
+
+   <!-- Ok. At this point we know we have a number. It might have
+   trailing garbage which we'll ignore, but it's a number, and we
+   won't return an error. -->
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>, and
+   interpret the resulting sequence as a base-ten integer. Let <var data-x="">value</var> be that
+   integer.</p></li>
+
+   <li><p>If <var data-x="">sign</var> is "positive", return <var
+   data-x="">value</var>, otherwise return the result of subtracting
+   <var data-x="">value</var> from zero.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Non-negative integers</h5>
+
+  <p>A string is a <dfn>valid non-negative integer</dfn> if it consists of one or more <span>ASCII
+  digits</span>.</p>
+
+  <p>A <span>valid non-negative integer</span> represents the number that is represented in base ten
+  by that string of digits.</p>
+
+  <div class="nodev">
+
+  <p>The <dfn>rules for parsing non-negative integers</dfn> are as given in the following algorithm.
+  When invoked, the steps must be followed in the order given, aborting at the first step that
+  returns a value. This algorithm will return either zero, a positive integer, or an error.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">value</var> be the result of parsing <var data-x="">input</var> using the
+   <span>rules for parsing integers</span>.</p></li>
+
+   <li><p>If <var data-x="">value</var> is an error, return an error.</p></li>
+
+   <li><p>If <var data-x="">value</var> is less than zero, return an error.</p></li>
+
+   <li><p>Return <var data-x="">value</var>.</p></li>
+
+  </ol>
+
+  <!-- Implications: A leading + is ignored. A leading - is ignored if the value is zero. -->
+
+  </div>
+
+
+  <h5>Floating-point numbers</h5>
+
+  <p>A string is a <dfn>valid floating-point number</dfn> if it consists of:</p>
+
+  <ol class="brief">
+
+   <li>Optionally, a U+002D HYPHEN-MINUS character (-).</li>
+
+   <li>One or both of the following, in the given order:
+
+    <ol>
+
+     <li>A series of one or more <span>ASCII digits</span>.</li>
+
+     <li>
+
+      <ol>
+
+       <li>A single U+002E FULL STOP character (.).</li>
+
+       <li>A series of one or more <span>ASCII digits</span>.</li>
+
+      </ol>
+
+     </li>
+
+    </ol>
+
+   </li>
+
+   <li>Optionally:
+
+    <ol>
+
+     <li>Either a U+0065 LATIN SMALL LETTER E character (e) or a U+0045 LATIN CAPITAL LETTER E
+     character (E).</li>
+
+     <li>Optionally, a U+002D HYPHEN-MINUS character (-) or U+002B PLUS SIGN character (+).</li>
+
+     <li>A series of one or more <span>ASCII digits</span>.</li>
+
+    </ol>
+
+   </li>
+
+  </ol>
+
+  <p>A <span>valid floating-point number</span> represents the number obtained by multiplying the
+  significand by ten raised to the power of the exponent, where the significand is the first number,
+  interpreted as base ten (including the decimal point and the number after the decimal point, if
+  any, and interpreting the significand as a negative number if the whole string starts with a
+  U+002D HYPHEN-MINUS character (-) and the number is not zero), and where the exponent is the
+  number after the E, if any (interpreted as a negative number if there is a U+002D HYPHEN-MINUS
+  character (-) between the E and the number and the number is not zero, or else ignoring a U+002B
+  PLUS SIGN character (+) between the E and the number if there is one). If there is no E, then the
+  exponent is treated as zero.</p>
+
+  <p class="note">The Infinity and Not-a-Number (NaN) values are not <span data-x="valid
+  floating-point number">valid floating-point numbers</span>.</p>
+
+  <div class="nodev">
+
+  <p>The <dfn data-x="best representation of the number as a floating-point number">best
+  representation of the number <var data-x="">n</var> as a floating-point number</dfn> is the string
+  obtained from applying the JavaScript operator ToString to <var data-x="">n</var>. The JavaScript
+  operator ToString is not uniquely determined. When there are multiple possible strings that could
+  be obtained from the JavaScript operator ToString for a particular value, the user agent must
+  always return the same string for that value (though it may differ from the value used by other
+  user agents).</p>
+
+  <p>The <dfn>rules for parsing floating-point number values</dfn> are as given in the following
+  algorithm. This algorithm must be aborted at the first step that returns something. This algorithm
+  will return either a number or an error.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p>Let <var data-x="">value</var> have the value 1.</li>
+
+   <li><p>Let <var data-x="">divisor</var> have the value 1.</p></li>
+
+   <li><p>Let <var data-x="">exponent</var> have the value 1.</p></li>
+
+   <li><p><span>Skip whitespace</span>.</p></li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+   error.</p></li>
+
+   <li>
+
+    <p>If the character indicated by <var data-x="">position</var> is a U+002D HYPHEN-MINUS character
+    (-):</p>
+
+    <ol>
+
+     <li>Change <var data-x="">value</var> and <var data-x="">divisor</var> to &#x2212;1.</li>
+
+     <li>Advance <var data-x="">position</var> to the next character.</li>
+
+     <li>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+     error.</li>
+
+    </ol>
+
+    <p>Otherwise, if the character indicated by <var data-x="">position</var> (the first character)
+    is a U+002B PLUS SIGN character (+):</p>
+
+    <ol>
+
+     <li>Advance <var data-x="">position</var> to the next character. (The "<code data-x="">+</code>"
+     is ignored, but it is not conforming.)</li>
+
+     <li>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+     error.</li>
+
+    </ol>
+
+   </li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is a U+002E FULL STOP (.), and
+   that is not the last character in <var data-x="">input</var>, and the character after the
+   character indicated by <var data-x="">position</var> is an <span data-x="ASCII digits">ASCII
+   digit</span>, then set <var data-x="">value</var> to zero and jump to the step labeled
+   <i>fraction</i>.</p> <!-- we have to check there's a number so that ".e1" fails to parse but ".0"
+   does not -->
+
+   <li><p>If the character indicated by <var data-x="">position</var> is not an <span data-x="ASCII
+   digits">ASCII digit</span>, then return an error.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>, and
+   interpret the resulting sequence as a base-ten integer. Multiply <var data-x="">value</var> by
+   that integer.</p></li>
+
+   <li>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, jump to the
+   step labeled <i>conversion</i>.</li>
+
+   <li><p><i>Fraction</i>: If the character indicated by <var data-x="">position</var> is a U+002E
+   FULL STOP (.), run these substeps:</p>
+
+    <ol>
+
+     <li><p>Advance <var data-x="">position</var> to the next character.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, or if the
+     character indicated by <var data-x="">position</var> is not an <span data-x="ASCII digits">ASCII
+     digit</span>, U+0065 LATIN SMALL LETTER E (e), or U+0045 LATIN CAPITAL LETTER E (E), then jump
+     to the step labeled <i>conversion</i>.</li>
+
+     <li><p>If the character indicated by <var data-x="">position</var> is a U+0065 LATIN SMALL
+     LETTER E character (e) or a U+0045 LATIN CAPITAL LETTER E character (E), skip the remainder of
+     these substeps.</p>
+
+     <li><p><i>Fraction loop</i>: Multiply <var data-x="">divisor</var> by ten.</p></li>
+
+     <li>Add the value of the character indicated by <var data-x="">position</var>, interpreted as a
+     base-ten digit (0..9) and divided by <var data-x="">divisor</var>, to <var
+     data-x="">value</var>.</li>
+
+     <li><p>Advance <var data-x="">position</var> to the next character.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, then jump
+     to the step labeled <i>conversion</i>.</li>
+
+     <li><p>If the character indicated by <var data-x="">position</var> is an <span data-x="ASCII
+     digits">ASCII digit</span>, jump back to the step labeled <i>fraction loop</i> in these
+     substeps.</p></li>
+
+    </ol>
+
+   </li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is a U+0065 LATIN SMALL LETTER
+   E character (e) or a U+0045 LATIN CAPITAL LETTER E character (E), run these substeps:</p>
+
+    <ol>
+
+     <li><p>Advance <var data-x="">position</var> to the next character.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, then jump
+     to the step labeled <i>conversion</i>.</li>
+
+     <li>
+
+      <p>If the character indicated by <var data-x="">position</var> is a U+002D HYPHEN-MINUS
+      character (-):</p>
+
+      <ol>
+
+       <li>Change <var data-x="">exponent</var> to &#x2212;1.</li>
+
+       <li>Advance <var data-x="">position</var> to the next character.</li>
+
+       <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, then
+       jump to the step labeled <i>conversion</i>.</li>
+
+      </ol>
+
+      <p>Otherwise, if the character indicated by <var data-x="">position</var> is a U+002B PLUS SIGN
+      character (+):</p>
+
+      <ol>
+
+       <li>Advance <var data-x="">position</var> to the next character.</li>
+
+       <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, then
+       jump to the step labeled <i>conversion</i>.</li>
+
+      </ol>
+
+     </li>
+
+     <li><p>If the character indicated by <var data-x="">position</var> is not an <span data-x="ASCII
+     digits">ASCII digit</span>, then jump to the step labeled <i>conversion</i>.</li>
+
+     <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>, and
+     interpret the resulting sequence as a base-ten integer. Multiply <var data-x="">exponent</var>
+     by that integer.</p></li>
+
+     <li><p>Multiply <var data-x="">value</var> by ten raised to the <var data-x="">exponent</var>th
+     power.</p></li>
+
+    </ol>
+
+   </li>
+
+   <li><p><i>Conversion</i>: Let <var data-x="">S</var> be the set of finite IEEE 754
+   double-precision floating-point values except &#x2212;0, but with two special values added: 2<sup
+   data-x="">1024</sup> and &#x2212;2<sup data-x="">1024</sup>.</p></li>
+
+   <li><p>Let <var data-x="">rounded-value</var> be the number in <var data-x="">S</var> that is
+   closest to <var data-x="">value</var>, selecting the number with an even significand if there are
+   two equally close values. (The two special values 2<sup data-x="">1024</sup> and &#x2212;2<sup
+   data-x="">1024</sup> are considered to have even significands for this purpose.)</p></li>
+
+   <li><p>If <var data-x="">rounded-value</var> is 2<sup data-x="">1024</sup> or &#x2212;2<sup
+   data-x="">1024</sup>, return an error.</p></li>
+
+   <li><p>Return <var data-x="">rounded-value</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+<div class="nodev">
+  <h5 id="percentages-and-dimensions">Percentages and lengths</h5>
+
+  <p>The <dfn>rules for parsing dimension values</dfn> are as given in the following algorithm. When
+  invoked, the steps must be followed in the order given, aborting at the first step that returns a
+  value. This algorithm will return either a number greater than or equal to 1.0, or an error; if a
+  number is returned, then it is further categorised as either a percentage or a length.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p><span>Skip whitespace</span>.</p></li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+   error.</p></li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is a U+002B PLUS SIGN character
+   (+), advance <var data-x="">position</var> to the next character.</li>
+
+   <li><p><span>Collect a sequence of characters</span> that are U+0030 DIGIT ZERO (0) characters,
+   and discard them.</p></li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return an
+   error.</p></li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is not one of U+0031 DIGIT ONE
+   (1) to U+0039 DIGIT NINE (9), then return an error.</p></li>
+
+   <!-- Ok. At this point we know we have a number. It might have trailing garbage which we'll
+   ignore, but it's a number, and we won't return an error. -->
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>, and
+   interpret the resulting sequence as a base-ten integer. Let <var data-x="">value</var> be that
+   number.</li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return <var
+   data-x="">value</var> as a length.</p></li>
+
+   <li>
+
+    <p>If the character indicated by <var data-x="">position</var> is a U+002E FULL STOP character
+    (.):</p>
+
+    <ol>
+
+     <li><p>Advance <var data-x="">position</var> to the next character.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, or if the
+     character indicated by <var data-x="">position</var> is not an <span data-x="ASCII digits">ASCII
+     digit</span>, then return <var data-x="">value</var> as a length.</li>
+
+     <li><p>Let <var data-x="">divisor</var> have the value 1.</p></li>
+
+     <li><p><i>Fraction loop</i>: Multiply <var data-x="">divisor</var> by ten.</p></li>
+
+     <li>Add the value of the character indicated by <var data-x="">position</var>, interpreted as a
+     base-ten digit (0..9) and divided by <var data-x="">divisor</var>, to <var
+     data-x="">value</var>.</li>
+
+     <li><p>Advance <var data-x="">position</var> to the next character.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, then
+     return <var data-x="">value</var> as a length.</li>
+
+     <li><p>If the character indicated by <var data-x="">position</var> is an <span data-x="ASCII
+     digits">ASCII digit</span>, return to the step labeled <i>fraction loop</i> in these
+     substeps.</p></li>
+
+    </ol>
+
+   </li>
+
+   <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, return <var
+   data-x="">value</var> as a length.</p></li>
+
+   <li><p>If the character indicated by <var data-x="">position</var> is a U+0025 PERCENT SIGN
+   character (%), return <var data-x="">value</var> as a percentage.</p></li>
+
+   <li><p>Return <var data-x="">value</var> as a length.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Lists of integers</h5>
+
+  <p>A <dfn>valid list of integers</dfn> is a number of <span data-x="valid integer">valid
+  integers</span> separated by U+002C COMMA characters, with no other characters (e.g. no <span
+  data-x="space character">space characters</span>). In addition, there might be restrictions on the
+  number of integers that can be given, or on the range of values allowed.</p>
+
+  <div class="nodev">
+
+  <p>The <dfn>rules for parsing a list of integers</dfn> are as follows:</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p>Let <var data-x="">numbers</var> be an initially empty list of integers. This list will be
+   the result of this algorithm.</p></li>
+
+   <li><p>If there is a character in the string <var data-x="">input</var> at position <var
+   data-x="">position</var>, and it is either a U+0020 SPACE, U+002C COMMA, or U+003B SEMICOLON
+   character, then advance <var data-x="">position</var> to the next character in <var
+   data-x="">input</var>, or to beyond the end of the string if there are no more
+   characters.</p></li>
+
+   <li><p>If <var data-x="">position</var> points to beyond the end of <var data-x="">input</var>,
+   return <var data-x="">numbers</var> and abort.</p></li>
+
+   <li><p>If the character in the string <var data-x="">input</var> at position <var
+   data-x="">position</var> is a U+0020 SPACE, U+002C COMMA, or U+003B SEMICOLON character, then
+   return to step 4.</li>
+
+   <li><p>Let <var data-x="">negated</var> be false.</p></li> <li><p>Let <var data-x="">value</var> be
+   0.</p></li>
+
+   <li><p>Let <var data-x="">started</var> be false. This variable is set to true when the parser
+   sees a number or a U+002D HYPHEN-MINUS character (-).</p></li>
+
+   <li><p>Let <var data-x="">got number</var> be false. This variable is set to true when the parser
+   sees a number.</p></li>
+
+   <li><p>Let <var data-x="">finished</var> be false. This variable is set to true to switch parser
+   into a mode where it ignores characters until the next separator.</p></li>
+
+   <li><p>Let <var data-x="">bogus</var> be false.</p></li>
+
+   <li><p><i>Parser</i>: If the character in the string <var data-x="">input</var> at position <var
+   data-x="">position</var> is:</p>
+
+    <dl class="switch">
+
+     <dt>A U+002D HYPHEN-MINUS character</dt>
+
+     <dd>
+
+      <p>Follow these substeps:</p>
+
+      <ol>
+
+       <li>If <var data-x="">got number</var> is true, let <var data-x="">finished</var> be true.</li>
+
+       <li>If <var data-x="">finished</var> is true, skip to the next step in the overall set of
+       steps.</li>
+
+       <li>If <var data-x="">started</var> is true, let <var data-x="">negated</var> be false.</li>
+
+       <li>Otherwise, if <var data-x="">started</var> is false and if <var data-x="">bogus</var> is
+       false, let <var data-x="">negated</var> be true.</li>
+
+       <li>Let <var data-x="">started</var> be true.</li>
+
+      </ol>
+
+     </dd>
+
+     <dt>An <span data-x="ASCII digits">ASCII digit</span></dt>
+
+     <dd>
+
+      <p>Follow these substeps:</p>
+
+      <ol>
+
+       <li>If <var data-x="">finished</var> is true, skip to the next step in the overall set of
+       steps.</li>
+
+       <li>Multiply <var data-x="">value</var> by ten.</li>
+
+       <li>Add the value of the digit, interpreted in base ten, to <var data-x="">value</var>.</li>
+
+       <li>Let <var data-x="">started</var> be true.</li>
+
+       <li>Let <var data-x="">got number</var> be true.</li>
+
+      </ol>
+
+     </dd>
+
+
+     <dt>A U+0020 SPACE character</dt>
+     <dt>A U+002C COMMA character</dt>
+     <dt>A U+003B SEMICOLON character</dt>
+
+     <dd>
+
+      <p>Follow these substeps:</p>
+
+      <ol>
+
+       <li>If <var data-x="">got number</var> is false, return the <var data-x="">numbers</var> list
+       and abort. This happens if an entry in the list has no digits, as in "<code
+       data-x="">1,2,x,4</code>".</li>
+
+       <li>If <var data-x="">negated</var> is true, then negate <var data-x="">value</var>.</li>
+
+       <li>Append <var data-x="">value</var> to the <var data-x="">numbers</var> list.</li>
+
+       <li>Jump to step 4 in the overall set of steps.</li>
+
+      </ol>
+
+     </dd>
+
+
+     <!-- <dt>A U+002E FULL STOP character</dt> -->
+     <dt>A character in the range U+0001 to U+001F, <!-- space --> U+0021 to U+002B, <!-- comma --> U+002D to U+002F, <!-- digits --> U+003A, <!-- semicolon --> U+003C to U+0040, <!-- a-z --> U+005B to U+0060, <!-- A-Z --> U+007b to U+007F
+        (i.e. any other non-alphabetic ASCII character)</dt>
+
+ <!--
+ Test: http://www.hixie.ch/tests/adhoc/html/flow/image-maps/004-demo.html
+ IE6 on Wine treats the following characters like this also: U+1-U+1f, U+21-U+2b, U+2d-U+2f, U+3a,
+ U+3c-U+40, U+5b-U+60, U+7b-U+82, U+84-U+89, U+8b, U+8d, U+8f-U+99, U+9b, U+9d, U+a0-U+bf, U+d7,
+ U+f7, U+1f6-U+1f9, U+218-U+24f, U+2a9-U+385, U+387, U+38b, U+38d, U+3a2, U+3cf, U+3d7-U+3d9, U+3db,
+ U+3dd, U+3df, U+3e1, U+3f4-U+400, U+40d, U+450, U+45d, U+482-U+48f, U+4c5-U+4c6, U+4c9-U+4ca,
+ U+4cd-U+4cf, U+4ec-U+4ed, U+4f6-U+4f7, U+4fa-U+530, U+557-U+560, U+588-U+5cf, U+5eb-U+5ef,
+ U+5f3-U+620, U+63b-U+640, U+64b-U+670, U+6b8-U+6b9, U+6bf, U+6cf, U+6d4, U+6d6-U+904, U+93a-U+957,
+ U+962-U+984, U+98d-U+98e, U+991-U+992, U+9a9, U+9b1, U+9b3-U+9b5, U+9ba-U+9db, U+9de, U+9e2-U+9ef,
+ U+9f2-U+a04, U+a0b-U+a0e, U+a11-U+a12, U+a29, U+a31, U+a34, U+a37, U+a3a-U+a58, U+a5d, U+a5f-U+a84,
+ U+a8c, U+a8e, U+a92, U+aa9, U+ab1, U+ab4, U+aba-U+adf, U+ae1-U+b04, U+b0d-U+b0e, U+b11-U+b12,
+ U+b29, U+b31, U+b34-U+b35, U+b3a-U+b5b, U+b5e, U+b62-U+b84, U+b8b-U+b8d, U+b91, U+b96-U+b98, U+b9b,
+ U+b9d, U+ba0-U+ba2, U+ba5-U+ba7, U+bab-U+bad, U+bb6, U+bba-U+c04, U+c0d, U+c11, U+c29, U+c34,
+ U+c3a-U+c5f, U+c62-U+c84, U+c8d, U+c91, U+ca9, U+cb4, U+cba-U+cdd, U+cdf, U+ce2-U+d04, U+d0d,
+ U+d11, U+d29, U+d3a-U+d5f, U+d62-U+e00, U+e2f, U+e31, U+e34-U+e3f, U+e46-U+e80, U+e83, U+e85-U+e86,
+ U+e89, U+e8b-U+e8c, U+e8e-U+e93, U+e98, U+ea0, U+ea4, U+ea6, U+ea8-U+ea9, U+eac, U+eaf-U+edb,
+ U+ede-U+109f, U+10c6-U+10cf, U+10f7-U+10ff, U+115a-U+115e, U+11a3-U+11a7, U+11fa-U+1dff,
+ U+1e9b-U+1e9f, U+1efa-U+1eff, U+1f16-U+1f17, U+1f1e-U+1f1f, U+1f46-U+1f47, U+1f4e-U+1f4f, U+1f58,
+ U+1f5a, U+1f5c, U+1f5e, U+1f7e-U+1f7f, U+1fb5, U+1fbd-U+1fc1, U+1fc5, U+1fcd-U+1fcf, U+1fd4-U+1fd5,
+ U+1fdc-U+1fdf, U+1fed-U+1ff1, U+1ff5, U+1ffd-U+249b, U+24ea-U+3004, U+3006-U+3040, U+3095-U+309a,
+ U+309f-U+30a0, U+30fb, U+30ff-U+3104, U+312d-U+3130, U+318f-U+4dff, U+9fa6-U+abff, U+d7a4-U+d7ff,
+ U+e000-U+f8ff, U+fa2e-U+faff, U+fb07-U+fb12, U+fb18-U+fb1e, U+fb37, U+fb3d, U+fb3f, U+fb42, U+fb45,
+ U+fbb2-U+fbd2, U+fbe9, U+fce1, U+fd3e-U+fd4f, U+fd90-U+fd91, U+fdc8-U+fdef, U+fdfc-U+fe7f,
+ U+fefd-U+ff20, U+ff3b-U+ff40, U+ff5b-U+ff65, U+ffa0, U+ffbf-U+ffc1, U+ffc8-U+ffc9, U+ffd0-U+ffd1,
+ U+ffd8-U+ffd9, U+ffdd-U+ffff
+ IE7 on Win2003 treats the following characters like this also instead: U+1-U+1f, U+21-U+2b,
+ U+2d-U+2f, U+3a, U+3c-U+40, U+5b-U+60, U+7b-U+82, U+84-U+89, U+8b, U+8d, U+8f-U+99, U+9b, U+9d,
+ U+a0-U+a9, U+ab-U+b4, U+b6-U+b9, U+bb-U+bf, U+d7, U+f7, U+220-U+221, U+234-U+24f, U+2ae-U+2af,
+ U+2b9-U+2ba, U+2c2-U+2df, U+2e5-U+2ed, U+2ef-U+344, U+346-U+379, U+37b-U+385, U+387, U+38b, U+38d,
+ U+3a2, U+3cf, U+3d8-U+3d9, U+3f4-U+3ff, U+482-U+48b, U+4c5-U+4c6, U+4c9-U+4ca, U+4cd-U+4cf,
+ U+4f6-U+4f7, U+4fa-U+530, U+557-U+558, U+55a-U+560, U+588-U+5cf, U+5eb-U+5ef, U+5f3-U+620,
+ U+63b-U+640, U+656-U+66f, U+6d4, U+6dd-U+6e0, U+6e9-U+6ec, U+6ee-U+6f9, U+6fd-U+70f, U+72d-U+72f,
+ U+740-U+77f, U+7b1-U+900, U+904, U+93a-U+93c, U+94d - U+94f, U+951-U+957, U+964-U+980, U+984,
+ U+98d-U+98e, U+991-U+992, U+9a9, U+9b1, U+9b3-U+9b5, U+9ba-U+9bd, U+9c5-U+9c6, U+9c9-U+9ca,
+ U+9cd-U+9d6, U+9d8-U+9db, U+9de, U+9e4-U+9ef, U+9f2-U+a01, U+a03-U+a04, U+a0b-U+a0e, U+a11-U+a12,
+ U+a29, U+a31, U+a34, U+a37, U+a3a-U+a3d, U+a43-U+a46, U+a49-U+a4a, U+a4d-U+a58, U+a5d, U+a5f-U+a6f,
+ U+a75-U+a80, U+a84, U+a8c, U+a8e, U+a92, U+aa9, U+ab1, U+ab4, U+aba-U+abc, U+ac6, U+aca,
+ U+acd-U+acf, U+ad1-U+adf, U+ae1-U+b00, U+b04, U+b0d-U+b0e, U+b11-U+b12, U+b29, U+b31, U+b34-U+b35,
+ U+b3a-U+b3c, U+b44-U+b46, U+b49 - U+b4a, U+b4d-U+b55, U+b58-U+b5b, U+b5e, U+b62-U+b81, U+b84,
+ U+b8b-U+b8d, U+b91, U+b96-U+b98, U+b9b, U+b9d, U+ba0 - U+ba2, U+ba5-U+ba7, U+bab-U+bad, U+bb6,
+ U+bba-U+bbd, U+bc3-U+bc5, U+bc9, U+bcd-U+bd6, U+bd8-U+c00, U+c04, U+c0d, U+c11, U+c29, U+c34,
+ U+c3a-U+c3d, U+c45, U+c49, U+c4d-U+c54, U+c57-U+c5f, U+c62-U+c81, U+c84, U+c8d, U+c91, U+ca9,
+ U+cb4, U+cba-U+cbd, U+cc5, U+cc9, U+ccd-U+cd4, U+cd7-U+cdd, U+cdf, U+ce2-U+d01, U+d04, U+d0d,
+ U+d11, U+d29, U+d3a-U+d3d, U+d44-U+d45, U+d49, U+d4d-U+d56, U+d58-U+d5f, U+d62-U+d81, U+d84,
+ U+d97-U+d99, U+db2, U+dbc, U+dbe - U+dbf, U+dc7-U+dce, U+dd5, U+dd7, U+de0-U+df1, U+df4-U+e00,
+ U+e3b-U+e3f, U+e4f-U+e80, U+e83, U+e85-U+e86, U+e89, U+e8b-U+e8c, U+e8e-U+e93, U+e98, U+ea0, U+ea4,
+ U+ea6, U+ea8-U+ea9, U+eac, U+eba, U+ebe-U+ebf, U+ec5-U+ecc, U+ece-U+edb, U+ede-U+eff, U+f01-U+f3f,
+ U+f48, U+f6b-U+f70, U+f82-U+f87, U+f8c-U+f8f, U+f98, U+fbd-U+fff, U+1022, U+1028, U+102b,
+ U+1033-U+1035, U+1037, U+1039-U+104f, U+105a-U+109f, U+10c6-U+10cf, U+10f7-U+10ff, U+115a - U+115e,
+ U+11a3-U+11a7, U+11fa-U+11ff, U+1207, U+1247, U+1249, U+124e-U+124f, U+1257, U+1259, U+125e-U+125f,
+ U+1287, U+1289, U+128e-U+128f, U+12af, U+12b1, U+12b6-U+12b7, U+12bf, U+12c1, U+12c6-U+12c7,
+ U+12cf, U+12d7, U+12ef, U+130f, U+1311, U+1316-U+1317, U+131f, U+1347, U+135b-U+139f,
+ U+13f5-U+1400, U+166d-U+166e, U+1677-U+1680, U+169b - U+169f, U+16eb-U+177f, U+17c9-U+181f, U+1843,
+ U+1878-U+187f, U+18aa-U+1dff, U+1e9c-U+1e9f, U+1efa-U+1eff, U+1f16-U+1f17, U+1f1e-U+1f1f,
+ U+1f46-U+1f47, U+1f4e-U+1f4f, U+1f58, U+1f5a, U+1f5c, U+1f5e, U+1f7e-U+1f7f, U+1fb5, U+1fbd,
+ U+1fbf-U+1fc1, U+1fc5, U+1fcd-U+1fcf, U+1fd4-U+1fd5, U+1fdc-U+1fdf, U+1fed-U+1ff1, U+1ff5,
+ U+1ffd-U+207e, U+2080-U+2101, U+2103-U+2106, U+2108-U+2109, U+2114, U+2116-U+2118, U+211e-U+2123,
+ U+2125, U+2127, U+2129, U+212e, U+2132, U+213a-U+215f, U+2184-U+3005, U+3008-U+3020, U+302a-U+3037,
+ U+303b-U+3104, U+312d-U+3130, U+318f - U+319f, U+31b8-U+33ff, U+4db6-U+4dff, U+9fa6-U+9fff,
+ U+a48d-U+abff, U+d7a4-U+d7ff, U+e000-U+f8ff, U+fa2e-U+faff, U+fb07-U+fb12, U+fb18-U+fb1c, U+fb1e,
+ U+fb29, U+fb37, U+fb3d, U+fb3f, U+fb42, U+fb45, U+fbb2-U+fbd2, U+fd3e-U+fd4f, U+fd90-U+fd91,
+ U+fdc8-U+fdef, U+fdfc-U+fe6f, U+fe73, U+fe75, U+fefd-U+ff20, U+ff3b-U+ff40, U+ff5b-U+ff9f,
+ U+ffbf-U+ffc1, U+ffc8-U+ffc9, U+ffd0-U+ffd1, U+ffd8-U+ffd9, U+ffdd-U+ffff
+-->
+
+     <dd>
+
+      <p>Follow these substeps:</p>
+
+      <ol>
+
+       <li>If <var data-x="">got number</var> is true, let <var data-x="">finished</var> be true.</li>
+
+       <li>If <var data-x="">finished</var> is true, skip to the next step in the overall set of
+       steps.</li>
+
+       <li>Let <var data-x="">negated</var> be false.</li>
+
+      </ol>
+
+     </dd>
+
+
+     <dt>Any other character</dt>
+     <!-- alphabetic a-z A-Z, and non-ASCII -->
+
+     <dd>
+
+      <p>Follow these substeps:</p>
+
+      <ol>
+
+       <li>If <var data-x="">finished</var> is true, skip to the next step in the overall set of
+       steps.</li>
+
+       <li>Let <var data-x="">negated</var> be false.</li>
+
+       <li>Let <var data-x="">bogus</var> be true.</li>
+
+       <li>If <var data-x="">started</var> is true, then return the <var data-x="">numbers</var> list,
+       and abort. (The value in <var data-x="">value</var> is not appended to the list first; it is
+       dropped.)</li>
+
+      </ol>
+
+     </dd>
+
+    </dl>
+
+   </li>
+
+   <li><p>Advance <var data-x="">position</var> to the next character in <var data-x="">input</var>,
+   or to beyond the end of the string if there are no more characters.</p></li>
+
+   <li><p>If <var data-x="">position</var> points to a character (and not to beyond the end of <var
+   data-x="">input</var>), jump to the big <i>Parser</i> step above.</p></li>
+
+   <li><p>If <var data-x="">negated</var> is true, then negate <var data-x="">value</var>.</li>
+
+   <li><p>If <var data-x="">got number</var> is true, then append <var data-x="">value</var> to the
+   <var data-x="">numbers</var> list.</li>
+
+   <li><p>Return the <var data-x="">numbers</var> list and abort.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <div class="nodev">
+
+  <h5>Lists of dimensions</h5>
+
+  <!-- no definition of a type since no conforming feature uses this syntax (it's only used in
+  cols="" and rows="" on <frameset> elements -->
+
+  <p>The <dfn>rules for parsing a list of dimensions</dfn> are as follows. These rules return a list
+  of zero or more pairs consisting of a number and a unit, the unit being one of <i>percentage</i>,
+  <i>relative</i>, and <i>absolute</i>.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">raw input</var> be the string being parsed.</p></li>
+
+   <li><p>If the last character in <var data-x="">raw input</var> is a U+002C COMMA character (,),
+   then remove that character from <var data-x="">raw input</var>.</p></li>
+
+   <li><p><span data-x="split a string on commas">Split the string <var data-x="">raw input</var> on
+   commas</span>. Let <var data-x="">raw tokens</var> be the resulting list of tokens.</p></li>
+
+   <li><p>Let <var data-x="">result</var> be an empty list of number/unit pairs.</p></li>
+
+   <li>
+
+    <p>For each token in <var data-x="">raw tokens</var>, run the following substeps:</p>
+
+    <ol>
+
+     <li><p>Let <var data-x="">input</var> be the token.</p></li>
+
+     <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>,
+     initially pointing at the start of the string.</p></li>
+
+     <li><p>Let <var data-x="">value</var> be the number 0.</p></li>
+
+     <li><p>Let <var data-x="">unit</var> be <i>absolute</i>.</p></li>
+
+     <li><p>If <var data-x="">position</var> is past the end of <var data-x="">input</var>, set <var
+     data-x="">unit</var> to <i>relative</i> and jump to the last substep.</p></li>
+
+     <li><p>If the character at <var data-x="">position</var> is an <span data-x="ASCII
+     digits">ASCII digit</span>, <span>collect a sequence of characters</span> that are <span>ASCII
+     digits</span>, interpret the resulting sequence as an integer in base ten, and increment <var
+     data-x="">value</var> by that integer.</p></li>
+
+     <li>
+
+      <p>If the character at <var data-x="">position</var> is a U+002E FULL STOP character (.), run
+      these substeps:</p>
+
+      <ol>
+
+       <li><p><span>Collect a sequence of characters</span> consisting of <span data-x="space
+       character">space characters</span> and <span>ASCII digits</span>. Let <var data-x="">s</var>
+       be the resulting sequence.</p></li>
+
+       <li><p>Remove all <span data-x="space character">space characters</span> in <var
+       data-x="">s</var>.</p></li>
+
+       <li>
+
+        <p>If <var data-x="">s</var> is not the empty string, run these subsubsteps:</p>
+
+        <ol>
+
+         <li><p>Let <var data-x="">length</var> be the number of characters in <var
+         data-x="">s</var> (after the spaces were removed).</p></li>
+
+         <li><p>Let <var data-x="">fraction</var> be the result of interpreting <var
+         data-x="">s</var> as a base-ten integer, and then dividing that number by <span
+         data-x="">10<sup data-x=""><var data-x="">length</var></sup></span>.</li>
+
+         <li><p>Increment <var data-x="">value</var> by <var data-x="">fraction</var>.</p></li>
+
+        </ol>
+
+       </li>
+
+      </ol>
+
+     </li>
+
+     <li><p><span>Skip whitespace</span>.</p></li>
+
+     <li>
+
+      <p>If the character at <var data-x="">position</var> is a U+0025 PERCENT SIGN character (%),
+      then set <var data-x="">unit</var> to <i>percentage</i>.</p>
+
+      <p>Otherwise, if the character at <var data-x="">position</var> is a U+002A ASTERISK character
+      (*), then set <var data-x="">unit</var> to <i>relative</i>.</p>
+
+     </li>
+
+     <!-- the remaining characters in /input/ are ignored -->
+
+     <li><p>Add an entry to <var data-x="">result</var> consisting of the number given by <var
+     data-x="">value</var> and the unit given by <var data-x="">unit</var>.</p></li>
+
+    </ol>
+
+   </li>
+
+   <li><p>Return the list <var data-x="">result</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h4>Dates and times</h4>
+
+  <p>In the algorithms below, the <dfn>number of days in month <var data-x="">month</var> of year
+  <var data-x="">year</var></dfn> is: <em>31</em> if <var data-x="">month</var> is 1, 3, 5, 7, 8,
+  10, or 12; <em>30</em> if <var data-x="">month</var> is 4, 6, 9, or 11; <em>29</em> if <var
+  data-x="">month</var> is 2 and <var data-x="">year</var> is a number divisible by 400, or if <var
+  data-x="">year</var> is a number divisible by 4 but not by 100; and <em>28</em> otherwise. This
+  takes into account leap years in the Gregorian calendar. <a
+  href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p>When <span>ASCII digits</span> are used in the date and time syntaxes defined in this section,
+  they express numbers in base ten.</p>
+
+  <div class="nodev">
+
+  <p class="note">While the formats described here are intended to be subsets of the corresponding
+  ISO8601 formats, this specification defines parsing rules in much more detail than ISO8601.
+  Implementors are therefore encouraged to carefully examine any date parsing libraries before using
+  them to implement the parsing rules described below; ISO8601 libraries might not parse dates and
+  times in exactly the same manner. <a href="#refsISO8601">[ISO8601]</a></p>
+
+  </div>
+
+  <p>Where this specification refers to the <dfn>proleptic Gregorian calendar</dfn>, it means the
+  modern Gregorian calendar, extrapolated backwards to year 1. A date in the <span>proleptic
+  Gregorian calendar</span>, sometimes explicitly referred to as a <dfn>proleptic-Gregorian
+  date</dfn>, is one that is described using that calendar even if that calendar was not in use at
+  the time (or place) in question. <a href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p class="note">The use of the Gregorian calendar as the wire format in this specification is an
+  arbitrary choice resulting from the cultural biases of those involved in the decision. See also
+  the section discussing <a href="#input-author-notes">date, time, and number formats</a> in forms
+  <span class="nodev">(for authors), <a href="#input-impl-notes">implemention notes regarding
+  localization of form controls</a>,</span> and the <code>time</code> element.</p>
+
+
+  <h5>Months</h5>
+
+  <p>A <dfn data-x="concept-month">month</dfn> consists of a specific <span>proleptic-Gregorian
+  date</span> with no time-zone information and no date information beyond a year and a month. <a
+  href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p>A string is a <dfn>valid month string</dfn> representing a year <var data-x="">year</var> and
+  month <var data-x="">month</var> if it consists of the following components in the given order:</p>
+
+  <ol>
+
+   <li>Four or more <span>ASCII digits</span>, representing <var data-x="">year</var>, where <var
+   data-x="">year</var>&nbsp;&gt;&nbsp;0</li>
+
+   <li>A U+002D HYPHEN-MINUS character (-)</li>
+
+   <li>Two <span>ASCII digits</span>, representing the month <var data-x="">month</var>, in the range
+   1&nbsp;&le;&nbsp;<var data-x="">month</var>&nbsp;&le;&nbsp;12</li>
+
+  </ol>
+
+  <div class="nodev">
+
+  <p>The rules to <dfn>parse a month string</dfn> are as follows. This will return either a year and
+  month, or nothing. If at any point the algorithm says that it "fails", this means that it is
+  aborted at that point and returns nothing.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p><span>Parse a month component</span> to obtain <var data-x="">year</var> and <var
+   data-x="">month</var>. If this returns nothing, then fail.</p>
+
+   <li><p>If <var data-x="">position</var> is <em>not</em> beyond the
+   end of <var data-x="">input</var>, then fail.</p></li>
+
+   <li><p>Return <var data-x="">year</var> and <var data-x="">month</var>.</p></li>
+
+  </ol>
+
+  <p>The rules to <dfn>parse a month component</dfn>, given an <var data-x="">input</var> string and
+  a <var data-x="">position</var>, are as follows. This will return either a year and a month, or
+  nothing. If at any point the algorithm says that it "fails", this means that it is aborted at that
+  point and returns nothing.</p>
+
+  <ol>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not at least four characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">year</var>.</p></li>
+
+   <li><p>If <var data-x="">year</var> is not a number greater than zero, then fail.</p></li>
+
+   <li><p>If <var data-x="">position</var> is beyond the end of <var data-x="">input</var> or if the
+   character at <var data-x="">position</var> is not a U+002D HYPHEN-MINUS character, then fail.
+   Otherwise, move <var data-x="">position</var> forwards one character.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">month</var>.</p></li>
+
+   <li><p>If <var data-x="">month</var> is not a number in the range 1&nbsp;&le;&nbsp;<var
+   data-x="">month</var>&nbsp;&le;&nbsp;12, then fail.</p></li>
+
+   <li><p>Return <var data-x="">year</var> and <var data-x="">month</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Dates</h5>
+
+  <p>A <dfn data-x="concept-date">date</dfn> consists of a specific <span>proleptic-Gregorian
+  date</span> with no time-zone information, consisting of a year, a month, and a day. <a
+  href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p>A string is a <dfn>valid date string</dfn> representing a year <var data-x="">year</var>, month
+  <var data-x="">month</var>, and day <var data-x="">day</var> if it consists of the following
+  components in the given order:</p>
+
+  <ol>
+
+   <li>A <span>valid month string</span>, representing <var data-x="">year</var> and <var
+   data-x="">month</var></li>
+
+   <li>A U+002D HYPHEN-MINUS character (-)</li>
+
+   <li>Two <span>ASCII digits</span>, representing <var data-x="">day</var>, in the range
+   1&nbsp;&le;&nbsp;<var data-x="">day</var>&nbsp;&le;&nbsp;<var data-x="">maxday</var> where <var
+   data-x="">maxday</var> is the <span data-x="number of days in month month of year year">number of
+   days in the month <var data-x="">month</var> and year <var data-x="">year</var></span></li>
+
+  </ol>
+
+  <div class="nodev">
+
+  <p>The rules to <dfn>parse a date string</dfn> are as follows. This will return either a date, or
+  nothing. If at any point the algorithm says that it "fails", this means that it is aborted at that
+  point and returns nothing.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p><span>Parse a date component</span> to obtain <var data-x="">year</var>, <var
+   data-x="">month</var>, and <var data-x="">day</var>. If this returns nothing, then fail.</p>
+
+   <li><p>If <var data-x="">position</var> is <em>not</em> beyond the end of <var
+   data-x="">input</var>, then fail.</p></li>
+
+   <li><p>Let <var data-x="">date</var> be the date with year <var data-x="">year</var>, month <var
+   data-x="">month</var>, and day <var data-x="">day</var>.</p></li>
+
+   <li><p>Return <var data-x="">date</var>.</p></li>
+
+  </ol>
+
+  <p>The rules to <dfn>parse a date component</dfn>, given an <var data-x="">input</var> string and a
+  <var data-x="">position</var>, are as follows. This will return either a year, a month, and a day,
+  or nothing. If at any point the algorithm says that it "fails", this means that it is aborted at
+  that point and returns nothing.</p>
+
+  <ol>
+
+   <li><p><span>Parse a month component</span> to obtain <var data-x="">year</var> and <var
+   data-x="">month</var>. If this returns nothing, then fail.</li>
+
+   <li><p>Let <var data-x="">maxday</var> be the <span>number of days in month <var
+   data-x="">month</var> of year <var data-x="">year</var></span>.</p></li>
+
+   <li><p>If <var data-x="">position</var> is beyond the end of <var data-x="">input</var> or if the
+   character at <var data-x="">position</var> is not a U+002D HYPHEN-MINUS character, then fail.
+   Otherwise, move <var data-x="">position</var> forwards one character.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">day</var>.</p></li>
+
+   <li><p>If <var data-x="">day</var> is not a number in the range 1&nbsp;&le;&nbsp;<var
+   data-x="">day</var>&nbsp;&le;&nbsp;<var data-x="">maxday</var>, then fail.</li>
+
+   <li><p>Return <var data-x="">year</var>, <var data-x="">month</var>, and <var
+   data-x="">day</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Yearless dates</h5>
+
+  <p>A <dfn data-x="concept-yearless-date">yearless date</dfn> consists of a Gregorian month and a
+  day within that month, but with no associated year. <a href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p>A string is a <dfn>valid yearless date string</dfn> representing a month <var
+  data-x="">month</var> and a day <var data-x="">day</var> if it consists of the following components
+  in the given order:</p>
+
+  <ol>
+
+   <li>Optionally, two U+002D HYPHEN-MINUS characters (-)</li>
+
+   <li>Two <span>ASCII digits</span>, representing the month <var data-x="">month</var>, in the range
+   1&nbsp;&le;&nbsp;<var data-x="">month</var>&nbsp;&le;&nbsp;12</li>
+
+   <li>A U+002D HYPHEN-MINUS character (-)</li>
+
+   <li>Two <span>ASCII digits</span>, representing <var data-x="">day</var>, in the range
+   1&nbsp;&le;&nbsp;<var data-x="">day</var>&nbsp;&le;&nbsp;<var data-x="">maxday</var> where <var
+   data-x="">maxday</var> is the <span data-x="number of days in month month of year year">number of
+   days</span> in the month <var data-x="">month</var> and any arbitrary leap year (e.g. 4 or
+   2000)</li>
+
+  </ol>
+
+  <p class="note">In other words, if the <var data-x="">month</var> is "<code data-x="">02</code>",
+  meaning February, then the day can be 29, as if the year was a leap year.</p>
+
+  <div class="nodev">
+
+  <p>The rules to <dfn>parse a yearless date string</dfn> are as follows. This will return either a
+  month and a day, or nothing. If at any point the algorithm says that it "fails", this means that
+  it is aborted at that point and returns nothing.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p><span>Parse a yearless date component</span> to obtain <var data-x="">month</var> and <var
+   data-x="">day</var>. If this returns nothing, then fail.</p>
+
+   <li><p>If <var data-x="">position</var> is <em>not</em> beyond the end of <var
+   data-x="">input</var>, then fail.</p></li>
+
+   <li><p>Return <var data-x="">month</var> and <var data-x="">day</var>.</p></li>
+
+  </ol>
+
+  <p>The rules to <dfn>parse a yearless date component</dfn>, given an <var data-x="">input</var>
+  string and a <var data-x="">position</var>, are as follows. This will return either a month and a
+  day, or nothing. If at any point the algorithm says that it "fails", this means that it is aborted
+  at that point and returns nothing.</p>
+
+  <ol>
+
+   <li><p><span>Collect a sequence of characters</span> that are U+002D HYPHEN-MINUS characters (-).
+   If the collected sequence is not exactly zero or two characters long, then fail.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">month</var>.</p></li>
+
+   <li><p>If <var data-x="">month</var> is not a number in the range 1&nbsp;&le;&nbsp;<var
+   data-x="">month</var>&nbsp;&le;&nbsp;12, then fail.</p></li>
+
+   <li><p>Let <var data-x="">maxday</var> be the <span data-x="number of days in month month of year
+   year">number of days</span> in month <var data-x="">month</var> of any arbitrary leap year (e.g. 4
+   or 2000).</p></li>
+
+   <li><p>If <var data-x="">position</var> is beyond the end of <var data-x="">input</var> or if the
+   character at <var data-x="">position</var> is not a U+002D HYPHEN-MINUS character, then fail.
+   Otherwise, move <var data-x="">position</var> forwards one character.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">day</var>.</p></li>
+
+   <li><p>If <var data-x="">day</var> is not a number in the range 1&nbsp;&le;&nbsp;<var
+   data-x="">day</var>&nbsp;&le;&nbsp;<var data-x="">maxday</var>, then fail.</li>
+
+   <li><p>Return <var data-x="">month</var> and <var data-x="">day</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Times</h5>
+
+  <p>A <dfn data-x="concept-time">time</dfn> consists of a specific time with no time-zone
+  information, consisting of an hour, a minute, a second, and a fraction of a second.</p>
+
+  <p>A string is a <dfn>valid time string</dfn> representing an hour <var data-x="">hour</var>, a
+  minute <var data-x="">minute</var>, and a second <var data-x="">second</var> if it consists of the
+  following components in the given order:</p>
+
+  <ol>
+
+   <li>Two <span>ASCII digits</span>, representing <var data-x="">hour</var>, in the range
+   0&nbsp;&le;&nbsp;<var data-x="">hour</var>&nbsp;&le;&nbsp;23</li>
+
+   <li>A U+003A COLON character (:)</li>
+
+   <li>Two <span>ASCII digits</span>, representing <var data-x="">minute</var>, in the range
+   0&nbsp;&le;&nbsp;<var data-x="">minute</var>&nbsp;&le;&nbsp;59</li>
+
+   <li>If <var data-x="">second</var> is non-zero, or optionally if <var data-x="">second</var> is
+   zero:
+
+    <ol>
+
+     <li>A U+003A COLON character (:)</li>
+
+     <li>Two <span>ASCII digits</span>, representing the integer part of <var data-x="">second</var>,
+     in the range 0&nbsp;&le;&nbsp;<var data-x="">s</var>&nbsp;&le;&nbsp;59</li>
+
+     <li>If <var data-x="">second</var> is not an integer, or optionally if <var
+     data-x="">second</var> is an integer:
+
+      <ol>
+
+       <li>A 002E FULL STOP character (.)</li>
+
+       <li>One, two, or three <span>ASCII digits</span>, representing the fractional part of <var
+       data-x="">second</var></li>
+
+      </ol>
+
+     </li>
+
+    </ol>
+
+   </li>
+
+  </ol>
+
+  <p class="note">The <var data-x="">second</var> component cannot be 60 or 61; leap seconds cannot
+  be represented.</p>
+
+  <div class="nodev">
+
+  <p>The rules to <dfn>parse a time string</dfn> are as follows. This will return either a time, or
+  nothing. If at any point the algorithm says that it "fails", this means that it is aborted at that
+  point and returns nothing.</p>
+
+  <ol>
+
+   <li><p>Let <var data-x="">input</var> be the string being parsed.</p></li>
+
+   <li><p>Let <var data-x="">position</var> be a pointer into <var data-x="">input</var>, initially
+   pointing at the start of the string.</p></li>
+
+   <li><p><span>Parse a time component</span> to obtain <var data-x="">hour</var>, <var
+   data-x="">minute</var>, and <var data-x="">second</var>. If this returns nothing, then fail.</p>
+
+   <li><p>If <var data-x="">position</var> is <em>not</em> beyond the end of <var
+   data-x="">input</var>, then fail.</p></li>
+
+   <li><p>Let <var data-x="">time</var> be the time with hour <var data-x="">hour</var>, minute <var
+   data-x="">minute</var>, and second <var data-x="">second</var>.</p></li>
+
+   <li><p>Return <var data-x="">time</var>.</p></li>
+
+  </ol>
+
+  <p>The rules to <dfn>parse a time component</dfn>, given an <var data-x="">input</var> string and a
+  <var data-x="">position</var>, are as follows. This will return either an hour, a minute, and a
+  second, or nothing. If at any point the algorithm says that it "fails", this means that it is
+  aborted at that point and returns nothing.</p>
+
+  <ol>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">hour</var>.</p></li>
+
+   <li>If <var data-x="">hour</var> is not a number in the range 0&nbsp;&le;&nbsp;<var
+   data-x="">hour</var>&nbsp;&le;&nbsp;23, then fail.</li>
+
+   <li><p>If <var data-x="">position</var> is beyond the end of <var data-x="">input</var> or if the
+   character at <var data-x="">position</var> is not a U+003A COLON character, then fail. Otherwise,
+   move <var data-x="">position</var> forwards one character.</p></li>
+
+   <li><p><span>Collect a sequence of characters</span> that are <span>ASCII digits</span>. If the
+   collected sequence is not exactly two characters long, then fail. Otherwise, interpret the
+   resulting sequence as a base-ten integer. Let that number be the <var
+   data-x="">minute</var>.</p></li>
+
+   <li>If <var data-x="">minute</var> is not a number in the range 0&nbsp;&le;&nbsp;<var
+   data-x="">minute</var>&nbsp;&le;&nbsp;59, then fail.</li>
+
+   <li><p>Let <var data-x="">second</var> be a string with the value "0".</p></li>
+
+   <li>
+
+    <p>If <var data-x="">position</var> is not beyond the end of <var data-x="">input</var> and the
+    character at <var data-x="">position</var> is a U+003A COLON, then run these substeps:</p>
+
+    <ol>
+
+     <li><p>Advance <var data-x="">position</var> to the next character in <var
+     data-x="">input</var>.</p></li>
+
+     <li><p>If <var data-x="">position</var> is beyond the end of <var data-x="">input</var>, or at
+     the last character in <var data-x="">input</var>, or if the next <em>two</em> characters in <var
+     data-x="">input</var> starting at <var data-x="">position</var> are not both <span>ASCII
+     digits</span>, then fail.</p></li>
+
+     <li><p><span>Collect a sequence of characters</span> that are either <span>ASCII digits</span>
+     or U+002E FULL STOP characters. If the collected sequence is three characters long, or if it is
+     longer than three characters long and the third character is not a U+002E FULL STOP character,
+     or if it has more than one U+002E FULL STOP character, then fail. Otherwise, let the collected
+     string be <var data-x="">second</var> instead of its previous value.</p></li>
+
+    </ol>
+
+   </li>
+
+   <li><p>Interpret <var data-x="">second</var> as a base-ten number (possibly with a fractional
+   part). Let <var data-x="">second</var> be that number instead of the string version.</p></li>
+
+   <li><p>If <var data-x="">second</var> is not a number in the range 0&nbsp;&le;&nbsp;<var
+   data-x="">second</var>&nbsp;&lt;&nbsp;60, then fail.</p></li>
+
+   <li><p>Return <var data-x="">hour</var>, <var data-x="">minute</var>, and <var
+   data-x="">second</var>.</p></li>
+
+  </ol>
+
+  </div>
+
+
+  <h5>Local dates and times</h5>
+
+  <p>A <dfn data-x="concept-datetime-local">local date and time</dfn> consists of a specific
+  <span>proleptic-Gregorian date</span>, consisting of a year, a month, and a day, and a time,
+  consisting of an hour, a minute, a second, and a fraction of a second, but expressed without a
+  time zone. <a href="#refsGREGORIAN">[GREGORIAN]</a></p>
+
+  <p>A string is a <dfn>valid local date and time string</dfn> representing a date and time if it
+  consists of the following components in the given order:</p>
+
+  <ol>
+
+   <li>A <span>valid date string</span> representing the date</li>
+
+   <li>A U+0054 LATIN CAPITAL LETTER T character (T) or a U+0020 SPACE character</li>
+
+   <li>A <span>valid time string</span> representing the time</li>
+
+  </ol>
+
+  <p>A string is a <dfn>valid normalised local date and time string</dfn> representing a date and
+  time if it consists of the following components in the given order:</p>
+
+  <ol>
+
+   <li>A <span>valid date string</span> representing the date</li>
+
+   <li>A U+0054 LATIN CAPITAL LETTER T character (T)</li>
+
+   <li>A <span>valid time string</span> representing the time, expressed as the shortest possible
+   string for the given time (e.g. omitting the seconds component entirely if the given time is zero
+   seconds past the minute)</li>
+
+  </ol>
+
+  <div class="nodev">
+
+  <p>The rules to <dfn>parse a local date and time string</dfn> are as follows. This will return
+  either a date and time, or nothing. If at any point the algorithm says that it "fails", this means
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/LICENSE.md b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/LICENSE.md
new file mode 100644
index 00000000000..ad4858c8745
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/LICENSE.md
@@ -0,0 +1,11 @@
+# The 3-Clause BSD License
+
+Copyright 2019 web-platform-tests contributors
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/README.md b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/README.md
new file mode 100644
index 00000000000..61b656941b5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/README.md
@@ -0,0 +1,52 @@
+This directory contains a number of tests from
+[web-platform-tests](https://github.com/web-platform-tests/wpt) at
+77585330fd7da01392aec01cf5fed7aa22597180, chosen from the files processed by the manifest script.
+
+These files are split into two directories:
+
+ * `weighted`, a set of 15 tests curated from a random weighted sample of 30, weighted by parse
+   time as of html5lib 1.0.1. The curation was performed primarily as many of the slowest files are
+   very similar and therefore provide little extra coverage while it is relatively probable both
+   with be chosen. This provides a set of files which significantly contribute to the manifest
+   generation time.
+
+ * `random`, a further set of 15 tests, this time a random unweighted sample of 15. This provides a
+   set of files much closer to the average file in WPT.
+
+The files are sourced from the following:
+
+`weighted`:
+
+ * `css/compositing/test-plan/test-plan.src.html`
+ * `css/css-flexbox/align-content-wrap-002.html`
+ * `css/css-grid/grid-definition/grid-auto-fill-rows-001.html`
+ * `css/css-grid/masonry.tentative/masonry-item-placement-006.html`
+ * `css/css-images/image-orientation/reference/image-orientation-from-image-content-images-ref.html`
+ * `css/css-position/position-sticky-table-th-bottom-ref.html`
+ * `css/css-text/white-space/pre-float-001.html`
+ * `css/css-ui/resize-004.html`
+ * `css/css-will-change/will-change-abspos-cb-001.html`
+ * `css/filter-effects/filter-turbulence-invalid-001.html`
+ * `css/vendor-imports/mozilla/mozilla-central-reftests/css21/pagination/moz-css21-table-page-break-inside-avoid-2.html`
+ * `encoding/legacy-mb-tchinese/big5/big5_chars_extra.html`
+ * `html/canvas/element/compositing/2d.composite.image.destination-over.html`
+ * `html/semantics/embedded-content/the-canvas-element/toBlob.png.html`
+ * `referrer-policy/4K-1/gen/top.http-rp/unsafe-url/fetch.http.html`
+
+`random`:
+
+ * `content-security-policy/frame-ancestors/frame-ancestors-self-allow.html`
+ * `css/css-backgrounds/reference/background-origin-007-ref.html`
+ * `css/css-fonts/idlharness.html`
+ * `css/css-position/static-position/htb-ltr-ltr.html`
+ * `css/vendor-imports/mozilla/mozilla-central-reftests/css21/pagination/moz-css21-float-page-break-inside-avoid-6.html`
+ * `css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-content-box-002.html`
+ * `encoding/legacy-mb-korean/euc-kr/euckr-encode-form.html`
+ * `html/browsers/browsing-the-web/unloading-documents/beforeunload-on-history-back-1.html`
+ * `html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/non_automated/001.html`
+ * `html/editing/dnd/overlay/heavy-styling-005.html`
+ * `html/rendering/non-replaced-elements/lists/li-type-unsupported-ref.html`
+ * `html/semantics/grouping-content/the-dl-element/grouping-dl.html`
+ * `trusted-types/worker-constructor.https.html`
+ * `webvtt/rendering/cues-with-video/processing-model/selectors/cue/background_shorthand_css_relative_url.html`
+ * `IndexedDB/idbindex_get8.htm`
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/001.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/001.html
new file mode 100644
index 00000000000..7b0f21ec046
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/001.html
@@ -0,0 +1,3 @@
+<!doctype html>
+<title>Accessing named windows from outside the unit of related browsing contexts</title>
+<a href="001-1.html" target="test_name">Click here</a>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background-origin-007-ref.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background-origin-007-ref.html
new file mode 100644
index 00000000000..d3a1d053281
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background-origin-007-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Backgrounds and Borders Reference</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<style>
+  div {
+    background-color: green;
+    height: 55px;
+    left: 5px;
+    position: relative;
+    top: 5px;
+    width: 55px;
+  }
+</style>
+<body>
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+  <div></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background_shorthand_css_relative_url.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background_shorthand_css_relative_url.html
new file mode 100644
index 00000000000..2397fec0052
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/background_shorthand_css_relative_url.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>WebVTT rendering, ::cue, background shorthand, background image URL with relative path from CSS file</title>
+<link rel="match" href="background_shorthand_css_relative_url-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+html { overflow:hidden }
+body { margin:0 }
+::cue {
+    font-family: Ahem, sans-serif;
+    background: #0f0 url('../../media/background.gif') repeat-x top left;
+    color: green;
+}
+</style>
+<script src="/common/reftest-wait.js"></script>
+<video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
+    <source src="/media/white.webm" type="video/webm">
+    <source src="/media/white.mp4" type="video/mp4">
+    <track src="../../support/test.vtt">
+    <script>
+    document.getElementsByTagName('track')[0].track.mode = 'showing';
+    </script>
+</video>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/beforeunload-on-history-back-1.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/beforeunload-on-history-back-1.html
new file mode 100644
index 00000000000..4403cfa8e91
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/beforeunload-on-history-back-1.html
@@ -0,0 +1,5 @@
+<!doctype html>
+001-1
+<script>
+addEventListener("beforeunload", function() {top.t.step(function() {top.beforeunload_fired = true})}, false);
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/euckr-encode-form.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/euckr-encode-form.html
new file mode 100644
index 00000000000..545f8ac93f6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/euckr-encode-form.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="euc-kr"> <!-- test breaks if the server overrides this -->
+<title>EUC-KR encoding (form)</title>
+<meta name="timeout" content="long">
+<meta name="variant" content="?1-1000">
+<meta name="variant" content="?1001-2000">
+<meta name="variant" content="?2001-3000">
+<meta name="variant" content="?3001-4000">
+<meta name="variant" content="?4001-5000">
+<meta name="variant" content="?5001-6000">
+<meta name="variant" content="?6001-7000">
+<meta name="variant" content="?7001-8000">
+<meta name="variant" content="?8001-9000">
+<meta name="variant" content="?9001-10000">
+<meta name="variant" content="?10001-11000">
+<meta name="variant" content="?11001-12000">
+<meta name="variant" content="?12001-13000">
+<meta name="variant" content="?13001-14000">
+<meta name="variant" content="?14001-15000">
+<meta name="variant" content="?15001-16000">
+<meta name="variant" content="?16001-17000">
+<meta name="variant" content="?17001-last">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/subset-tests.js"></script>
+<script src="euckr_index.js"></script>
+<script src="euckr-encoder.js"></script>
+<link rel="author" title="Richard Ishida" href="mailto:ishida@w3.org">
+<link rel="help" href="https://encoding.spec.whatwg.org/#euc-kr">
+<meta name="assert" content="The browser produces the expected byte sequences for all characters in the euc-kr encoding after 0x9F when encoding bytes for a URL produced by a form, using the  encoder steps in the specification.">
+<style>
+ iframe { display:none }
+ form { display:none }
+</style>
+</head>
+<body>
+<div id="log"></div>
+<script src="../../resources/ranges.js"></script>
+<script>
+var errors = false;
+var encoder = euckrEncoder;
+var ranges = rangesAll;
+var separator = ",";
+function expect(result, codepoint) {
+  return "%" + result.replace(/ /g, "%");
+}
+</script>
+<script src="../../resources/encode-form-common.js"></script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/frame-ancestors-self-allow.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/frame-ancestors-self-allow.html
new file mode 100644
index 00000000000..a8a295dfc40
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/frame-ancestors-self-allow.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="support/frame-ancestors-test.sub.js"></script>
+</head>
+<body>
+    <script>
+        test = async_test("A 'frame-ancestors' CSP directive with a value 'self' should allow rendering.");
+
+        sameOriginFrameShouldBeAllowed("'self'");
+    </script>
+</body>
+</html>
+
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/grouping-dl.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/grouping-dl.html
new file mode 100644
index 00000000000..2394d6a9298
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/grouping-dl.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>the dl element</title>
+    <link rel="author" title="dzenana" href="mailto:dzenana.trenutak@gmail.com">
+    <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-dl-element">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script>
+        "use strict";
+
+        // check that prototype matches spec's DOM interface
+        test(function () {
+            var testElement = document.createElement("dl");
+            assert_equals(Object.getPrototypeOf(testElement), HTMLDListElement.prototype, "HTMLDListElement.prototype should be used for dl");
+        }, "The prototype for dl is HTMLDListElement.prototype");
+
+        // Not checking: effects of markup on defining groups and the name-pair values within those groups
+
+    </script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates the dl element.</p>
+
+    <div id="log"></div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/heavy-styling-005.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/heavy-styling-005.html
new file mode 100644
index 00000000000..2bbdb3cf73b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/heavy-styling-005.html
@@ -0,0 +1,15 @@
+<!DOCTYPe html>
+<meta charset='utf-8'>
+<title>drag and drop – feedback overlay for heavily styled elements – 005</title>
+<style>
+a {
+  display: block;
+  height: 200px;
+  width: 200px;
+  background-color: rgba(0,0,255,0.5);
+}
+</style>
+
+<p>Drag the blue box below downwards. The drag placeholder should resemble the blue box, including the text within it.</p>
+
+<a draggable="true" ondragstart="event.dataTransfer.effectAllowed ='copy'">TEST</a>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/htb-ltr-ltr.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/htb-ltr-ltr.html
new file mode 100644
index 00000000000..5a19c0e9ccd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/htb-ltr-ltr.html
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css2/visudet.html#abs-non-replaced-width" />
+<link rel="match" href="htb-ref.html">
+<meta name="assert" content="This test checks the static position of an out of flow absolute positioned element, under various conditions." />
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+.container {
+  position: relative;
+  background: green;
+  color: green;
+  font: 16px/1 Ahem;
+  border: solid black 3px;
+  width: 400px;
+  margin: 16px 0;
+}
+.red { color: red; }
+.cb { position: relative; }
+.rtl { direction: rtl; }
+.ltr { direction: ltr; }
+.inline { display: inline; }
+.abs { position: absolute; }
+
+.indent { text-indent: 20px; }
+* { text-indent: initial; }
+</style>
+
+There should be no red.
+<div class="container ltr">
+  XXX<span class="ltr">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr indent">
+  XXX<span class="ltr">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr">
+  XXX<span class="ltr">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr indent">
+  XXX<span class="ltr">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr">
+  XXX<span class="ltr cb">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr indent">
+  XXX<span class="ltr cb">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr">
+  XXX<span class="ltr cb">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr indent">
+  XXX<span class="ltr cb">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span>
+</div>
+
+<div class="container ltr">
+  <span class="cb">XXX<span class="ltr">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span></span>
+</div>
+
+<div class="container ltr indent">
+  <span class="cb">XXX<span class="ltr">XX<div class="abs inline">XXXXX</div><span class="red">XXXXX</span></span></span>
+</div>
+
+<div class="container ltr">
+  <span class="cb">XXX<span class="ltr">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span></span>
+</div>
+
+<div class="container ltr indent">
+  <span class="cb">XXX<span class="ltr">XX<div class="abs block">XXXXX</div><br><span class="red">XXXXX</span></span></span>
+</div>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idbindex_get8.htm b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idbindex_get8.htm
new file mode 100644
index 00000000000..9bfc48422fe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idbindex_get8.htm
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>IDBIndex.get() - throw InvalidStateError on index deleted by aborted upgrade</title>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#dom-idb">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=support.js></script>
+<div id="log"></div>
+<script>
+    var db,
+        t = async_test();
+
+    var open_rq = createdb(t);
+    open_rq.onupgradeneeded = function(e) {
+        db = e.target.result;
+        var store = db.createObjectStore("store", { keyPath: "key" });
+        var index = store.createIndex("index", "indexedProperty");
+        store.add({ key: 1, indexedProperty: "data" });
+
+        e.target.transaction.abort();
+
+        assert_throws_dom("InvalidStateError", function(){
+            index.get("data");
+        });
+        t.done();
+    }
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idlharness.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idlharness.html
new file mode 100644
index 00000000000..ecc601bcf6a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/idlharness.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<title>CSS Fonts IDL tests</title>
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+
+<style>
+  div { display: block; }
+</style>
+<style>
+  @font-face {
+    font-family: fwf;
+    src: url(support/fonts/FontWithFancyFeatures.otf);
+  }
+</style>
+
+<script>
+  "use strict";
+
+  idl_test(
+    ["css-fonts"],
+    ["cssom"],
+    idl_array => {
+      idl_array.add_objects({
+        CSSRule: ['cssRule'],
+        CSSFontFaceRule: ['cssFontFaceRule'],
+      });
+      self.cssRule = document.styleSheets[0].cssRules[0];
+      self.cssFontFaceRule = document.styleSheets[1].cssRules[0];
+    }
+  );
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/li-type-unsupported-ref.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/li-type-unsupported-ref.html
new file mode 100644
index 00000000000..4fbc5aca974
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/li-type-unsupported-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>li@type: unsupported types</title>
+<li>first item</li>
+<li>second item</li>
+<ol>
+  <li>first ordered item</li>
+  <li>second ordered item</li>
+</ol>
+<ul>
+  <li>first unordered item</li>
+  <li>second unordered item</li>
+</ul>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/moz-css21-float-page-break-inside-avoid-6.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/moz-css21-float-page-break-inside-avoid-6.html
new file mode 100644
index 00000000000..3cd0a5fb1c4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/moz-css21-float-page-break-inside-avoid-6.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en-US" class="reftest-paged">
+<head>
+  <title>CSS Test: CSS 2.1 page-break-inside:avoid</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=685012">
+  <link rel="help" href="http://www.w3.org/TR/CSS21/page.html#propdef-page-break-inside">
+  <link rel="match" href="moz-css21-float-page-break-inside-avoid-6-ref.html">
+  <meta name="flags" content="paged">
+<style type="text/css">
+@page { size:5in 3in; margin:0.5in; }
+html,body {
+    color:black; background-color:white; font-size:16px; padding:0; margin:0; height:100%;
+}
+p { height:60%; width:90%; margin:0; background-color:blue; border:1px solid black; }
+.test { page-break-inside:avoid; float:left; }
+</style>
+</head>
+<body><p>1</p><p class="test">2</p></body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/shape-outside-content-box-002.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/shape-outside-content-box-002.html
new file mode 100644
index 00000000000..e2040763dfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/shape-outside-content-box-002.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+  <title>CSS Shape Test: float right, content-box</title>
+  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#shapes-from-box-values">
+  <link rel="match" href="shape-outside-content-box-002-ref.html">
+  <meta name="flags" content="">
+  <meta name="assert" content="Test the boxes are wrapping around the right float shape defined by the content-box value.">
+  <style>
+  .container {
+    direction: rtl;
+    width: 175px;
+    line-height: 0;
+  }
+
+  .shape {
+    float: right;
+    shape-outside: content-box;
+    box-sizing: content-box;
+    height: 25px;
+    width: 25px;
+    padding: 25px;
+    border: 25px solid lightgreen;
+    margin: 25px;
+    background-color: orange;
+  }
+
+  .box {
+    display: inline-block;
+    width: 50px;
+    height: 25px;
+    background-color: blue;
+  }
+
+  .longbox {
+    display: inline-block;
+    width: 175px;
+    height: 25px;
+    background-color: blue;
+  }
+  </style>
+
+  <main class="container">
+    <div class="shape"></div>
+    <div class="shape"></div>
+    <div class="longbox"></div> <!-- Saturate the margin space -->
+    <div class="longbox"></div> <!-- Saturate the border space -->
+    <div class="longbox"></div> <!-- Saturate the padding space -->
+    <div class="box"></div>
+    <div class="longbox"></div> <!-- Saturate the padding space -->
+    <div class="longbox"></div> <!-- Saturate the border space -->
+    <div class="longbox"></div> <!-- Saturate the margin space -->
+
+    <div class="longbox"></div> <!-- Saturate the margin space -->
+    <div class="longbox"></div> <!-- Saturate the border space -->
+    <div class="longbox"></div> <!-- Saturate the padding space -->
+    <div class="box"></div>
+    <div class="longbox"></div> <!-- Saturate the padding space -->
+    <div class="longbox"></div> <!-- Saturate the border space -->
+    <div class="longbox"></div> <!-- Saturate the margin space -->
+  </main>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/worker-constructor.https.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/worker-constructor.https.html
new file mode 100644
index 00000000000..6e127b11a5b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/random/worker-constructor.https.html
@@ -0,0 +1,86 @@
+<!doctype html>
+<html>
+<head>
+  <meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+
+const test_url = "support/WorkerGlobalScope-importScripts.https.js"
+const trusted_url = trustedTypes.createPolicy("anythinggoes", {
+  createScriptURL: x => x}).createScriptURL(test_url);
+const default_url = "support/WorkerGlobalScope-importScripts.potato.js"
+
+async function service_worker(url) {
+  if (!('serviceWorker' in navigator)) return Promise.resolve();
+
+  const scope = 'support/some/scope/for/this/test';
+  const reg = await navigator.serviceWorker.getRegistration(scope);
+  if (reg) await reg.unregister();
+  return await navigator.serviceWorker.register(url, {scope});
+}
+
+// Most tests below don't need promises, but the ones related to
+// ServiceWorkers do. Since we can't mix promise and non-promise tests,
+// we'll just run the non-promise tests in the main function and return
+// an empty-resolved promise for those.
+// Since an active default policy will affect all subsequent DOM operations,
+// we're wrapping policy creation in a promise_test. Together, this will
+// force proper serialization of all tests.
+//
+// Generally, we don't actually care what the workers here do, we'll merely
+// check whether creation succeeds.
+
+promise_test(t => {
+  new Worker(trusted_url);
+  return Promise.resolve();
+}, "Create Worker via ScriptTestUrl");
+
+promise_test(t => {
+  new SharedWorker(trusted_url);
+  return Promise.resolve();
+}, "Create SharedWorker via ScriptTestUrl");
+
+promise_test(t => {
+  return service_worker(trusted_url);
+}, "Create ServiceWorker via ScriptTestUrl");
+
+promise_test(t => {
+  assert_throws_js(TypeError, () => new Worker(test_url));
+  return Promise.resolve();
+}, "Block Worker creation via string");
+
+promise_test(t => {
+  assert_throws_js(TypeError, () => new SharedWorker(test_url));
+  return Promise.resolve();
+}, "Block SharedWorker creation via string");
+
+promise_test(t => {
+  return promise_rejects_js(t, TypeError, service_worker(test_url));
+}, "Block ServiceWorker creation via String");
+
+// Tests with default policy.
+promise_test(t => {
+  trustedTypes.createPolicy("default", {
+      createScriptURL: s => s.replace("potato", "https") });
+  return Promise.resolve();
+}, "Setup default policy.");
+
+promise_test(t => {
+  new Worker(default_url);
+  return Promise.resolve();
+}, "Create Worker via string with default policy.");
+
+promise_test(t => {
+  new SharedWorker(default_url);
+  return Promise.resolve();
+}, "Create SharedWorker via string with default policy.");
+
+promise_test(t => {
+  return service_worker(default_url);
+}, "Create ServiceWorker via string with default policy.");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/2d.composite.image.destination-over.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/2d.composite.image.destination-over.html
new file mode 100644
index 00000000000..d742f84dfb8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/2d.composite.image.destination-over.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.composite.image.destination-over</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.composite.image.destination-over</h1>
+<p class="desc"></p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+<p class="output expectedtext">Expected output:<p><img src="2d.composite.image.destination-over.png" class="output expected" id="expected" alt="">
+<ul id="d"></ul>
+<script>
+var t = async_test("");
+_addTest(function(canvas, ctx) {
+
+
+ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
+ctx.fillRect(0, 0, 100, 50);
+ctx.globalCompositeOperation = 'destination-over';
+ctx.drawImage(document.getElementById('yellow75.png'), 0, 0);
+_assertPixelApprox(canvas, 50,25, 109,255,146,223, "50,25", "109,255,146,223", 5);
+
+
+});
+</script>
+<img src="/images/yellow75.png" id="yellow75.png" class="resource">
+
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/align-content-wrap-002.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/align-content-wrap-002.html
new file mode 100644
index 00000000000..a15f7ea844d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/align-content-wrap-002.html
@@ -0,0 +1,108 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#propdef-align-content" />
+<title>css-flexbox: Tests align-content with flex-wrap: wrap</title>
+<style>
+.flex-horizontal {
+    width:600px;
+    display:flex;
+    height:100px;
+    background:gray;
+    margin-bottom:100px;
+}
+.flex-vertical {
+    width:100px;
+    display:flex;
+    flex-direction: column;
+    height:600px;
+    background:gray;
+    margin-top:200px;
+    margin-bottom:100px;
+}
+.item-horizontal {
+    width:150px;
+    background:yellow;
+    margin:10px;
+    flex:none;
+}
+.item-vertical {
+    height:150px;
+    background:yellow;
+    margin:10px;
+    flex:none;
+}
+.content1-horizontal {
+    width:100px;
+    height:150px;
+    background:red;
+}
+.content2-horizontal {
+    width:100px;
+    height:100px;
+    background:red;
+}
+.content3-horizontal {
+    width:100px;
+    height:50px;
+    background:red;
+}
+.content1-vertical {
+    width:150px;
+    height:100px;
+    background:red;
+}
+.content2-vertical {
+    width:100px;
+    height:100px;
+    background:red;
+}
+.content3-vertical {
+    width:50px;
+    height:100px;
+    background:red;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.flex-horizontal, .flex-vertical');">
+<div id=log></div>
+<p>Test for crbug.com/362848: Flex box word-wrap is not adhering to spec</p>
+<div class="flex-horizontal">
+    <div class="item-horizontal" data-expected-height="80"><div class="content1-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="80"><div class="content2-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="80"><div class="content3-horizontal"></div></div>
+</div>
+
+<div class="flex-horizontal" style="flex-wrap:wrap;">
+    <div class="item-horizontal" data-expected-height="150"><div class="content1-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content2-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content3-horizontal"></div></div>
+</div>
+
+<div class="flex-horizontal" style="flex-wrap:wrap;">
+    <div class="item-horizontal" data-expected-height="150"><div class="content1-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content2-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content3-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content1-horizontal"></div></div>
+    <div class="item-horizontal" data-expected-height="150"><div class="content2-horizontal"></div></div>
+</div>
+
+<div class="flex-vertical">
+    <div class="item-vertical" data-expected-width="80"><div class="content1-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="80"><div class="content2-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="80"><div class="content3-vertical"></div></div>
+</div>
+
+<div class="flex-vertical" style="flex-wrap:wrap;">
+    <div class="item-vertical" data-expected-width="150"><div class="content1-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content2-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content3-vertical"></div></div>
+</div>
+
+<div class="flex-vertical" style="flex-wrap:wrap;">
+    <div class="item-vertical" data-expected-width="150"><div class="content1-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content2-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content3-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content1-vertical"></div></div>
+    <div class="item-vertical" data-expected-width="150"><div class="content2-vertical"></div></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/big5_chars_extra.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/big5_chars_extra.html
new file mode 100644
index 00000000000..5ea8e5740da
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/big5_chars_extra.html
@@ -0,0 +1 @@
+<!doctype html><html><head><meta charset="big5"><title>big5 characters</title></head><body><span data-cp="C0" data-bytes="88 59">�Y</span> <span data-cp="C1" data-bytes="88 57">�W</span> <span data-cp="C8" data-bytes="88 5D">�]</span> <span data-cp="C9" data-bytes="88 5B">�[</span> <span data-cp="CA" data-bytes="88 66">�f</span> <span data-cp="D2" data-bytes="88 61">�a</span> <span data-cp="D3" data-bytes="88 5F">�_</span> <span data-cp="E0" data-bytes="88 6A">�j</span> <span data-cp="E1" data-bytes="88 68">�h</span> <span data-cp="E8" data-bytes="88 6F">�o</span> <span data-cp="E9" data-bytes="88 6D">�m</span> <span data-cp="EA" data-bytes="88 A7">�§</span> <span data-cp="EC" data-bytes="88 73">�s</span> <span data-cp="ED" data-bytes="88 71">�q</span> <span data-cp="F2" data-bytes="88 77">�w</span> <span data-cp="F3" data-bytes="88 75">�u</span> <span data-cp="F9" data-bytes="88 7B">�{</span> <span data-cp="FA" data-bytes="88 79">�y</span> <span data-cp="FC" data-bytes="88 A2">�˘</span> <span data-cp="100" data-bytes="88 56">�V</span> <span data-cp="101" data-bytes="88 67">�g</span> <span data-cp="112" data-bytes="88 5A">�Z</span> <span data-cp="113" data-bytes="88 6C">�l</span> <span data-cp="11A" data-bytes="88 5C">�\</span> <span data-cp="11B" data-bytes="88 6E">�n</span> <span data-cp="12B" data-bytes="88 70">�p</span> <span data-cp="14C" data-bytes="88 5E">�^</span> <span data-cp="14D" data-bytes="88 74">�t</span> <span data-cp="16B" data-bytes="88 78">�x</span> <span data-cp="1CD" data-bytes="88 58">�X</span> <span data-cp="1CE" data-bytes="88 69">�i</span> <span data-cp="1D0" data-bytes="88 72">�r</span> <span data-cp="1D1" data-bytes="88 60">�`</span> <span data-cp="1D2" data-bytes="88 76">�v</span> <span data-cp="1D4" data-bytes="88 7A">�z</span> <span data-cp="1D6" data-bytes="88 7C">�|</span> <span data-cp="1D8" data-bytes="88 7D">�}</span> <span data-cp="1DA" data-bytes="88 7E">�~</span> <span data-cp="1DC" data-bytes="88 A1">�ˇ</span> <span data-cp="251" data-bytes="88 6B">�k</span> <span data-cp="261" data-bytes="88 A8">�¨</span> <span data-cp="1EBE" data-bytes="88 63">�c</span> <span data-cp="1EBF" data-bytes="88 A4">�¤</span> <span data-cp="1EC0" data-bytes="88 65">�e</span> <span data-cp="1EC1" data-bytes="88 A6">�¦</span> <span data-cp="23DA" data-bytes="88 A9">�©</span> <span data-cp="23DB" data-bytes="88 AA">�Ş</span> <span data-cp="31C0" data-bytes="88 40">�@</span> <span data-cp="31C1" data-bytes="88 41">�A</span> <span data-cp="31C2" data-bytes="88 42">�B</span> <span data-cp="31C3" data-bytes="88 43">�C</span> <span data-cp="31C4" data-bytes="88 44">�D</span> <span data-cp="31C5" data-bytes="88 46">�F</span> <span data-cp="31C6" data-bytes="88 49">�I</span> <span data-cp="31C7" data-bytes="88 4A">�J</span> <span data-cp="31C8" data-bytes="88 4D">�M</span> <span data-cp="31C9" data-bytes="88 4F">�O</span> <span data-cp="31CA" data-bytes="88 50">�P</span> <span data-cp="31CB" data-bytes="88 51">�Q</span> <span data-cp="31CC" data-bytes="88 52">�R</span> <span data-cp="31CD" data-bytes="88 54">�T</span> <span data-cp="31CE" data-bytes="88 55">�U</span> <span data-cp="3435" data-bytes="92 77">’w</span> <span data-cp="3440" data-bytes="96 DF">–ß</span> <span data-cp="344A" data-bytes="8C F4">Śô</span> <span data-cp="344C" data-bytes="89 D5">‰Ő</span> <span data-cp="3464" data-bytes="93 CD">“Í</span> <span data-cp="3473" data-bytes="9B DF">›ß</span> <span data-cp="347D" data-bytes="89 DA">‰Ú</span> <span data-cp="347E" data-bytes="8F 59">ŹY</span> <span data-cp="3493" data-bytes="89 DB">‰Ű</span> <span data-cp="3496" data-bytes="8F 5D">Ź]</span> <span data-cp="34A5" data-bytes="89 DC">‰Ü</span> <span data-cp="34AF" data-bytes="96 F7">–÷</span> <span data-cp="34BC" data-bytes="8A DA">ŠÚ</span> <span data-cp="34C1" data-bytes="8B DC">‹Ü</span> <span data-cp="34C8" data-bytes="97 DB">—Ű</span> <span data-cp="34DF" data-bytes="9E 53">žS</span> <span data-cp="34E4" data-bytes="9D AA">ťŞ</span> <span data-cp="34E6" data-bytes="87 BE">‡ľ</span> <span data-cp="34FB" data-bytes="9B EA">›ę</span> <span data-cp="3506" data-bytes="8A 6E">Šn</span> <span data-cp="353E" data-bytes="8B C8">‹Č</span> <span data-cp="3551" data-bytes="89 E8">‰č</span> <span data-cp="3553" data-bytes="89 EA">‰ę</span> <span data-cp="3559" data-bytes="8C 4B">ŚK</span> <span data-cp="356D" data-bytes="89 ED">‰í</span> <span data-cp="3570" data-bytes="94 DD">”Ý</span> <span data-cp="3572" data-bytes="89 EE">‰î</span> <span data-cp="3577" data-bytes="9E B4">ž´</span> <span data-cp="3578" data-bytes="8A D3">ŠÓ</span> <span data-cp="3584" data-bytes="92 DB">’Ű</span> <span data-cp="3597" data-bytes="94 DB">”Ű</span> <span data-cp="3598" data-bytes="89 F9">‰ů</span> <span data-cp="35A5" data-bytes="89 FB">‰ű</span> <span data-cp="35AD" data-bytes="9E FC">žü</span> <span data-cp="35BF" data-bytes="89 FC">‰ü</span> <span data-cp="35C1" data-bytes="89 BF">‰ż</span> <span data-cp="35C5" data-bytes="89 FE">‰ţ</span> <span data-cp="35C7" data-bytes="89 E6">‰ć</span> <span data-cp="35CA" data-bytes="9D 46">ťF</span> <span data-cp="35CE" data-bytes="9D EE">ťî</span> <span data-cp="35D2" data-bytes="A0 7E"> ~</span> <span data-cp="35D6" data-bytes="A0 68"> h</span> <span data-cp="35DB" data-bytes="98 E9">�é</span> <span data-cp="35DD" data-bytes="8B 68">‹h</span> <span data-cp="35F1" data-bytes="8D FD">Ťý</span> <span data-cp="35F2" data-bytes="8B BE">‹ľ</span> <span data-cp="35F3" data-bytes="9F D9">źŮ</span> <span data-cp="35FB" data-bytes="8A EB">Šë</span> <span data-cp="35FE" data-bytes="9F D7">ź×</span> <span data-cp="3609" data-bytes="8B 6A">‹j</span> <span data-cp="3618" data-bytes="9C 5C">ś\</span> <span data-cp="361A" data-bytes="8B B1">‹±</span> <span data-cp="3625" data-bytes="87 70">‡p</span> <span data-cp="362D" data-bytes="9D F3">ťó</span> <span data-cp="3635" data-bytes="A0 D0"> Đ</span> <span data-cp="363E" data-bytes="92 E9">’é</span> <span data-cp="3647" data-bytes="9A EC">šě</span> <span 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data-cp="36D6" data-bytes="97 E7">—ç</span> <span data-cp="36DD" data-bytes="93 59">“Y</span> <span data-cp="36E1" data-bytes="91 F5">‘ő</span> <span data-cp="36E2" data-bytes="97 B8">—¸</span> <span data-cp="36F5" data-bytes="92 FA">’ú</span> <span data-cp="3701" data-bytes="93 57">“W</span> <span data-cp="3703" data-bytes="8B A6">‹¦</span> <span data-cp="370A" data-bytes="97 B0">—°</span> <span data-cp="371C" data-bytes="9C A1">śˇ</span> <span data-cp="3722" data-bytes="91 F2">‘ň</span> <span data-cp="3723" data-bytes="91 F9">‘ů</span> <span data-cp="3725" data-bytes="8F F1">Źń</span> <span data-cp="372C" data-bytes="97 45">—E</span> <span data-cp="372D" data-bytes="98 53">�S</span> <span data-cp="3733" data-bytes="92 51">’Q</span> <span data-cp="373A" data-bytes="9D AD">ť­</span> <span data-cp="3762" data-bytes="9B C2">›Â</span> <span data-cp="376F" data-bytes="9A 7B">š{</span> <span data-cp="3797" data-bytes="8B 60">‹`</span> <span data-cp="37A0" data-bytes="93 4B">“K</span> <span data-cp="37B9" data-bytes="9A BD">š˝</span> <span data-cp="37BE" data-bytes="91 B7">‘·</span> <span data-cp="37D6" data-bytes="8D 4B">ŤK</span> <span data-cp="37F2" data-bytes="95 B4">•´</span> <span data-cp="37FB" data-bytes="9E F0">žđ</span> <span data-cp="380F" data-bytes="8D 64">Ťd</span> <span data-cp="3819" data-bytes="92 69">’i</span> <span data-cp="3820" data-bytes="8D 67">Ťg</span> <span data-cp="3838" data-bytes="8D 68">Ťh</span> <span data-cp="3863" data-bytes="93 EB">“ë</span> <span data-cp="3875" data-bytes="87 7A">‡z</span> <span data-cp="38C3" data-bytes="91 66">‘f</span> <span data-cp="38D1" data-bytes="93 DD">“Ý</span> <span data-cp="38D4" data-bytes="8D 52">ŤR</span> <span data-cp="38FA" data-bytes="8B CC">‹Ě</span> <span data-cp="3908" data-bytes="8D 6D">Ťm</span> <span data-cp="3914" data-bytes="8D 6E">Ťn</span> <span data-cp="3927" data-bytes="96 A8">–¨</span> <span data-cp="393F" data-bytes="8D 6F">Ťo</span> <span data-cp="394D" data-bytes="8D 70">Ťp</span> <span data-cp="3978" data-bytes="8C F3">Śó</span> <span data-cp="3980" data-bytes="90 60">�`</span> <span data-cp="3989" data-bytes="8D 74">Ťt</span> <span data-cp="398A" data-bytes="97 C3">—Ă</span> <span data-cp="3992" data-bytes="8A D0">ŠĐ</span> <span data-cp="3999" data-bytes="92 74">’t</span> <span data-cp="399B" data-bytes="9B BE">›ľ</span> <span data-cp="39A1" data-bytes="9C C8">śČ</span> <span data-cp="39A4" data-bytes="9C BA">śş</span> <span data-cp="39B8" data-bytes="8D 78">Ťx</span> <span data-cp="39DC" data-bytes="9E B9">žą</span> <span data-cp="39E2" data-bytes="95 5A">•Z</span> <span data-cp="39E5" data-bytes="91 B4">‘´</span> <span data-cp="39EC" data-bytes="8A 48">ŠH</span> <span data-cp="39F8" data-bytes="8D 7D">Ť}</span> <span data-cp="39FB" data-bytes="8A 7D">Š}</span> <span data-cp="39FE" data-bytes="8A C2">ŠÂ</span> <span data-cp="3A03" data-bytes="8D A1">Ťˇ</span> <span data-cp="3A06" data-bytes="8A D1">ŠŃ</span> <span data-cp="3A18" data-bytes="8B 47">‹G</span> <span 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data-cp="3C54" data-bytes="9C A5">śĄ</span> <span data-cp="3C8B" data-bytes="8C 56">ŚV</span> <span data-cp="3CCB" data-bytes="8D D6">ŤÖ</span> <span data-cp="3CCD" data-bytes="97 C0">—Ŕ</span> <span data-cp="3CD1" data-bytes="A0 DE"> Ţ</span> <span data-cp="3CD6" data-bytes="97 D2">—Ň</span> <span data-cp="3CEF" data-bytes="8D DB">ŤŰ</span> <span data-cp="3D12" data-bytes="8C EA">Śę</span> <span data-cp="3D13" data-bytes="8E AF">ŽŻ</span> <span data-cp="3D1D" data-bytes="91 B5">‘µ</span> <span data-cp="3D46" data-bytes="8D EB">Ťë</span> <span data-cp="3D4C" data-bytes="97 C6">—Ć</span> <span data-cp="3D51" data-bytes="90 FC">�ü</span> <span data-cp="3D62" data-bytes="96 D6">–Ö</span> <span data-cp="3D69" data-bytes="97 C5">—Ĺ</span> <span data-cp="3D6A" data-bytes="8D EF">Ťď</span> <span data-cp="3D6F" data-bytes="97 D7">—×</span> <span data-cp="3D75" data-bytes="8D F0">Ťđ</span> <span data-cp="3D7D" data-bytes="96 A6">–¦</span> <span data-cp="3D88" data-bytes="8C DF">Śß</span> <span data-cp="3D8A" data-bytes="8D F3">Ťó</span> <span data-cp="3D8F" data-bytes="94 49">”I</span> <span data-cp="3D91" data-bytes="8D F5">Ťő</span> <span data-cp="3DA5" data-bytes="98 72">�r</span> <span data-cp="3DAD" data-bytes="8E 6B">Žk</span> <span data-cp="3DBF" data-bytes="8F 50">ŹP</span> <span data-cp="3DC6" data-bytes="9D CC">ťĚ</span> <span data-cp="3DC9" data-bytes="8C 44">ŚD</span> <span data-cp="3DCC" data-bytes="99 6E">™n</span> <span data-cp="3DCD" data-bytes="94 A1">”ˇ</span> <span data-cp="3DD3" data-bytes="8F 63">Źc</span> <span data-cp="3DDB" data-bytes="A0 DA"> Ú</span> <span data-cp="3DE7" data-bytes="92 53">’S</span> <span data-cp="3DEB" data-bytes="9D B5">ťµ</span> <span data-cp="3DF3" data-bytes="98 79">�y</span> <span data-cp="3DF4" data-bytes="87 6A">‡j</span> <span data-cp="3DF7" data-bytes="9D 5D">ť]</span> <span data-cp="3DFC" data-bytes="8D 63">Ťc</span> <span data-cp="3DFD" data-bytes="96 69">–i</span> <span data-cp="3E06" data-bytes="9F 70">źp</span> <span 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data-cp="5ECD" data-bytes="93 53">“S</span> <span data-cp="5ED0" data-bytes="9D FB">ťű</span> <span data-cp="5EF8" data-bytes="90 59">�Y</span> <span data-cp="5F0C" data-bytes="93 61">“a</span> <span data-cp="5F0E" data-bytes="93 62">“b</span> <span data-cp="5F25" data-bytes="8D 6B">Ťk</span> <span data-cp="5F3B" data-bytes="8C FE">Śţ</span> <span data-cp="5F4D" data-bytes="95 B8">•¸</span> <span data-cp="5F51" data-bytes="8B CA">‹Ę</span> <span data-cp="5F5C" data-bytes="98 7A">�z</span> <span data-cp="5F83" data-bytes="8D 6C">Ťl</span> <span data-cp="5FB1" data-bytes="9B 70">›p</span> <span data-cp="5FBA" data-bytes="A0 51"> Q</span> <span data-cp="5FC2" data-bytes="8C 7C">Ś|</span> <span data-cp="5FC4" data-bytes="8B CB">‹Ë</span> <span data-cp="5FDB" data-bytes="93 6E">“n</span> <span data-cp="603B" data-bytes="89 66">‰f</span> <span data-cp="6062" data-bytes="9E A9">ž©</span> <span data-cp="6075" data-bytes="93 7A">“z</span> <span data-cp="6077" data-bytes="A0 E0"> ŕ</span> <span data-cp="607E" data-bytes="93 6B">“k</span> <span data-cp="60A4" data-bytes="A0 DC"> Ü</span> <span data-cp="60A7" data-bytes="94 68">”h</span> <span data-cp="60D7" data-bytes="8D 71">Ťq</span> <span data-cp="60DE" data-bytes="9B EC">›ě</span> <span data-cp="60E3" data-bytes="99 BA">™ş</span> <span data-cp="60E7" data-bytes="9A D0">šĐ</span> <span data-cp="60E8" data-bytes="9A 61">ša</span> <span data-cp="60E9" data-bytes="A0 E5"> ĺ</span> <span data-cp="60FD" data-bytes="A0 5B"> [</span> <span data-cp="6107" data-bytes="96 AC">–¬</span> <span data-cp="610C" data-bytes="97 40">—@</span> <span data-cp="6119" data-bytes="9E F1">žń</span> <span data-cp="6122" data-bytes="8C 4D">ŚM</span> <span data-cp="6130" data-bytes="9F 7E">ź~</span> <span data-cp="613D" data-bytes="8D 72">Ťr</span> <span data-cp="6150" data-bytes="96 A9">–©</span> <span data-cp="6159" data-bytes="A0 6E"> n</span> <span data-cp="616F" data-bytes="A0 74"> t</span> <span data-cp="617D" data-bytes="A0 71"> q</span> <span 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data-cp="62A6" data-bytes="A0 75"> u</span> <span data-cp="62C1" data-bytes="87 DD">‡Ý</span> <span data-cp="62C3" data-bytes="9B 46">›F</span> <span data-cp="62CE" data-bytes="A0 77"> w</span> <span data-cp="62D0" data-bytes="9D C4">ťÄ</span> <span data-cp="62E5" data-bytes="8D 7B">Ť{</span> <span data-cp="6318" data-bytes="8D 7C">Ť|</span> <span data-cp="632E" data-bytes="9E D6">žÖ</span> <span data-cp="6331" data-bytes="93 AC">“¬</span> <span data-cp="6335" data-bytes="9F 5B">ź[</span> <span data-cp="6337" data-bytes="93 A9">“©</span> <span data-cp="6364" data-bytes="A0 7C"> |</span> <span data-cp="6379" data-bytes="8A C1">ŠÁ</span> <span data-cp="637F" data-bytes="9F B4">ź´</span> <span data-cp="63B9" data-bytes="9E 4C">žL</span> <span data-cp="63C1" data-bytes="8F C5">ŹĹ</span> <span data-cp="63D1" data-bytes="93 AD">“­</span> <span data-cp="63DE" data-bytes="9D C3">ťĂ</span> <span data-cp="63E2" data-bytes="8D A2">Ť˘</span> <span data-cp="63E6" data-bytes="9D 4A">ťJ</span> <span data-cp="63FB" data-bytes="8D A3">ŤŁ</span> <span data-cp="63FC" data-bytes="9E 4B">žK</span> <span data-cp="63FE" data-bytes="9E 4D">žM</span> <span data-cp="6407" data-bytes="8D A4">Ť¤</span> <span data-cp="6432" data-bytes="8A FD">Šý</span> <span data-cp="643B" data-bytes="93 B2">“˛</span> <span data-cp="645A" data-bytes="8D A5">ŤĄ</span> <span data-cp="6471" data-bytes="93 A1">“ˇ</span> <span data-cp="647C" data-bytes="8A C6">ŠĆ</span> <span data-cp="648D" data-bytes="8A 5B">Š[</span> <span data-cp="6491" data-bytes="89 4D">‰M</span> <span data-cp="64B4" data-bytes="8A 78">Šx</span> <span data-cp="64B6" data-bytes="93 AB">“«</span> <span data-cp="64C0" data-bytes="8D A7">Ť§</span> <span data-cp="64D3" data-bytes="9F 45">źE</span> <span data-cp="64DD" data-bytes="8A 56">ŠV</span> <span data-cp="64E7" data-bytes="8E E6">Žć</span> <span data-cp="64EA" data-bytes="8A A4">Š¤</span> <span data-cp="650A" data-bytes="89 43">‰C</span> <span data-cp="6511" data-bytes="93 F3">“ó</span> <span 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data-cp="6692" data-bytes="8D B1">Ť±</span> <span data-cp="669A" data-bytes="98 59">�Y</span> <span data-cp="66B6" data-bytes="9C BF">śż</span> <span data-cp="66BF" data-bytes="9B 72">›r</span> <span data-cp="66CE" data-bytes="93 BE">“ľ</span> <span data-cp="66E7" data-bytes="8C DB">ŚŰ</span> <span data-cp="66F1" data-bytes="9D F1">ťń</span> <span data-cp="670C" data-bytes="A0 BB"> »</span> <span data-cp="670E" data-bytes="9B 7E">›~</span> <span data-cp="6716" data-bytes="8D B3">Ťł</span> <span data-cp="6719" data-bytes="8C 52">ŚR</span> <span data-cp="671E" data-bytes="9A E8">šč</span> <span data-cp="6725" data-bytes="8E DC">ŽÜ</span> <span data-cp="6736" data-bytes="9C F9">śů</span> <span data-cp="6761" data-bytes="98 E7">�ç</span> <span data-cp="676B" data-bytes="8C CA">ŚĘ</span> <span data-cp="676E" data-bytes="87 75">‡u</span> <span data-cp="6782" data-bytes="87 BA">‡ş</span> <span data-cp="678F" data-bytes="93 E5">“ĺ</span> <span data-cp="67A0" data-bytes="9A 59">šY</span> <span data-cp="67A4" data-bytes="8D B5">Ťµ</span> <span data-cp="67BF" data-bytes="8F 7D">Ź}</span> <span data-cp="67D6" data-bytes="95 47">•G</span> <span data-cp="67F9" data-bytes="92 50">’P</span> <span data-cp="67FE" data-bytes="89 68">‰h</span> <span data-cp="6800" data-bytes="8D B6">Ť¶</span> <span data-cp="6802" data-bytes="A0 7D"> }</span> <span data-cp="6803" data-bytes="98 FC">�ü</span> <span data-cp="6804" data-bytes="89 69">‰i</span> <span data-cp="6810" data-bytes="92 56">’V</span> <span data-cp="681E" data-bytes="93 E8">“č</span> <span data-cp="6836" data-bytes="9C E3">śă</span> <span data-cp="6847" data-bytes="96 40">–@</span> <span data-cp="684A" data-bytes="8D B8">Ť¸</span> <span data-cp="6855" data-bytes="9B 4A">›J</span> <span data-cp="6856" data-bytes="8F B9">Źą</span> <span data-cp="6865" data-bytes="89 6A">‰j</span> <span data-cp="6884" data-bytes="8D B9">Ťą</span> <span data-cp="6888" data-bytes="91 7E">‘~</span> <span data-cp="6898" data-bytes="93 F4">“ô</span> <span data-cp="68B6" data-bytes="93 E7">“ç</span> <span data-cp="68B9" data-bytes="97 EF">—ď</span> <span data-cp="68C5" data-bytes="96 A5">–Ą</span> <span data-cp="6909" data-bytes="8D BD">Ť˝</span> <span data-cp="6918" data-bytes="9B A1">›ˇ</span> <span data-cp="6919" data-bytes="8C A2">Ś˘</span> <span data-cp="691A" data-bytes="9A B7">š·</span> <span data-cp="691B" data-bytes="8E FC">Žü</span> <span data-cp="692C" data-bytes="9F A1">źˇ</span> <span data-cp="6943" data-bytes="8D BE">Ťľ</span> <span data-cp="6946" data-bytes="89 A4">‰¤</span> <span data-cp="6955" data-bytes="9A D9">šŮ</span> <span data-cp="6964" data-bytes="8D C0">ŤŔ</span> <span data-cp="6967" data-bytes="97 F0">—đ</span> <span data-cp="6972" data-bytes="93 B4">“´</span> <span data-cp="6980" data-bytes="9F A7">ź§</span> <span data-cp="6985" data-bytes="8D C2">ŤÂ</span> <span data-cp="698A" data-bytes="99 B6">™¶</span> <span data-cp="699F" data-bytes="8D C1">ŤÁ</span> <span data-cp="69A2" data-bytes="8E 46">ŽF</span> <span data-cp="69B2" data-bytes="A0 D1"> Ń</span> <span data-cp="69C0" data-bytes="9F CA">źĘ</span> <span data-cp="69D1" data-bytes="92 CF">’Ď</span> <span data-cp="69D5" data-bytes="9C F4">śô</span> <span data-cp="69D6" data-bytes="8D C4">ŤÄ</span> <span data-cp="69E9" data-bytes="9B 4C">›L</span> <span data-cp="6A03" data-bytes="9C DE">śŢ</span> <span data-cp="6A0C" data-bytes="98 6C">�l</span> <span data-cp="6A1A" data-bytes="97 F9">—ů</span> <span data-cp="6A1C" data-bytes="95 58">•X</span> <span data-cp="6A29" data-bytes="87 B6">‡¶</span> <span data-cp="6A2B" data-bytes="98 5E">�^</span> <span data-cp="6A2D" data-bytes="94 CD">”Í</span> <span data-cp="6A33" data-bytes="93 EE">“î</span> <span data-cp="6A43" data-bytes="8C A3">ŚŁ</span> <span data-cp="6A4C" data-bytes="93 F5">“ő</span> <span data-cp="6A52" data-bytes="93 EF">“ď</span> <span data-cp="6A53" data-bytes="8E EA">Žę</span> <span data-cp="6A57" data-bytes="8F 5B">Ź[</span> <span data-cp="6A63" data-bytes="8C 5E">Ś^</span> <span 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data-cp="6B57" data-bytes="93 F8">“ř</span> <span data-cp="6B6F" data-bytes="8B F7">‹÷</span> <span data-cp="6B7A" data-bytes="8B CF">‹Ď</span> <span data-cp="6B81" data-bytes="8D D1">ŤŃ</span> <span data-cp="6BC1" data-bytes="8D D2">ŤŇ</span> <span data-cp="6BEA" data-bytes="8D D3">ŤÓ</span> <span data-cp="6BFA" data-bytes="9F E7">źç</span> <span data-cp="6C1C" data-bytes="90 BD">�˝</span> <span data-cp="6C31" data-bytes="9F D0">źĐ</span> <span data-cp="6C35" data-bytes="8B D0">‹Đ</span> <span data-cp="6C39" data-bytes="9C AE">ś®</span> <span data-cp="6C3A" data-bytes="8B D1">‹Ń</span> <span data-cp="6C3D" data-bytes="8A DB">ŠŰ</span> <span data-cp="6C4A" data-bytes="9E FD">žý</span> <span data-cp="6C58" data-bytes="95 CE">•Î</span> <span data-cp="6C75" data-bytes="8D D4">ŤÔ</span> <span data-cp="6C7F" data-bytes="8E E3">Žă</span> <span data-cp="6C9F" data-bytes="90 76">�v</span> <span data-cp="6CA2" data-bytes="98 C6">�Ć</span> <span data-cp="6CAA" data-bytes="8D D5">ŤŐ</span> <span data-cp="6CAF" data-bytes="97 D1">—Ń</span> <span data-cp="6CB2" data-bytes="9E B6">ž¶</span> <span data-cp="6CCE" data-bytes="A0 42"> B</span> <span data-cp="6CDF" data-bytes="98 73">�s</span> <span data-cp="6CEA" data-bytes="9F FC">źü</span> <span data-cp="6CFF" data-bytes="8C A5">ŚĄ</span> <span data-cp="6D02" data-bytes="8D D7">Ť×</span> <span data-cp="6D05" data-bytes="92 FB">’ű</span> <span data-cp="6D06" data-bytes="8D D8">ŤŘ</span> <span data-cp="6D24" data-bytes="94 4F">”O</span> <span data-cp="6D26" data-bytes="8D D9">ŤŮ</span> <span data-cp="6D4E" data-bytes="89 6B">‰k</span> <span data-cp="6D57" data-bytes="97 CE">—Î</span> <span data-cp="6D67" data-bytes="94 47">”G</span> <span data-cp="6D72" data-bytes="92 B7">’·</span> <span data-cp="6D81" data-bytes="8D DA">ŤÚ</span> <span data-cp="6D8F" data-bytes="9C 5A">śZ</span> <span data-cp="6DA4" data-bytes="8D DC">ŤÜ</span> <span data-cp="6DA5" data-bytes="94 44">”D</span> <span data-cp="6DB1" data-bytes="8D DD">ŤÝ</span> <span data-cp="6DB9" data-bytes="A0 D6"> Ö</span> <span data-cp="6DFE" data-bytes="8C 41">ŚA</span> <span data-cp="6E02" data-bytes="97 D5">—Ő</span> <span data-cp="6E04" data-bytes="94 4A">”J</span> <span data-cp="6E0A" data-bytes="94 4D">”M</span> <span data-cp="6E0F" data-bytes="97 CB">—Ë</span> <span data-cp="6E15" data-bytes="8D DE">ŤŢ</span> <span data-cp="6E18" data-bytes="8D DF">Ťß</span> <span data-cp="6E29" data-bytes="8D E0">Ťŕ</span> <span data-cp="6E57" data-bytes="8C DD">ŚÝ</span> <span data-cp="6E76" data-bytes="92 B3">’ł</span> <span data-cp="6E86" data-bytes="8D E1">Ťá</span> <span data-cp="6E8B" data-bytes="95 D3">•Ó</span> <span data-cp="6E9A" data-bytes="89 C1">‰Á</span> <span data-cp="6EB8" data-bytes="9C B7">ś·</span> <span data-cp="6EBB" data-bytes="8D E3">Ťă</span> <span data-cp="6EDA" data-bytes="8D E5">Ťĺ</span> <span data-cp="6EDD" data-bytes="89 47">‰G</span> <span data-cp="6EE2" data-bytes="8D E4">Ťä</span> <span data-cp="6EE8" data-bytes="8D E7">Ťç</span> <span 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data-cp="7050" data-bytes="8D F6">Ťö</span> <span data-cp="7054" data-bytes="8D F7">Ť÷</span> <span data-cp="705C" data-bytes="8F FA">Źú</span> <span data-cp="7067" data-bytes="97 D0">—Đ</span> <span data-cp="706C" data-bytes="8B D2">‹Ň</span> <span data-cp="706E" data-bytes="87 DE">‡Ţ</span> <span data-cp="706F" data-bytes="8D F8">Ťř</span> <span data-cp="7075" data-bytes="90 D9">�Ů</span> <span data-cp="7077" data-bytes="8C 47">ŚG</span> <span data-cp="707F" data-bytes="8D F9">Ťů</span> <span data-cp="7089" data-bytes="8D FA">Ťú</span> <span data-cp="708F" data-bytes="90 A6">�¦</span> <span data-cp="70A0" data-bytes="99 70">™p</span> <span data-cp="70A3" data-bytes="91 EB">‘ë</span> <span data-cp="70A5" data-bytes="97 70">—p</span> <span data-cp="70A6" data-bytes="98 6F">�o</span> <span data-cp="70B9" data-bytes="98 F2">�ň</span> <span data-cp="70BB" data-bytes="9A FC">šü</span> <span data-cp="70BC" data-bytes="89 6C">‰l</span> <span data-cp="70C0" data-bytes="99 5E">™^</span> <span data-cp="70C4" data-bytes="95 BD">•˝</span> <span data-cp="70D0" data-bytes="91 E6">‘ć</span> <span data-cp="70F1" data-bytes="94 54">”T</span> <span data-cp="70F5" data-bytes="99 B8">™¸</span> <span data-cp="70FE" data-bytes="97 E9">—é</span> <span data-cp="7105" data-bytes="93 46">“F</span> <span data-cp="711D" data-bytes="98 63">�c</span> <span data-cp="7129" data-bytes="95 BC">•Ľ</span> <span data-cp="7133" data-bytes="98 70">�p</span> <span data-cp="7134" data-bytes="96 F6">–ö</span> <span data-cp="7135" data-bytes="8E A9">Ž©</span> <span data-cp="713B" data-bytes="94 51">”Q</span> <span data-cp="713E" data-bytes="8E 43">ŽC</span> <span data-cp="7140" data-bytes="8B 5A">‹Z</span> <span data-cp="7151" data-bytes="9B F5">›ő</span> <span data-cp="7157" data-bytes="8C EE">Śî</span> <span data-cp="7162" data-bytes="A0 DF"> ß</span> <span data-cp="716B" data-bytes="97 7E">—~</span> <span data-cp="7171" data-bytes="9B D5">›Ő</span> <span data-cp="7173" data-bytes="9A C3">šĂ</span> <span data-cp="7175" data-bytes="97 C8">—Č</span> <span data-cp="7176" data-bytes="A0 DB"> Ű</span> <span data-cp="7177" data-bytes="91 D0">‘Đ</span> <span data-cp="717A" data-bytes="9F E4">źä</span> <span data-cp="717C" data-bytes="8F DD">ŹÝ</span> <span data-cp="717E" data-bytes="91 E9">‘é</span> <span data-cp="7188" data-bytes="98 E0">�ŕ</span> <span data-cp="718C" data-bytes="92 CA">’Ę</span> <span data-cp="718E" data-bytes="98 57">�W</span> <span data-cp="7191" data-bytes="8C 51">ŚQ</span> <span data-cp="7198" data-bytes="9B 49">›I</span> <span data-cp="71A2" data-bytes="9D 76">ťv</span> <span data-cp="71A3" data-bytes="9E AF">žŻ</span> <span data-cp="71AD" data-bytes="9C CC">śĚ</span> <span data-cp="71B7" data-bytes="8D F1">Ťń</span> <span data-cp="71D1" data-bytes="8E 53">ŽS</span> <span data-cp="71DF" data-bytes="9C 62">śb</span> <span data-cp="71EB" data-bytes="96 F9">–ů</span> <span data-cp="71F5" data-bytes="98 BF">�ż</span> <span data-cp="71F6" data-bytes="9E 49">žI</span> <span data-cp="7200" data-bytes="8C A7">Ś§</span> <span data-cp="7201" data-bytes="9B 76">›v</span> <span data-cp="7209" data-bytes="9B CA">›Ę</span> <span data-cp="720F" data-bytes="92 DC">’Ü</span> <span data-cp="7216" data-bytes="91 CC">‘Ě</span> <span data-cp="7217" data-bytes="91 E2">‘â</span> <span data-cp="7225" data-bytes="87 5F">‡_</span> <span data-cp="722B" data-bytes="8B D3">‹Ó</span> <span data-cp="7250" data-bytes="94 55">”U</span> <span data-cp="725C" data-bytes="8D BF">Ťż</span> <span data-cp="7266" data-bytes="9E 78">žx</span> <span data-cp="7287" data-bytes="94 56">”V</span> <span data-cp="728F" data-bytes="9D 61">ťa</span> <span data-cp="7294" data-bytes="94 57">”W</span> <span data-cp="729F" data-bytes="99 66">™f</span> <span data-cp="72AD" data-bytes="8B D5">‹Ő</span> <span data-cp="72B2" data-bytes="A0 69"> i</span> <span data-cp="72CD" data-bytes="98 B4">�´</span> <span data-cp="72E2" data-bytes="A0 49"> I</span> <span data-cp="7302" data-bytes="A0 4C"> L</span> <span data-cp="7304" data-bytes="9E 65">že</span> <span data-cp="7310" data-bytes="98 B5">�µ</span> <span data-cp="732A" data-bytes="99 75">™u</span> <span data-cp="732C" data-bytes="A0 65"> e</span> <span data-cp="7338" data-bytes="98 B7">�·</span> <span data-cp="7339" data-bytes="98 B8">�¸</span> <span data-cp="7341" data-bytes="98 BA">�ş</span> <span data-cp="7348" data-bytes="98 BB">�»</span> <span data-cp="734F" data-bytes="9F BC">źĽ</span> <span data-cp="7371" data-bytes="A0 4A"> J</span> <span data-cp="7374" data-bytes="9E C7">žÇ</span> <span data-cp="738C" data-bytes="8C A9">Ś©</span> <span data-cp="738F" data-bytes="98 AE">�®</span> <span data-cp="7398" data-bytes="92 D6">’Ö</span> <span data-cp="739E" data-bytes="91 D4">‘Ô</span> <span data-cp="73BA" data-bytes="8C 53">ŚS</span> <span data-cp="73C4" data-bytes="87 BF">‡ż</span> <span data-cp="73D0" data-bytes="94 C5">”Ĺ</span> <span data-cp="73E1" data-bytes="98 C1">�Á</span> <span data-cp="73E2" data-bytes="97 5C">—\</span> <span data-cp="73E6" data-bytes="97 73">—s</span> <span data-cp="73F3" data-bytes="97 64">—d</span> <span data-cp="73F9" data-bytes="96 4E">–N</span> <span data-cp="73FB" data-bytes="97 65">—e</span> <span data-cp="7402" data-bytes="8C 5A">ŚZ</span> <span data-cp="7411" data-bytes="89 A1">‰ˇ</span> <span data-cp="7412" data-bytes="95 FA">•ú</span> <span data-cp="7414" data-bytes="92 D4">’Ô</span> <span data-cp="7419" data-bytes="98 C8">�Č</span> <span data-cp="741C" data-bytes="90 EF">�ď</span> <span data-cp="741E" data-bytes="98 C9">�É</span> <span data-cp="741F" data-bytes="98 CA">�Ę</span> <span data-cp="7437" data-bytes="94 6D">”m</span> <span data-cp="7438" data-bytes="94 B7">”·</span> <span data-cp="743C" data-bytes="94 6B">”k</span> <span data-cp="7443" data-bytes="92 FC">’ü</span> <span data-cp="7445" data-bytes="95 EB">•ë</span> <span data-cp="7448" data-bytes="97 6E">—n</span> <span data-cp="744C" data-bytes="87 B8">‡¸</span> <span data-cp="7456" data-bytes="92 D5">’Ő</span> <span data-cp="7461" data-bytes="87 78">‡x</span> <span data-cp="7468" data-bytes="94 7A">”z</span> <span data-cp="746B" data-bytes="95 FB">•ű</span> <span data-cp="7479" data-bytes="92 D1">’Ń</span> <span data-cp="747A" data-bytes="94 5D">”]</span> <span data-cp="748C" data-bytes="93 44">“D</span> <span data-cp="748D" data-bytes="8E A6">Ž¦</span> <span data-cp="7499" data-bytes="92 D3">’Ó</span> <span data-cp="749B" data-bytes="94 B8">”¸</span> <span data-cp="749D" data-bytes="87 79">‡y</span> <span data-cp="74B4" data-bytes="97 5E">—^</span> <span data-cp="74B9" data-bytes="8C AD">Ś­</span> <span data-cp="74C6" data-bytes="87 C1">‡Á</span> <span data-cp="74CC" data-bytes="94 6A">”j</span> <span data-cp="74D0" data-bytes="93 E3">“ă</span> <span data-cp="74D3" data-bytes="98 CF">�Ď</span> <span data-cp="74E7" data-bytes="A0 D9"> Ů</span> <span data-cp="74F0" data-bytes="A0 BF"> ż</span> <span data-cp="74F1" data-bytes="A0 4D"> M</span> <span data-cp="74F2" data-bytes="A0 B8"> ¸</span> <span data-cp="74F8" data-bytes="A0 CE"> Î</span> <span data-cp="7505" data-bytes="A0 B7"> ·</span> <span data-cp="7519" data-bytes="89 C3">‰Ă</span> <span data-cp="7534" data-bytes="9D F4">ťô</span> <span data-cp="7535" data-bytes="89 6D">‰m</span> <span data-cp="753B" data-bytes="9C 7B">ś{</span> <span data-cp="7542" data-bytes="98 D2">�Ň</span> <span data-cp="7546" data-bytes="9F A9">ź©</span> <span data-cp="7551" data-bytes="97 D9">—Ů</span> <span data-cp="7553" data-bytes="A0 C4"> Ä</span> <span data-cp="7555" data-bytes="94 76">”v</span> <span data-cp="7560" data-bytes="99 78">™x</span> <span data-cp="756D" data-bytes="98 D3">�Ó</span> <span data-cp="7572" data-bytes="98 D4">�Ô</span> <span data-cp="757A" data-bytes="9F B9">źą</span> <span data-cp="7583" data-bytes="94 71">”q</span> <span data-cp="758D" data-bytes="98 D5">�Ő</span> <span data-cp="75B1" data-bytes="9E 5C">ž\</span> <span data-cp="75C3" data-bytes="A0 44"> D</span> <span data-cp="75C8" data-bytes="98 D7">�×</span> <span data-cp="75DC" data-bytes="98 D8">�Ř</span> <span data-cp="75F9" data-bytes="9E EF">žď</span> <span data-cp="7607" data-bytes="9F FE">źţ</span> <span data-cp="763B" data-bytes="9D DD">ťÝ</span> <span data-cp="7640" data-bytes="9E E1">žá</span> <span data-cp="764D" data-bytes="98 DA">�Ú</span> <span data-cp="764E" data-bytes="9D DF">ťß</span> <span data-cp="7654" data-bytes="9E EB">žë</span> <span data-cp="7666" data-bytes="9E 59">žY</span> <span data-cp="7667" data-bytes="A0 5C"> \</span> <span data-cp="7673" data-bytes="94 77">”w</span> <span data-cp="7674" data-bytes="98 DC">�Ü</span> <span data-cp="767A" data-bytes="98 DE">�Ţ</span> <span data-cp="76D6" data-bytes="9F C2">źÂ</span> <span data-cp="76D9" data-bytes="8C 6B">Śk</span> <span data-cp="770C" data-bytes="98 C4">�Ä</span> <span data-cp="770E" data-bytes="94 B0">”°</span> <span data-cp="770F" data-bytes="94 B1">”±</span> <span data-cp="7724" data-bytes="A0 C1"> Á</span> <span data-cp="772B" data-bytes="A0 CD"> Í</span> <span data-cp="7743" data-bytes="98 E5">�ĺ</span> <span data-cp="7772" data-bytes="91 E4">‘ä</span> <span data-cp="7777" data-bytes="8F C7">ŹÇ</span> <span data-cp="7778" data-bytes="94 AE">”®</span> <span data-cp="777A" data-bytes="8A 4F">ŠO</span> <span data-cp="777B" data-bytes="94 B2">”˛</span> <span data-cp="7793" data-bytes="8F D4">ŹÔ</span> <span data-cp="7798" data-bytes="98 EA">�ę</span> <span data-cp="77B9" data-bytes="9D E0">ťŕ</span> <span data-cp="77BE" data-bytes="98 EE">�î</span> <span data-cp="77C3" data-bytes="95 C4">•Ä</span> <span data-cp="77CB" data-bytes="98 EF">�ď</span> <span data-cp="77D7" data-bytes="9B 78">›x</span> <span data-cp="77DD" data-bytes="8C 6E">Śn</span> <span data-cp="77FE" data-bytes="A0 AE"> ®</span> <span data-cp="7808" data-bytes="9D 4C">ťL</span> <span data-cp="7818" data-bytes="98 F1">�ń</span> <span data-cp="781C" data-bytes="98 F3">�ó</span> <span data-cp="781E" data-bytes="94 C1">”Á</span> <span data-cp="7839" data-bytes="98 F5">�ő</span> <span data-cp="783D" data-bytes="96 E2">–â</span> <span data-cp="7842" data-bytes="94 50">”P</span> <span data-cp="7844" data-bytes="96 A2">–˘</span> <span data-cp="7847" data-bytes="98 F6">�ö</span> <span data-cp="784B" data-bytes="96 E5">–ĺ</span> <span data-cp="7851" data-bytes="98 F7">�÷</span> <span data-cp="7853" data-bytes="A0 46"> F</span> <span data-cp="7854" data-bytes="96 E3">–ă</span> <span data-cp="7866" data-bytes="98 F8">�ř</span> <span data-cp="787A" data-bytes="9E E4">žä</span> <span data-cp="7888" data-bytes="94 C3">”Ă</span> <span data-cp="788D" data-bytes="94 C2">”Â</span> <span data-cp="78B6" data-bytes="96 E4">–ä</span> <span data-cp="78B8" data-bytes="89 AC">‰¬</span> <span data-cp="78B9" data-bytes="96 DB">–Ű</span> <span data-cp="78D2" data-bytes="94 C4">”Ä</span> <span data-cp="78D8" data-bytes="9F FB">źű</span> <span data-cp="78E4" data-bytes="8C 59">ŚY</span> <span data-cp="78EE" data-bytes="93 C9">“É</span> <span data-cp="78F0" data-bytes="94 E8">”č</span> <span data-cp="78F5" data-bytes="90 C5">�Ĺ</span> <span data-cp="7906" data-bytes="A0 A8"> ¨</span> <span data-cp="7932" data-bytes="98 FD">�ý</span> <span data-cp="7933" data-bytes="98 FB">�ű</span> <span data-cp="7936" data-bytes="8E BF">Žż</span> <span data-cp="793B" data-bytes="8B D8">‹Ř</span> <span data-cp="7958" data-bytes="8F 68">Źh</span> <span data-cp="7959" data-bytes="94 C6">”Ć</span> <span data-cp="7962" data-bytes="9D EA">ťę</span> <span data-cp="797E" data-bytes="9C DA">śÚ</span> <span data-cp="7983" data-bytes="9C 72">śr</span> <span data-cp="7987" data-bytes="89 C9">‰É</span> <span data-cp="7991" data-bytes="99 41">™A</span> <span data-cp="7999" data-bytes="99 42">™B</span> <span data-cp="799B" data-bytes="94 CA">”Ę</span> <span data-cp="799F" data-bytes="91 D7">‘×</span> <span data-cp="79A5" data-bytes="94 CC">”Ě</span> <span data-cp="79C4" data-bytes="97 A8">—¨</span> <span data-cp="79CA" data-bytes="8C DE">ŚŢ</span> <span data-cp="79D0" data-bytes="87 B3">‡ł</span> <span data-cp="79E2" data-bytes="96 D1">–Ń</span> <span data-cp="79E3" data-bytes="9C BD">ś˝</span> <span data-cp="79F1" data-bytes="94 D5">”Ő</span> <span data-cp="79F4" data-bytes="94 D0">”Đ</span> <span data-cp="7A06" data-bytes="99 44">™D</span> <span data-cp="7A2A" data-bytes="8C 63">Śc</span> <span data-cp="7A2C" data-bytes="87 BB">‡»</span> <span data-cp="7A2D" data-bytes="A0 B3"> ł</span> <span data-cp="7A32" data-bytes="87 B4">‡´</span> <span data-cp="7A3A" data-bytes="94 CF">”Ď</span> <span data-cp="7A3E" data-bytes="9F FA">źú</span> <span data-cp="7A43" data-bytes="91 E5">‘ĺ</span> <span data-cp="7A45" data-bytes="9C 6A">śj</span> <span data-cp="7A49" data-bytes="8E 49">ŽI</span> <span data-cp="7A65" data-bytes="8E 4C">ŽL</span> <span data-cp="7A72" data-bytes="87 C9">‡É</span> <span data-cp="7A7D" data-bytes="8E 4D">ŽM</span> <span data-cp="7A83" data-bytes="9A 73">šs</span> <span data-cp="7A91" data-bytes="99 47">™G</span> <span data-cp="7A93" data-bytes="8C B1">Ś±</span> <span 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data-cp="7B0C" data-bytes="95 53">•S</span> <span data-cp="7B14" data-bytes="9F E5">źĺ</span> <span data-cp="7B1F" data-bytes="9F 56">źV</span> <span data-cp="7B27" data-bytes="95 4F">•O</span> <span data-cp="7B29" data-bytes="8E 5E">Ž^</span> <span data-cp="7B39" data-bytes="99 6A">™j</span> <span data-cp="7B42" data-bytes="9C 64">śd</span> <span data-cp="7B43" data-bytes="9C D9">śŮ</span> <span data-cp="7B51" data-bytes="9D 5A">ťZ</span> <span data-cp="7B55" data-bytes="8E 5D">Ž]</span> <span data-cp="7B62" data-bytes="99 50">™P</span> <span data-cp="7B6C" data-bytes="99 51">™Q</span> <span data-cp="7B6F" data-bytes="8E 62">Žb</span> <span data-cp="7B7B" data-bytes="99 52">™R</span> <span data-cp="7B92" data-bytes="8E 68">Žh</span> <span data-cp="7BA2" data-bytes="8E 61">Ža</span> <span data-cp="7BA3" data-bytes="9F 59">źY</span> <span data-cp="7BAE" data-bytes="87 D0">‡Đ</span> <span data-cp="7BB2" data-bytes="8B B3">‹ł</span> <span data-cp="7BB8" data-bytes="8E 69">Ži</span> <span data-cp="7BC5" data-bytes="87 B9">‡ą</span> <span data-cp="7BCF" data-bytes="9F 5D">ź]</span> <span data-cp="7BD0" data-bytes="8E 66">Žf</span> <span data-cp="7BEC" data-bytes="8C B2">Ś˛</span> <span data-cp="7BFA" data-bytes="8E 6E">Žn</span> <span data-cp="7BFC" data-bytes="9F 64">źd</span> <span data-cp="7C06" data-bytes="8E 6F">Žo</span> <span data-cp="7C12" data-bytes="99 53">™S</span> <span data-cp="7C1B" data-bytes="99 54">™T</span> <span data-cp="7C35" data-bytes="8E 70">Žp</span> <span data-cp="7C42" data-bytes="9F 61">źa</span> <span data-cp="7C44" data-bytes="8E 72">Žr</span> <span data-cp="7C51" data-bytes="A0 6B"> k</span> <span data-cp="7C56" data-bytes="9F 40">ź@</span> <span data-cp="7C5D" data-bytes="94 ED">”í</span> <span data-cp="7C6D" data-bytes="94 EE">”î</span> <span data-cp="7C70" data-bytes="9F BD">ź˝</span> <span data-cp="7C74" data-bytes="8E 7B">Ž{</span> <span data-cp="7C7B" data-bytes="99 57">™W</span> <span data-cp="7C7C" data-bytes="94 F7">”÷</span> <span 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data-cp="7CF5" data-bytes="8E 7D">Ž}</span> <span data-cp="7CF9" data-bytes="8B D9">‹Ů</span> <span data-cp="7CFC" data-bytes="89 A2">‰˘</span> <span data-cp="7D25" data-bytes="9E D7">ž×</span> <span data-cp="7D4D" data-bytes="A0 B6"> ¶</span> <span data-cp="7D5A" data-bytes="9E 42">žB</span> <span data-cp="7D5D" data-bytes="8E A4">Ž¤</span> <span data-cp="7D89" data-bytes="8E A7">Ž§</span> <span data-cp="7D8B" data-bytes="8C 76">Śv</span> <span data-cp="7D95" data-bytes="87 67">‡g</span> <span data-cp="7D97" data-bytes="95 42">•B</span> <span data-cp="7DA4" data-bytes="98 7D">�}</span> <span data-cp="7DA8" data-bytes="97 55">—U</span> <span data-cp="7DAB" data-bytes="8E A8">Ž¨</span> <span data-cp="7DB3" data-bytes="8E AA">ŽŞ</span> <span data-cp="7DCD" data-bytes="89 A3">‰Ł</span> <span data-cp="7DCF" data-bytes="99 60">™`</span> <span data-cp="7DD0" data-bytes="99 62">™b</span> <span data-cp="7DD2" data-bytes="8E AB">Ž«</span> <span data-cp="7DD3" data-bytes="94 FC">”ü</span> <span data-cp="7DD4" data-bytes="99 61">™a</span> <span data-cp="7DDC" data-bytes="94 FA">”ú</span> <span data-cp="7DE4" data-bytes="8E AE">Ž®</span> <span data-cp="7DE5" data-bytes="8E B2">Ž˛</span> <span data-cp="7DF5" data-bytes="8E B0">Ž°</span> <span data-cp="7DFD" data-bytes="99 63">™c</span> <span data-cp="7DFE" data-bytes="97 AA">—Ş</span> <span data-cp="7E07" data-bytes="94 FB">”ű</span> <span data-cp="7E1D" data-bytes="8E B4">Ž´</span> <span data-cp="7E27" data-bytes="8E BB">Ž»</span> <span data-cp="7E5B" data-bytes="8C DC">ŚÜ</span> <span data-cp="7E65" data-bytes="98 76">�v</span> <span data-cp="7E67" data-bytes="8E A1">Žˇ</span> <span data-cp="7E6C" data-bytes="8C B4">Ś´</span> <span data-cp="7E6E" data-bytes="8E B7">Ž·</span> <span data-cp="7E7F" data-bytes="9D A6">ť¦</span> <span data-cp="7E87" data-bytes="9B 7B">›{</span> <span data-cp="7E8E" data-bytes="9E B0">ž°</span> <span data-cp="7E92" data-bytes="8E B8">Ž¸</span> <span data-cp="7E9F" data-bytes="9D 70">ťp</span> <span data-cp="7EA4" data-bytes="89 6E">‰n</span> <span data-cp="7EAC" data-bytes="89 6F">‰o</span> <span data-cp="7EBA" data-bytes="89 70">‰p</span> <span data-cp="7EC7" data-bytes="89 71">‰q</span> <span data-cp="7ECF" data-bytes="89 72">‰r</span> <span data-cp="7EDF" data-bytes="89 73">‰s</span> <span data-cp="7F06" data-bytes="89 74">‰t</span> <span data-cp="7F37" data-bytes="89 75">‰u</span> <span data-cp="7F40" data-bytes="8E BC">ŽĽ</span> <span data-cp="7F41" data-bytes="8E BD">Ž˝</span> <span data-cp="7F47" data-bytes="8E BE">Žľ</span> <span data-cp="7F49" data-bytes="9D D1">ťŃ</span> <span data-cp="7F4E" data-bytes="94 FD">”ý</span> <span data-cp="7F52" data-bytes="8B D7">‹×</span> <span data-cp="7F53" data-bytes="8B DA">‹Ú</span> <span data-cp="7F71" data-bytes="A0 E2"> â</span> <span data-cp="7F78" data-bytes="9F E9">źé</span> <span data-cp="7F93" data-bytes="8A E7">Šç</span> <span data-cp="7F97" data-bytes="8E C2">ŽÂ</span> <span data-cp="7FA3" data-bytes="8E C4">ŽÄ</span> <span data-cp="7FAE" data-bytes="99 64">™d</span> <span data-cp="7FB4" data-bytes="99 65">™e</span> <span data-cp="7FDD" data-bytes="95 4E">•N</span> <span data-cp="7FE7" data-bytes="98 B3">�ł</span> <span data-cp="7FFA" data-bytes="8E CB">ŽË</span> <span data-cp="8002" data-bytes="8B DF">‹ß</span> <span data-cp="8005" data-bytes="8E CD">ŽÍ</span> <span data-cp="8008" data-bytes="8E CE">ŽÎ</span> <span data-cp="801D" data-bytes="8E CF">ŽĎ</span> <span data-cp="8020" data-bytes="99 68">™h</span> <span data-cp="8025" data-bytes="99 69">™i</span> <span data-cp="8028" data-bytes="8E D0">ŽĐ</span> <span data-cp="802E" data-bytes="99 6B">™k</span> <span data-cp="802F" data-bytes="8E D1">ŽŃ</span> <span data-cp="8031" data-bytes="99 6C">™l</span> <span data-cp="803B" data-bytes="8E D4">ŽÔ</span> <span data-cp="803C" data-bytes="8E D5">ŽŐ</span> <span data-cp="8054" data-bytes="99 6D">™m</span> <span data-cp="805B" data-bytes="A0 BE"> ľ</span> <span data-cp="8061" data-bytes="8E D6">ŽÖ</span> <span data-cp="8062" data-bytes="A0 BC"> Ľ</span> <span data-cp="8063" data-bytes="A0 B5"> µ</span> <span data-cp="8066" data-bytes="A0 B4"> ´</span> <span data-cp="8080" data-bytes="8B E0">‹ŕ</span> <span data-cp="809F" data-bytes="89 B5">‰µ</span> <span data-cp="80A7" data-bytes="8E DD">ŽÝ</span> <span data-cp="80B6" data-bytes="9E 5D">ž]</span> <span data-cp="80B7" data-bytes="99 71">™q</span> <span data-cp="80BC" data-bytes="89 AE">‰®</span> <span data-cp="80BD" data-bytes="9D E8">ťč</span> <span data-cp="80C6" data-bytes="95 65">•e</span> <span data-cp="80E9" data-bytes="99 72">™r</span> <span data-cp="80EC" data-bytes="8B 5C">‹\</span> <span data-cp="80F6" data-bytes="89 B1">‰±</span> <span data-cp="8103" data-bytes="A0 C0"> Ŕ</span> <span data-cp="8107" data-bytes="8E DF">Žß</span> <span data-cp="8109" data-bytes="95 66">•f</span> <span data-cp="810C" data-bytes="99 74">™t</span> <span data-cp="810E" data-bytes="99 76">™v</span> <span data-cp="8112" data-bytes="99 77">™w</span> <span data-cp="8114" data-bytes="99 79">™y</span> <span data-cp="8117" data-bytes="9D DA">ťÚ</span> <span data-cp="811A" data-bytes="8E E0">Žŕ</span> <span data-cp="812A" data-bytes="93 5C">“\</span> <span data-cp="8132" data-bytes="9D E6">ťć</span> <span data-cp="8134" data-bytes="8B 5F">‹_</span> <span data-cp="8137" data-bytes="95 63">•c</span> <span data-cp="8142" data-bytes="95 67">•g</span> <span data-cp="8148" data-bytes="9D E3">ťă</span> <span data-cp="8156" data-bytes="99 7C">™|</span> <span data-cp="8159" data-bytes="99 7D">™}</span> <span data-cp="815A" data-bytes="99 7E">™~</span> <span data-cp="816C" data-bytes="8C FB">Śű</span> <span data-cp="816D" data-bytes="8B 5B">‹[</span> <span data-cp="817C" data-bytes="99 A3">™Ł</span> <span data-cp="8184" data-bytes="99 A4">™¤</span> <span data-cp="8193" data-bytes="99 A6">™¦</span> <span data-cp="81A5" data-bytes="99 A8">™¨</span> <span data-cp="81AA" data-bytes="8A BE">Šľ</span> <span data-cp="81B6" data-bytes="9E 61">ža</span> <span data-cp="81C1" data-bytes="99 AA">™Ş</span> <span data-cp="81C8" data-bytes="A0 C8"> Č</span> <span data-cp="81E4" data-bytes="99 AB">™«</span> <span data-cp="81F6" data-bytes="98 C2">�Â</span> <span data-cp="8218" data-bytes="8E E8">Žč</span> <span data-cp="821A" data-bytes="A0 BA"> ş</span> <span data-cp="8229" data-bytes="8E EE">Žî</span> <span data-cp="822D" data-bytes="9E BF">žż</span> <span data-cp="823E" data-bytes="89 C2">‰Â</span> <span data-cp="8254" data-bytes="99 AC">™¬</span> <span data-cp="8262" data-bytes="95 6B">•k</span> <span data-cp="8265" data-bytes="95 6C">•l</span> <span data-cp="8276" data-bytes="99 AF">™Ż</span> <span data-cp="8279" data-bytes="99 4A">™J</span> <span data-cp="827A" data-bytes="89 76">‰v</span> <span data-cp="827B" data-bytes="8F 48">ŹH</span> <span data-cp="82A6" data-bytes="99 AE">™®</span> <span data-cp="82AA" data-bytes="8E FB">Žű</span> <span data-cp="82BF" data-bytes="8C D0">ŚĐ</span> <span data-cp="82C4" data-bytes="8B 52">‹R</span> <span data-cp="82CA" data-bytes="99 B0">™°</span> <span data-cp="82CF" data-bytes="89 77">‰w</span> <span data-cp="82D0" data-bytes="8F 41">ŹA</span> <span data-cp="82D8" data-bytes="99 B1">™±</span> <span data-cp="82E2" data-bytes="8F 49">ŹI</span> <span data-cp="82F7" data-bytes="9D E4">ťä</span> <span data-cp="82F8" data-bytes="8C B5">Śµ</span> <span data-cp="82FD" data-bytes="9B 54">›T</span> <span data-cp="82FF" data-bytes="99 B2">™˛</span> <span data-cp="830B" data-bytes="9E 68">žh</span> <span data-cp="8318" data-bytes="8F 4A">ŹJ</span> <span data-cp="831A" data-bytes="8F 42">ŹB</span> <span data-cp="831D" data-bytes="8F 51">ŹQ</span> <span data-cp="833D" data-bytes="98 46">�F</span> <span data-cp="8357" data-bytes="99 B4">™´</span> <span data-cp="8362" data-bytes="8E F5">Žő</span> <span data-cp="8366" data-bytes="9C CD">śÍ</span> <span data-cp="836F" data-bytes="89 78">‰x</span> <span data-cp="8385" data-bytes="8F 53">ŹS</span> <span data-cp="8391" data-bytes="8F 6F">Źo</span> <span data-cp="839C" data-bytes="8E 63">Žc</span> <span data-cp="83AC" data-bytes="8F 56">ŹV</span> <span data-cp="83BE" data-bytes="9F C6">źĆ</span> <span data-cp="83C1" data-bytes="8F 57">ŹW</span> <span data-cp="83CF" data-bytes="9C 77">św</span> <span data-cp="83D3" data-bytes="8F 58">ŹX</span> <span data-cp="83ED" data-bytes="98 48">�H</span> <span data-cp="8405" data-bytes="99 B7">™·</span> <span data-cp="840F" data-bytes="8F 6E">Źn</span> <span data-cp="8414" data-bytes="96 65">–e</span> <span data-cp="8418" data-bytes="9D E7">ťç</span> <span data-cp="841C" data-bytes="9E 62">žb</span> <span data-cp="8420" data-bytes="96 CC">–Ě</span> <span data-cp="8421" data-bytes="8E 67">Žg</span> <span data-cp="8426" data-bytes="98 7E">�~</span> <span data-cp="843E" data-bytes="97 FC">—ü</span> <span data-cp="8448" data-bytes="98 F9">�ů</span> <span data-cp="844A" data-bytes="8F 66">Źf</span> <span data-cp="8453" data-bytes="95 6E">•n</span> <span data-cp="8455" data-bytes="92 45">’E</span> <span data-cp="8458" data-bytes="8F 60">Ź`</span> <span data-cp="845C" data-bytes="9E D1">žŃ</span> <span data-cp="8464" data-bytes="99 B9">™ą</span> <span data-cp="8471" data-bytes="8F 62">Źb</span> <span data-cp="8472" data-bytes="97 4C">—L</span> <span data-cp="847F" data-bytes="91 C7">‘Ç</span> <span data-cp="8480" data-bytes="95 5F">•_</span> <span data-cp="8484" data-bytes="87 AB">‡«</span> <span data-cp="8488" data-bytes="99 BB">™»</span> <span data-cp="8492" data-bytes="8E 6D">Žm</span> <span data-cp="8493" data-bytes="8F 71">Źq</span> <span data-cp="8496" data-bytes="94 CB">”Ë</span> <span data-cp="84A3" data-bytes="95 B1">•±</span> <span data-cp="84A8" data-bytes="8F 69">Źi</span> <span data-cp="84AD" data-bytes="9A F2">šň</span> <span data-cp="84BD" data-bytes="96 C3">–Ă</span> <span data-cp="84BE" data-bytes="99 BD">™˝</span> <span data-cp="84DA" data-bytes="A0 CF"> Ď</span> <span data-cp="84DE" data-bytes="8F 6D">Źm</span> <span data-cp="84E1" data-bytes="99 BE">™ľ</span> <span 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data-cp="9AB6" data-bytes="8B 57">‹W</span> <span data-cp="9ABA" data-bytes="9F E1">źá</span> <span data-cp="9ABD" data-bytes="9B 5F">›_</span> <span data-cp="9AD7" data-bytes="A0 5D"> ]</span> <span data-cp="9AE0" data-bytes="91 5B">‘[</span> <span data-cp="9AE2" data-bytes="91 5C">‘\</span> <span data-cp="9AF4" data-bytes="91 5E">‘^</span> <span data-cp="9AFF" data-bytes="9F 5C">ź\</span> <span data-cp="9B02" data-bytes="9F 57">źW</span> <span data-cp="9B09" data-bytes="9F 65">źe</span> <span data-cp="9B0F" data-bytes="9A 72">šr</span> <span data-cp="9B14" data-bytes="91 60">‘`</span> <span data-cp="9B2A" data-bytes="9F 5E">ź^</span> <span data-cp="9B2D" data-bytes="91 61">‘a</span> <span data-cp="9B2E" data-bytes="9F 60">ź`</span> <span data-cp="9B34" data-bytes="91 64">‘d</span> <span data-cp="9B39" data-bytes="9F 41">źA</span> <span data-cp="9B40" data-bytes="91 69">‘i</span> <span data-cp="9B50" data-bytes="91 68">‘h</span> <span data-cp="9B69" data-bytes="9A 74">št</span> <span 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data-cp="9D39" data-bytes="91 A7">‘§</span> <span data-cp="9D44" data-bytes="A0 5E"> ^</span> <span data-cp="9D49" data-bytes="9A 7D">š}</span> <span data-cp="9D4E" data-bytes="89 48">‰H</span> <span data-cp="9D50" data-bytes="9E B1">ž±</span> <span data-cp="9D5E" data-bytes="9D DB">ťŰ</span> <span data-cp="9D6D" data-bytes="95 BF">•ż</span> <span data-cp="9D6E" data-bytes="8A 73">Šs</span> <span data-cp="9D7C" data-bytes="9E FE">žţ</span> <span data-cp="9D7E" data-bytes="91 7A">‘z</span> <span data-cp="9D83" data-bytes="91 7B">‘{</span> <span data-cp="9D93" data-bytes="9A A3">šŁ</span> <span data-cp="9DA5" data-bytes="96 C2">–Â</span> <span data-cp="9DAB" data-bytes="9F 77">źw</span> <span data-cp="9DBD" data-bytes="9A A4">š¤</span> <span data-cp="9DC0" data-bytes="9A A5">šĄ</span> <span data-cp="9DC4" data-bytes="91 A1">‘ˇ</span> <span data-cp="9DC9" data-bytes="89 B8">‰¸</span> <span data-cp="9DD4" data-bytes="91 73">‘s</span> <span data-cp="9DF0" data-bytes="9C 6B">śk</span> <span data-cp="9DFC" data-bytes="9A A6">š¦</span> <span data-cp="9E0A" data-bytes="89 BD">‰˝</span> <span data-cp="9E0C" data-bytes="89 B9">‰ą</span> <span data-cp="9E0E" data-bytes="91 7D">‘}</span> <span data-cp="9E18" data-bytes="96 BB">–»</span> <span data-cp="9E1C" data-bytes="9F F2">źň</span> <span data-cp="9E1F" data-bytes="8B F5">‹ő</span> <span data-cp="9E7B" data-bytes="9A A9">š©</span> <span data-cp="9E81" data-bytes="9F 54">źT</span> <span data-cp="9E84" data-bytes="9F E3">źă</span> <span data-cp="9E85" data-bytes="9E ED">ží</span> <span data-cp="9E90" data-bytes="91 AA">‘Ş</span> <span data-cp="9E95" data-bytes="91 AB">‘«</span> <span data-cp="9E96" data-bytes="A0 70"> p</span> <span data-cp="9E98" data-bytes="9F 6D">źm</span> <span data-cp="9E9E" data-bytes="91 AC">‘¬</span> <span data-cp="9EA2" data-bytes="91 AD">‘­</span> <span data-cp="9EA6" data-bytes="A0 FD"> ý</span> <span data-cp="9EA8" data-bytes="9F E2">źâ</span> <span data-cp="9EAA" data-bytes="91 AF">‘Ż</span> <span data-cp="9EAB" data-bytes="9E 41">žA</span> <span data-cp="9EAC" data-bytes="9A AA">šŞ</span> <span data-cp="9EAF" data-bytes="91 B0">‘°</span> <span data-cp="9EB1" data-bytes="9A AB">š«</span> <span data-cp="9EBD" data-bytes="9A AC">š¬</span> <span data-cp="9EBF" data-bytes="9A 4A">šJ</span> <span data-cp="9EC1" data-bytes="91 B2">‘˛</span> <span data-cp="9EC4" data-bytes="8B F6">‹ö</span> <span data-cp="9EC6" data-bytes="9A AD">š­</span> <span data-cp="9EC7" data-bytes="89 B6">‰¶</span> <span data-cp="9EE2" data-bytes="9A AF">šŻ</span> <span data-cp="9EF1" data-bytes="9A B0">š°</span> <span data-cp="9EF8" data-bytes="9A B1">š±</span> <span data-cp="9EFE" data-bytes="9A A1">šˇ</span> <span data-cp="9F02" data-bytes="91 B9">‘ą</span> <span data-cp="9F08" data-bytes="91 BA">‘ş</span> <span data-cp="9F16" data-bytes="91 BF">‘ż</span> <span data-cp="9F17" data-bytes="91 BE">‘ľ</span> <span data-cp="9F26" data-bytes="A0 41"> A</span> <span data-cp="9F27" data-bytes="8B B7">‹·</span> <span data-cp="9F39" data-bytes="91 C0">‘Ŕ</span> <span data-cp="9F44" data-bytes="9A B3">šł</span> <span data-cp="9F45" data-bytes="91 C3">‘Ă</span> <span data-cp="9F50" data-bytes="A0 FC"> ü</span> <span data-cp="9F53" data-bytes="9F EE">źî</span> <span data-cp="9F5A" data-bytes="9F 69">źi</span> <span data-cp="9F62" data-bytes="91 C8">‘Č</span> <span data-cp="9F69" data-bytes="91 C9">‘É</span> <span data-cp="9F7F" data-bytes="8D E6">Ťć</span> <span data-cp="9F8E" data-bytes="91 CB">‘Ë</span> <span data-cp="9F96" data-bytes="87 AC">‡¬</span> <span data-cp="9F97" data-bytes="87 A4">‡¤</span> <span data-cp="9F99" data-bytes="89 C8">‰Č</span> <span data-cp="9F9F" data-bytes="8D AA">ŤŞ</span> <span data-cp="9FA5" data-bytes="9F DD">źÝ</span> <span data-cp="9FA6" data-bytes="8C 43">ŚC</span> <span data-cp="9FA7" data-bytes="8C 6D">Śm</span> <span data-cp="9FA8" data-bytes="8C 74">Śt</span> <span data-cp="9FA9" data-bytes="8C B7">Ś·</span> <span data-cp="9FAA" data-bytes="8C B9">Śą</span> <span data-cp="9FAB" data-bytes="8C BB">Ś»</span> <span data-cp="9FAC" data-bytes="8C C0">ŚŔ</span> <span data-cp="9FAD" data-bytes="8C D7">Ś×</span> <span data-cp="9FAE" data-bytes="8C D8">ŚŘ</span> <span data-cp="9FAF" data-bytes="8C DA">ŚÚ</span> <span data-cp="9FB2" data-bytes="8C ED">Śí</span> <span data-cp="9FB3" data-bytes="8D 48">ŤH</span> <span data-cp="9FC7" data-bytes="87 C2">‡Â</span> <span data-cp="9FC8" data-bytes="87 D2">‡Ň</span> <span data-cp="9FC9" data-bytes="87 D6">‡Ö</span> <span data-cp="9FCA" data-bytes="87 DA">‡Ú</span> <span data-cp="9FCB" data-bytes="87 DF">‡ß</span> <span data-cp="F907" data-bytes="8B F8">‹ř</span> </body></html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/fetch.http.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/fetch.http.html
new file mode 100644
index 00000000000..d0cb7206f8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/fetch.http.html
@@ -0,0 +1,143 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! Generated by `common/security-features/tools/generate.py --spec referrer-policy/4K-1/` -->
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="timeout" content="long">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/security-features/resources/common.sub.js"></script>
+    <script src="../../../../generic/test-case.sub.js"></script>
+    <script src="../../../generic/test-case.sub.js"></script>
+  </head>
+  <body>
+    <script>
+      TestCase(
+        [
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-http",
+            "redirection": "keep-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-http origin and keep-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-http",
+            "redirection": "no-redirect",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-http origin and no-redirect redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-http",
+            "redirection": "swap-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-http origin and swap-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-https",
+            "redirection": "keep-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-https origin and keep-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-https",
+            "redirection": "no-redirect",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-https origin and no-redirect redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "cross-https",
+            "redirection": "swap-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to cross-https origin and swap-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-http",
+            "redirection": "keep-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-http origin and keep-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-http",
+            "redirection": "no-redirect",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-http origin and no-redirect redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-http",
+            "redirection": "swap-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-http origin and swap-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-https",
+            "redirection": "keep-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-https origin and keep-origin redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-https",
+            "redirection": "no-redirect",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-https origin and no-redirect redirection from http context."
+          },
+          {
+            "expectation": "stripped-referrer",
+            "origin": "same-https",
+            "redirection": "swap-origin",
+            "source_context_list": [],
+            "source_scheme": "http",
+            "subresource": "fetch",
+            "subresource_policy_deliveries": [],
+            "test_description": "Referrer Policy: Expects stripped-referrer for fetch to same-https origin and swap-origin redirection from http context."
+          }
+        ],
+        new SanityChecker()
+      ).start();
+    </script>
+    <div id="log"></div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/filter-turbulence-invalid-001.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/filter-turbulence-invalid-001.html
new file mode 100644
index 00000000000..7400c8b3793
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/filter-turbulence-invalid-001.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<title>CSS Filter Effects: feTurbulence with negative values from baseFrequency</title>
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#element-attrdef-feturbulence-basefrequency">
+<link rel="help" href="https://crbug.com/1068863"/>
+<link rel="match" href="reference/filter-turbulence-invalid-001-ref.html">
+<meta name="assert" content="This test checks that negative baseFrequency values are unsupported for feTurbulence.">
+<style>
+.target {
+  display: inline-block;
+  width: 100px;
+  height: 100px;
+  background-color: red;
+}
+</style>
+<div class="target" style="filter: url(#fn1)"></div>
+<div class="target" style="filter: url(#fn2)"></div>
+<div class="target" style="filter: url(#tb1)"></div>
+<div class="target" style="filter: url(#tb2)"></div>
+<svg height="0" color-interpolation-filters="sRGB">
+    <!-- type=fractalNoise -->
+    <filter id="fn1" x="0" y="0" width="1" height="1">
+        <feTurbulence type="fractalNoise" baseFrequency="-1 1"/>
+        <feComponentTransfer>
+            <feFuncR type="discrete" tableValues="1 0 1"/>
+            <feFuncG type="discrete" tableValues="0 0.502 0"/> <!-- map [0..1/3] -> 0; [1/3...2/3] -> 0.502; [2/3..1] -> 0 -->
+            <feFuncB type="discrete" tableValues="0"/>
+            <feFuncA type="discrete" tableValues="0 1 0"/>
+        </feComponentTransfer>
+    </filter>
+
+    <filter id="fn2" x="0" y="0" width="1" height="1">
+        <feTurbulence type="fractalNoise" baseFrequency="1 -1"/>
+        <feComponentTransfer>
+            <feFuncR type="discrete" tableValues="1 0 1"/>
+            <feFuncG type="discrete" tableValues="0 0.502 0"/> <!-- map [0..1/3] -> 0; [1/3...2/3] -> 0.502; [2/3..1] -> 0 -->
+            <feFuncB type="discrete" tableValues="0"/>
+            <feFuncA type="discrete" tableValues="0 1 0"/>
+        </feComponentTransfer>
+    </filter>
+
+    <!-- type=turbulence -->
+    <filter id="tb1" x="0" y="0" width="1" height="1">
+        <feTurbulence type="turbulence" baseFrequency="-1 1"/>
+        <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.502, 0 0 1 0 0, 0 0 0 1 1"/>
+    </filter>
+
+    <filter id="tb2" x="0" y="0" width="1" height="1">
+        <feTurbulence type="turbulence" baseFrequency="1 -1"/>
+        <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.502, 0 0 1 0 0, 0 0 0 1 1"/>
+    </filter>
+</svg>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/grid-auto-fill-rows-001.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/grid-auto-fill-rows-001.html
new file mode 100644
index 00000000000..afce3f5fa91
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/grid-auto-fill-rows-001.html
@@ -0,0 +1,184 @@
+<!DOCTYPE html>
+<title>CSS Grid: auto-fill rows</title>
+<link rel="author" title="Sergio Villar" href="mailto: svillar@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#valdef-repeat-auto-fill">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-columns">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-rows">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-grid-row-gap">
+<link rel="help" href="https://crbug.com/619930">
+<link rel="help" href="https://crbug.com/589460">
+<link rel="help" href="https://crbug.com/648814">
+<meta name="assert" content="Check that auto-fill rows are properly computed in a grid container"/>
+<link href="/css/support/grid.css" rel="stylesheet">
+<style>
+
+.grid {
+    border: 2px solid magenta;
+    height: 200px;
+    width: 25px;
+    align-content: start;
+    grid-auto-rows: 157px;
+    grid-auto-columns: 25px;
+
+    float: left;
+    position: relative;
+    margin-right: 2px;
+}
+
+.gridOnlyAutoRepeat { grid-template-rows: repeat(auto-fill, 30px [autobar]); }
+.gridAutoRepeatAndFixedBefore { grid-template-rows: 10px [foo] 20% [bar] repeat(auto-fill, [autofoo] 35px); }
+.gridAutoRepeatAndFixedAfter { grid-template-rows: repeat(auto-fill, [first] 30px [last]) [foo] minmax(60px, 80px) [bar] minmax(45px, max-content); }
+.gridAutoRepeatAndFixed { grid-template-rows: [start] repeat(2, 50px [a]) [middle] repeat(auto-fill, [autofoo] 15px [autobar]) minmax(5%, 10%) [end]; }
+.gridMultipleNames { grid-template-rows: [start] 20px [foo] 50% repeat(auto-fill, [bar] 20px [start foo]) [foo] 10% [end bar]; }
+.gridMultipleTracks { grid-template-rows: [start] 20px repeat(auto-fill, [a] 2em [b c] 10% [d]) [e] minmax(75px, 1fr) [last]; }
+
+.item { background-color: blue; }
+.item:nth-child(2) { background: green; }
+.item:nth-child(3) { background: orange; }
+
+.gap { grid-row-gap: 20px; }
+
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body onload="checkLayout('.grid')">
+<div id="log"></div>
+
+<p>This test checks that repeat(auto-fill, ) syntax works as expected.</p>
+
+<div class="grid gridOnlyAutoRepeat">
+    <div class="item" style="grid-row: 1 / span 6" data-offset-y="0" data-offset-x="0" data-expected-height="180" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridOnlyAutoRepeat">
+    <div class="item" style="grid-row: 1 / span 6 autobar" data-offset-y="0" data-offset-x="0" data-expected-height="180" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridOnlyAutoRepeat gap">
+    <div class="item" style="grid-row: 1 / span 5" data-offset-y="0" data-offset-x="0" data-expected-height="357" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridOnlyAutoRepeat gap">
+    <div class="item" style="grid-row: autobar 2 / span 3" data-offset-y="100" data-offset-x="0" data-expected-height="257" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridOnlyAutoRepeat gap" style="height: auto; max-height: 90px;" data-expected-height="94" data-expected-width="29">
+    <div class="item" data-offset-y="0" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+    <div class="item" data-offset-y="50" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+    <div class="item" data-offset-y="100" data-offset-x="0" data-expected-height="157" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridOnlyAutoRepeat gap" style="height: auto; max-height: 90px; min-height: 130px;" data-expected-height="134" data-expected-width="29">
+    <div class="item" data-offset-y="0" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+    <div class="item" data-offset-y="50" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+    <div class="item" data-offset-y="100" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore">
+    <div class="item" style="grid-row: 1 / span 6" data-offset-y="0" data-offset-x="0" data-expected-height="190" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore">
+    <div class="item" style="grid-row: foo / autofoo" data-offset-y="10" data-offset-x="0" data-expected-height="40" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore">
+    <div class="item" style="grid-row: bar / 5 autofoo" data-offset-y="50" data-offset-x="0" data-expected-height="297" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore gap">
+    <div class="item" style="grid-row: 1 / span 4" data-offset-y="0" data-offset-x="0" data-expected-height="180" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore gap">
+    <div class="item" style="grid-row: span 3 / 2 autofoo" data-offset-y="0" data-offset-x="0" data-expected-height="125" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedBefore gap">
+    <div class="item" style="grid-row: notPresent / 3 autofoo" data-offset-y="377" data-offset-x="0" data-expected-height="157" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter">
+    <div class="item" style="grid-row: 1 / span 4" data-offset-y="0" data-offset-x="0" data-expected-height="185" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter">
+    <div class="item" style="grid-row: first / last 2" data-offset-y="0" data-offset-x="0" data-expected-height="60" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter">
+    <div class="item" style="grid-row: last 2 / foo" data-offset-y="60" data-offset-x="0" data-expected-height="80" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter gap">
+    <div class="item" style="grid-row: 1 / span 3" data-offset-y="0" data-offset-x="0" data-expected-height="195" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter gap">
+    <div class="item" style="grid-row: 3 / span 1 bar" data-offset-y="130" data-offset-x="0" data-expected-height="222" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixedAfter gap">
+    <div class="item" style="grid-row: first / foo" data-offset-y="0" data-offset-x="0" data-expected-height="30" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixed">
+    <div class="item" style="grid-row: 1 / span 8" data-offset-y="0" data-offset-x="0" data-expected-height="195" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixed">
+    <div class="item" style="grid-row: a / autobar 2" data-offset-y="50" data-offset-x="0" data-expected-height="80" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixed">
+    <div class="item" style="grid-row: autofoo / end" data-offset-y="100" data-offset-x="0" data-expected-height="95" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixed gap">
+    <div class="item" style="grid-row: 1 / span 4"  data-offset-y="0" data-offset-x="0" data-expected-height="195" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridAutoRepeatAndFixed gap">
+    <div class="item" style="grid-row: autobar / -1"  data-offset-y="175" data-offset-x="0" data-expected-height="20" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames">
+    <div class="item" style="grid-row: 1 / -1"  data-offset-y="0" data-offset-x="0" data-expected-height="200" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames">
+    <div class="item" style="grid-row: foo 3 / 4 bar"  data-offset-y="160" data-offset-x="0" data-expected-height="40" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames">
+    <div class="item" style="grid-row: -6 / span 2 start"  data-offset-y="20" data-offset-x="0" data-expected-height="140" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames gap">
+    <div class="item" style="grid-row: -4 / -2"  data-offset-y="40" data-offset-x="0" data-expected-height="140" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames gap">
+    <div class="item" style="grid-row: bar / foo 2"  data-offset-y="160" data-offset-x="0" data-expected-height="20" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleNames gap">
+    <div class="item" style="grid-row: foo / bar 2"  data-offset-y="40" data-offset-x="0" data-expected-height="180" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleTracks">
+    <div class="item" style="grid-row: a / 2 c"  data-offset-y="20" data-offset-x="0" data-expected-height="84" data-expected-width="25"></div>
+    <div class="item" style="grid-row: 3 / e; grid-column: 2;"  data-offset-y="52" data-offset-x="25" data-expected-height="72" data-expected-width="25"></div>
+</div>
+
+<div class="grid gridMultipleTracks gap">
+    <div class="item" style="grid-row: a / c"  data-offset-y="40" data-offset-x="0" data-expected-height="32" data-expected-width="25"></div>
+    <div class="item" style="grid-row: 3 / last; grid-column: 2;"  data-offset-y="92" data-offset-x="25" data-expected-height="115" data-expected-width="25"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/image-orientation-from-image-content-images-ref.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/image-orientation-from-image-content-images-ref.html
new file mode 100644
index 00000000000..c0d29909f90
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/image-orientation-from-image-content-images-ref.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Images Module Level 3: image-orientation: from-image for content images</title>
+<link rel="author" title="Stephen Chenney" href="mailto:schenney@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-images-3/#propdef-image-orientation">
+<style>
+    div.image {
+        display: inline-block;
+    }
+    div.container {
+        display: inline-block;
+        width: 100px;
+        vertical-align: top;
+    }
+    img {
+        width: 100px;
+        height: 100px;
+        background-repeat: no-repeat;
+    }
+    body {
+        overflow: hidden;
+    }
+</style>
+</head>
+<body >
+    <p>The images should rotate respecting their EXIF orientation because
+       image-orientation: from-image is specified.
+    </p>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-1-ul-pre-rotated.jpg)"></div>
+        <br>Normal
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-2-ur-pre-rotated.jpg)"></div>
+        <br>Flipped horizontally
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-3-lr-pre-rotated.jpg)"></div>
+        <br>Rotated 180&deg;
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-4-lol-pre-rotated.jpg)"></div>
+        <br>Flipped vertically
+    </div>
+    <br>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-5-lu-pre-rotated.jpg)"></div>
+        <br>Rotated 90&deg; CCW and flipped vertically
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-6-ru-pre-rotated.jpg)"></div>
+        <br>Rotated 90&deg; CW
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-7-rl-pre-rotated.jpg)"></div>
+        <br>Rotated 90&deg; CW and flipped vertically
+    </div>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-8-llo-pre-rotated.jpg)"></div>
+        <br>Rotated 90&deg; CCW
+    </div>
+    <br>
+    <div class="container">
+        <img style="background-image: url(../support/exif-orientation-5-lu-pre-rotated.jpg)"></img>
+        <br>Rotated 90&deg; CCW and flipped vertically
+    </div>
+    <div class="container">
+        <img style="background-image: url(../support/exif-orientation-6-ru-pre-rotated.jpg)"></img>
+        <br>Rotated 90&deg; CW
+    </div>
+    <div class="container">
+        <img style="background-image: url(../support/exif-orientation-7-rl-pre-rotated.jpg)"></img>
+        <br>Rotated 90&deg; CW and flipped vertically
+    </div>
+    <div class="container">
+        <img style="background-image: url(../support/exif-orientation-8-llo-pre-rotated.jpg)"></img>
+        <br>Rotated 90&deg; CCW
+    </div>
+    <br>
+    <div class="container">
+        <div class="image" style="content: url(../support/exif-orientation-9-u-pre-rotated.jpg)"></div>
+        <br>Undefined (invalid value)
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/masonry-item-placement-006.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/masonry-item-placement-006.html
new file mode 100644
index 00000000000..0082d72df26
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/masonry-item-placement-006.html
@@ -0,0 +1,149 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: Masonry item placement</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
+  <link rel="match" href="masonry-item-placement-006-ref.html">
+  <style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+grid {
+  display: inline-grid;
+  gap: 1px 2px;
+  grid-template-columns: repeat(4,20px);
+  grid-template-rows: masonry;
+  color: #444;
+  border: 1px solid;
+  padding: 2px;
+}
+
+item {
+  background-color: #444;
+  color: #fff;
+}
+.next > grid {
+  masonry-auto-flow: next;
+}
+</style>
+</head>
+<body>
+
+<grid>
+  <item style="padding-top:30px">1</item>
+  <item>2</item>
+  <item>3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item>3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item style="padding-top:30px">1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 2">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 3">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 4">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<span class="next">
+<grid>
+  <item style="padding-top:30px">1</item>
+  <item>2</item>
+  <item>3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item>3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item style="padding-top:30px">1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item>4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 2">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 3">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item style="padding-top:30px">2</item>
+  <item style="padding-top:10px">3</item>
+  <item style="grid-column:span 4">4</item>
+  <item>5</item>
+  <item>6</item>
+</grid>
+</span>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/moz-css21-table-page-break-inside-avoid-2.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/moz-css21-table-page-break-inside-avoid-2.html
new file mode 100644
index 00000000000..cc6a55933f6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/moz-css21-table-page-break-inside-avoid-2.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html lang="en-US" class="reftest-paged">
+<head>
+  <title>CSS Test: CSS 2.1 page-break-inside:avoid</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=685012">
+  <link rel="help" href="http://www.w3.org/TR/CSS21/page.html#propdef-page-break-inside">
+  <link rel="match" href="moz-css21-table-page-break-inside-avoid-2-ref.html">
+  <meta name="flags" content="paged">
+<style type="text/css">
+@page { size:5in 3in; margin:0.5in; }
+p { height: 1in; width: 1in; margin:0; background-color:blue; }
+.test { page-break-inside:avoid; }
+</style>
+</head>
+<body>
+<table border="1">
+<tbody>
+<tr><td><p>1</p></td></tr>
+</tbody>
+</table>
+<div style= "page-break-after: always"></div>
+<table border="1" class="test">
+<tbody></tbody>
+<tbody>
+<tr><td><p>2</p><p>3</p></td></tr>
+</tbody>
+</table>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/position-sticky-table-th-bottom-ref.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/position-sticky-table-th-bottom-ref.html
new file mode 100644
index 00000000000..2aa5c08a55d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/position-sticky-table-th-bottom-ref.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<title>Reference for position:sticky bottom constraint should behave correctly for &lt;th&gt; elements</title>
+
+<style>
+.group {
+  display: inline-block;
+  position: relative;
+  width: 150px;
+  height: 200px;
+}
+
+.scroller {
+  position: relative;
+  width: 100px;
+  height: 150px;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+.contents {
+  height: 550px;
+}
+
+.indicator {
+  position: absolute;
+  background-color: green;
+  left: 0;
+  height: 50px;
+  width: 50px;
+}
+</style>
+
+<script>
+window.addEventListener('load', function() {
+  document.getElementById('scroller1').scrollTop = 0;
+  document.getElementById('scroller2').scrollTop = 75;
+  document.getElementById('scroller3').scrollTop = 200;
+});
+</script>
+
+<div class="group">
+  <div id="scroller1" class="scroller">
+    <div class="indicator" style="top: 100px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller2" class="scroller">
+    <div class="indicator" style="top: 150px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>
+
+<div class="group">
+  <div id="scroller3" class="scroller">
+    <div class="indicator" style="top: 250px;"></div>
+    <div class="contents"></div>
+  </div>
+</div>
+
+<div>You should see three green boxes above. No red should be visible.</div>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/pre-float-001.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/pre-float-001.html
new file mode 100644
index 00000000000..8dd08d80992
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/pre-float-001.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>CSS test preserved spaces and floats interaction</title>
+<link rel="author" title="Koji Ishii" href="kojii@chromium.org">
+<link rel="match" href="reference/pre-float-001-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+html {
+  font-family: Ahem;
+  font-size: 20px;
+  line-height: 1;
+}
+.container {
+  white-space: pre;
+  width: 10ch;
+  margin-bottom: 1em;
+}
+.float {
+  float: left;
+  width: 3ch;
+  height: 2em;
+  background: orange;
+}
+</style>
+<body>
+  <div class="float"></div>
+  <div class="container">123456 <br>123456</div>
+  <div class="float"></div>
+  <div class="container">1234567 <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567  <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567   <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">12345678 <br>12345678</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/resize-004.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/resize-004.html
new file mode 100644
index 00000000000..3a1f5617493
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/resize-004.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: resize initial value - none</title>
+<link rel="author" title="Intel" href="http://www.intel.com/">
+<link rel="author" title="Shiyou Tan" href="mailto:shiyoux.tan@intel.com">
+<link rel="help" title="8.1. 'resize' property" href="http://www.w3.org/TR/css3-ui/#resize">
+<meta name="flags" content="interact">
+<meta name="assert" content="Test checks that the resize property initial value is none">
+<style>
+  #test {
+    border: 2px solid blue;
+    height: 100px;
+    overflow: auto;
+    width: 100px;
+  }
+</style>
+<body>
+  <p>Test passes if <strong>neither</strong> the height <strong>nor</strong> the width of the blue border square can be adjusted(for instance by dragging the bottom-right corner).</p>
+  <div id="test"></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/test-plan.src.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/test-plan.src.html
new file mode 100644
index 00000000000..c29f268837d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/test-plan.src.html
@@ -0,0 +1,1616 @@
+
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Compositing and Blending Test Plan</title>
+		<meta charset='utf-8'>
+		<script src='http://www.w3.org/Tools/respec/respec-w3c-common'
+						async class='remove'></script>
+		<script class='remove'>
+			var respecConfig = {
+					specStatus: "unofficial",
+					shortName:  "compositing-1-test-plan",
+					editors: [
+								{
+									name: "Mirela Budaes",
+									company: "Adobe Systems, Inc.",
+									companyURL: "http://www.adobe.com/"
+								},
+								{
+									name: "Horia Olaru",
+									company: "Adobe Systems, Inc.",
+									companyURL: "http://www.adobe.com/"
+								},
+								{
+									name: "Mihai Tica",
+									company: "Adobe Systems, Inc.",
+									companyURL: "http://www.adobe.com/"
+								},
+
+					]
+			};
+		</script>
+		<style>
+			table
+			{
+				border-collapse:collapse;
+			}
+			table, td, th
+			{
+				border:1px solid black;
+				padding: 13px;
+			}
+			table
+			{
+				width: 100%;
+			}
+			img
+			{
+				width: 400px;
+			}
+		</style>
+	</head>
+	<body>
+		<section id='abstract'>
+			<p>
+				This document is intended to be used as a guideline for the testing
+				activities related to the Compositing and Blending spec [[!compositing-1]]. Its main
+				goal is to provide an overview of the general testing areas and an informative
+				description of possible test cases.
+			</p>
+			<p>
+				This document is not meant to replace the spec in determining the
+				normative and non-normative assertions to be tested, but rather
+				complement it.
+			</p>
+		</section>
+		<section>
+			<h2>Goals</h2>
+			<section>
+				<h3>Providing guidance on testing</h3>
+				<p>
+					In order to increase the quality of the test contributions, this
+					document offers a set of test cases description for conducting testing (see
+					<a href="#test-cases-description" class="sectionRef"></a>).
+				</p>
+			</section>
+			<section>
+				<h3>Creating automation-friendly tests</h3>
+				<p>
+					In terms of actual tests produced for the CSS Compositing and Blending, the main goal
+					is to ensure that most tests are automatable (i.e. they're either
+					reftests or use <code>testharness.js</code>). Even where manual tests
+					are absolutely necessary they should be written so that they can be
+					easily automated &ndash; as there are on-going efforts to make
+					WebDriver [[webdriver]] automated tests a first class citizen in W3C
+					testing. This means that even if a manual test requires user
+					interaction, the validation or PASS/FAIL conditions should still be
+					clear enough as to allow automatic validation if said interaction is
+					later automated.
+				</p>
+			</section>
+		</section>
+		<section>
+			<h2>Approach</h2>
+			<p>
+				Since CSS blending has only three new CSS properties,
+				the approach is to deep dive into every aspect of the spec as much as possible.
+
+				Tests will be created for the testing areas listed in <a href="#testig-areas" class="sectionRef"></a>
+				and having as guidance the test cases description from <a href="#test-cases-description" class="sectionRef"></a>.
+			</p>
+		</section>
+		<section>
+			<h2>Testing areas</h2>
+			<section>
+				<h3>Explicit testing areas</h3>
+					<p>
+					  These testing areas cover things explicitly defined in the normative sections of the Blending and Compositing spec. Please note that while detailed, this list is not necessarily
+					  exhaustive and some normative behaviors may not be contained in it.
+					  When in doubt, consult the Blending and Compositing spec or ask a question on the
+					  <a href="http://lists.w3.org/Archives/Public/www-style/">mailing
+					  list</a>.
+					</p>
+				<p>Below is the list of explicit testing areas:</p>
+				<ol>
+					<li>Proper parsing of the CSS properties and rendering according to the spec
+						<ul><code>mix-blend-mode</code></ul>
+						<ul><code>isolation</code></ul>
+						<ul><code>background-blend-mode</code></ul>
+					</li>
+					<li>SVG blending</li>
+					<li>Canvas 2D blending</li>
+				</ol>
+			</section>
+			<section>
+				<h3>Implicit testing areas</h3>
+				<p>
+				  These are testing areas either normatively defined in other specs
+				  that explicitly refer to the Blending and Compositing spec (e.g. [[!css3-transforms]])
+				  or simply not explicitly defined, but implied by various aspects of
+				  the spec (e.g. processing model, CSS 2.1 compliance, etc.).
+				  Please note that while detailed, this list is not necessarily
+				  exhaustive and some normative behaviors may not be contained in it.
+				  When in doubt, consult the Blending and Compositing spec or ask a question on the
+				  <a href="http://lists.w3.org/Archives/Public/www-style/">mailing
+				  list</a>.
+				</p>
+				<p>Below is the list of implicit testing areas:</p>
+				<ol>
+					<li>Blending different types of elements
+						<ul>
+							<li><code>&lt;video&gt;</code></li>
+							<li><code>&lt;canvas&gt;</code></li>
+							<li><code>&lt;table&gt;</code></li>
+							</ul>
+					</li>
+					<li>Blending elements with specific style rules applied
+						<ul>
+							<li><code>transforms</code></li>
+							<li><code>transitions</code> </li>
+							<li><code>animations</code> </li>
+						</ul>
+					</li>
+				</ol>
+			</section>
+		</section>
+		<section>
+				<h2>Test cases description</h2>
+				<section>
+					<h3>Test cases for <code>mix-blend-mode</code></h3>
+					<p>
+						The following diagram describes a list of notations to be used later on in the document as well as the general document structure the test cases will follow. The test cases should not be limited to this structure. This should be a wireframe and people are encouraged to come up with complex test cases as well.
+					</p>
+					<p>
+						<img id="test_outline" src="test_template.png" alt="Mix-blend-mode sample elements">
+					</p>
+					<p>The intended structure of the document is the following:</p>
+						<pre>
+&lt;body&gt;
+  &lt;div id="[P]"&gt;
+    &lt;div id="[IN-S]"&gt;&lt;/div&gt;
+    &lt;div id="[IN-P]"&gt;
+      &lt;div id="[B]"&gt;
+        &lt;div id="[CB]"&gt;&lt;/div&gt;
+      &lt;/div&gt;
+    &lt;/div&gt;
+  &lt;/div&gt;
+&lt;/body&gt;
+						</pre>
+					<p> Unless otherwise stated, test cases assume the following properties for the elements: <br>
+						<ul>
+						<li> default value for the <code>background-color</code> of the <code>body</code></li>
+						<li> <code>background-color</code> set to a fully opaque color for all the other elements </li>
+						</ul>
+					</p>
+					<p>The CSS associated to the elements used in the tests shouldn't use properties that creates a stacking context, except the ones specified in the test case descriptions.</p>
+					<p>Every test case has a description of the elements used. The notation from the image is used in the test case description too (e.g. for parent element the notation is [P]). Each test case uses only a subset of the elements while the other elements should just be removed.
+					</p></p>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> other than normal creates a stacking context</h4>
+						<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a>: <q>Applying a blendmode other than �normal’ to the element must establish a new stacking context [CSS21].</q></p>
+						<table>
+							<tr>
+								<th>Test name</th>
+								<th>Elements and styles</th>
+								<th>Expected result</th>
+							</tr>
+							<tr>
+								<td>Simple <code>&lt;div&gt;</td>
+								<td>1 element required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal
+								 </td>
+								<td>The element [B] creates a stacking context</td>
+							</tr>
+						</table>
+					</section>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> blends with the content within the current stacking context</h4>
+						<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q>An element that has blending applied, must blend with all the underlying content of the stacking context [CSS21] that that element belongs to.</q> </p>
+						<table>
+							<tr>
+								<th>Test name</th>
+								<th>Elements and styles</th>
+								<th>Expected result</th>
+							</tr>
+							<tr>
+								<td>Blending simple elements </td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and  <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal
+								</td>
+								<td>The color of the parent element [P] mixes with the color of the child element [B].</td>
+							</tr>
+							<tr>
+								<td>Blending <code>&lt;video&gt;</code></td>
+								<td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+									[B] - <code>&lt;video&gt;</code> element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-S] - sibling(of the element [B]) visually overlaping the <code>&lt;video&gt;</code> element <br>
+									[IN-S] has some text inside
+							</td>
+								<td>The content of the <code>video</code> element [B] mixes with the colors of the sibling element and the text from [IN-S].</td>
+							</tr>
+							<tr>
+								<td>Blending with a sibling</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-S] - sibling of the element [B] <br>
+									The [IN-S] element visually overlaps the [B] element
+								</td>
+								<td>The colors of the parent element [P] and the sibling element [IN-S] mixes with the color of the blended element [B].</td>
+							</tr>
+							<tr>
+								<td>Blending with two levels of ascendants</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="child of the element [P]">[IN-P]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-P] - Intermediate child element between the parent [P] and the child [B]
+								</td>
+								<td>The colors of the parent element [P] and the child element [IN-P] mixes with the color of the blended element [B].</td>
+							</tr>
+						</table>
+					</section>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> doesn't blend with anything outside the current stacking context</h4>
+						<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q> An element that has blending applied, must blend with all the underlying content of the stacking context [CSS21] that that element belongs to.</q></p>
+						<table>
+							<tr>
+								<th>Test name</th>
+								<th>Elements and styles</th>
+								<th>Expected result</th>
+							</tr>
+							<tr>
+								<td>Blending child overflows the parent</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									The blending element [B] has content that lies outside the parent element. <br>
+									Set the <code>background-color</code> of the <code>body</code> to a value other than default</td>
+								<td>The color of the parent element mixes with the color of the child element. <br>
+									 The area of the child element outside of the parent element doesn't mix with the color of the <code>body</code></td>
+							</tr>
+							<tr>
+								<td>Parent with transparent pixels</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									The element has some text inside and default value for <code>background-color</code> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									The <code>background-color</code> of the <code>body</code> has a value other than default</td>
+								<td>The color of the text from the parent element [P] mixes with the color of the child element [B]. <br>
+								No blending between the color of the <code>body</code> and the color of the blending element [B].
+								 </td>
+							</tr>
+							<tr>
+								<td>Parent with <code>border-radius</code></td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+										[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+										[P] has <code>border-radius</code> specified (e.g.50%). <br>
+										[B] - element with <code>mix-blend-mode</code> other than normal <br>
+										[B] has content that lies outside the parent element, over a rounded corner. <br>
+										The <code>background-color</code> of the <code>body</code> has a value other than default. </td>
+								<td>The color of the parent element mixes with the color of the child element. <br>
+									 The area of the child element which draws over the rounded corner doesn't mix with the color of the <code>body</code></td>
+							</tr>
+						</table>
+					</section>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> other than normal must cause a group to be isolated</h4>
+						<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#isolation" >spec</a>: <q>operations that cause the creation of stacking context [CSS21] must cause a group to be isolated.</q> </p>
+						<table>
+							<tr>
+								<th>Test name</th>
+								<th>Elements and styles</th>
+								<th>Expected result</th>
+							</tr>
+							<tr>
+								<td>Child of the blended element has opacity</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									[CB] - child of the element [B] with <code>opacity</code> less than one. </td>
+								<td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br>
+								No blending between [B] and [CB]</td>
+							</tr>
+							<tr>
+								<td>Overflowed child of the blended element</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+										[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+										[B] - element with <code>mix-blend-mode</code> other than normal <br>
+										[CB] - child of the element [B] with content that lies outside the parent element [B].
+								</td>
+								<td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br>
+								No blending between [B] and [CB]. There is only one color for the entire element [CB] </td>
+							</tr>
+							<tr>
+								<td>Blended element with transparent pixels</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal and transparent <code>background-color</code> <br>
+									[CB] - child of the element [B]
+								</td>
+								<td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br>
+								No blending between [B] and [CB]. </td>
+							</tr>
+						</table>
+					</section>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> must work properly with css transforms</h4>
+						<table>
+							<tr>
+								<th>Test name</th>
+								<th>Elements and styles</th>
+								<th>Expected result</th>
+							</tr>
+							<tr>
+								<td>Parent with 3D transform</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and  <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with <code>3D transform</code> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal
+								<td>The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The element (and the content) of the element [P] is properly transformed
+								</td>
+							</tr>
+							<tr>
+								<td>Blended element with 3D transform</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal and <code>3D transform</code> <br>
+									[CB] - child of the element [B] </td>
+								<td> The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The element (and the content) of the element [P] is properly transformed </td>
+							</tr>
+							<tr>
+								<td>Both parent and blended element with 3D transform</td>
+								<td> 2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and  <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with <code>3D transform</code> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal and <code>3D transform</code>
+								</td>
+								<td>The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The elements (and the content) of the elements [P]  and [B] are properly transformed</td>
+							</tr>
+							<tr>
+								<td>Blended element with transform and preserve-3d</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+										[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+										[B] - element with <code>mix-blend-mode</code> other than normal and transform with <code>transform-style:preserve-3d</code> <br>
+										[CB] - child of the element [B]. It has 3D transform property</td>
+								<td> The child element [CB] will NOT preserve its 3D position. <br>
+								<code>mix-blend-mode</code> override the behavior of <code>transform-style:preserve-3d</code>:
+								creates a flattened representation of the descendant elements <br>
+								The color of the group created by the child elements([B] and [CB]) will blend with the color of the parent element [P] </td>
+							</tr>
+							<tr>
+								<td>Blended element with transform and perspective</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+										[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+										[B] - element with <code>mix-blend-mode</code> other than normal and transform with <code>perspective</code> set to positive length </td>
+								<td>The colors of the parent and the child are mixed ([P] and [B]) <br>
+									The element (and the content) of the element [B] is properly transformed
+								</td>
+							</tr>
+							<tr>
+								<td>Sibling with 3D transform between the parent and the blended element</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-S] - Sibling(of the element [B]) with <code>3D transform</code> between the parent [P] and the child [B]
+									 </td>
+								<td>The colors of the parent element [P] and the transformed sibling element [IN-S] mixes with the color of the blended element [B].<br>
+								The element (and the content) of the element [IN-S] is properly transformed
+								</td>
+							</tr>
+							<tr>
+								<td>Parent with 3D transform and transition</td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and  <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with <code>3D transform</code> and transition <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal
+								<td>The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The element (and the content) of the element [P] is properly transformed
+								</td>
+							</tr>
+							<tr>
+								<td>Sibling with 3D transform(and transition) between the parent and the blended element</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-S] - sibling(of the element [B]) with <code>3D transform</code> and transition between the parent [P] and the child [B]
+									 </td>
+								<td>The colors of the parent element [P] and the transformed sibling element [IN-S] mixes with the color of the blended element [B].<br>
+								The element (and the content) of the element [IN-S] is properly transformed
+								</td>
+							</tr>
+						</table>
+					</section>
+					<section>
+						<h4>An element with <code>mix-blend-mode</code> must work properly with elements with <code>overflow</code> property</h4>
+						<table>
+							<tr>
+								<td>Parent element with <code>overflow:scroll</code> </td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[P] has <code>overflow:scroll</code> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal tat overflows the parents [P] dimensions so that it creates scrolling for the parent
+								<td>The color of the parent element [P] mixes with the color of the child element [B]. <br>
+									The scrolling mechanism is not affected.
+								</td>
+							</tr>
+							<tr>
+								<td>Blended element with <code>overflow:scroll</code></td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal, <code>overflow:scroll</code> and a child element that creates overflow for [B]</td>
+								<td>The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The scrolling mechanism is not affected.
+								</td>
+							</tr>
+							<tr>
+								<td>Parent element with <code>overflow:scroll</code> and blended with <code>position:fixed</code> </td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[P] has <code>overflow:scroll</code> <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal, <code>position:fixed</code> and should overflow the parents [P] dimensions so that it creates scrolling for the parent</td>
+								<td>The color of the parent element [P] mixes with the color of the child element [B] <br>
+									The blending happens when scrolling the content of the parent element [P] too. <br>
+									The scrolling mechanism is not affected.
+								</td>
+							</tr>
+							<tr>
+								<td>Parent with <code>overflow:hidden</code> and <code>border-radius</code></td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[P] has <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal with content that lies outside the parent element, over a rounded corner <br>
+									Set the <code>background-color</code> of the <code>body</code> to a value other than default.</td>
+								<td>The color of the parent element mixes with the color of the child element. <br>
+									The area of the child element which draws over the rounded corner is properly cut </td>
+							</tr>
+							<tr>
+								<td>Blended element with <code>overflow:hidden</code> and <code>border-radius</code></td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Child of the lement [B]">[CB]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal, <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%). <br>
+									[CB] - child of the element [B], with content that lies outside the parent element, over a rounded corner. <br> </td>
+								<td>The group created by the two child elements([B] and [CB]) is blended with the parent element [P]. <br>
+									No blending between [B] and [CB]. <br>
+									[CB] is properly clipped so no overflow is visible.</td>
+							</tr>
+							<tr>
+								<td>Intermediate child with <code>overflow:hidden</code> and <code>border-radius</code> between the parent and the blended element</td>
+								<td>3 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>, <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="child of the element [P]">[IN-P]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal that overflows the parents [IN-P] dimensions
+									[IN-P] - child(of the element [P]) with <code>overflow:hidden</code> and <code>border-radius</code> specified (e.g.50%)
+									 </td>
+								<td>The colors of the parent element [P] and the child element [IN-P] mixes with the color of the blended element [B]. <br>
+									[B] is is properly clipped so no overflow is visible
+								</td>
+							</tr>
+						</table>
+					</section>
+				<section>
+					<h4>Other test cases</h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Blended element with <code>border-image</code> </td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - element with <code>mix-blend-mode</code> other than normal and <code>border-image</code> specified as a png file
+							</td>
+							<td>The color of the parent element [P] mixes with the color of the child element. <br>
+								The color of the <code>border-image</code> mixes with the color of the parent element [P].
+							</td>
+						</tr>
+						<tr>
+							<td>Blending with <code>&lt;canvas&gt;</code> </td>
+							<td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+								[B] - <code>&lt;canvas&gt;</code> element with <code>mix-blend-mode</code> other than normal <br>
+								[IN-S] - Sibling of the <code>&lt;canvas&gt;</code> element with some text <br>
+								The [IN-S] element overlaps the <code>&lt;canvas&gt;</code> element
+							</td>
+							<td>The content of the <code>&lt;canvas&gt;</code> element mixes with the color of the sibling element and the text [IN-S].</td>
+						</tr>
+						<tr>
+							<td>Blended <code>&lt;canvas&gt;</code></td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - Child <code>&lt;canvas&gt;</code> element with <code>mix-blend-mode</code> other than normal
+							</td>
+							<td>The color of the <code>&lt;canvas&gt;</code> element [B] mixes with the color of the parent element [P] .</td>
+						</tr>
+						<tr>
+							<td>Blended <code>&lt;video&gt;</code></td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - <code>&lt;video&gt;</code> element with <code>mix-blend-mode</code> other than normal
+							</td>
+							<td>The color of the <code>&lt;video&gt;</code> element mixes with the color of the parent element [P] .</td>
+						</tr>
+						<tr>
+							<td>Blending with <code>&lt;iframe&gt;</code> </td>
+							<td>2 elements required: <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> and <a href="#test_outline" title="Sibling of the element [B]">[IN-S]</a> <br>
+									[B] - <code>&lt;iframe&gt;</code> element with <code>mix-blend-mode</code> other than normal <br>
+									[IN-S] - sibling(of the element [B]) with some text <br>
+									The [IN-S] element visually overlaps the <code>&lt;iframe&gt;</code> element
+							</td>
+							<td>The color of the <code>&lt;iframe&gt;</code> element mixes with the color of the sibling element and the text [IN-S].</td>
+						</tr>
+						<tr>
+							<td>Blended <code>&lt;iframe&gt;</code></td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - <code>&lt;iframe&gt;</code> element with <code>mix-blend-mode</code> other than normal
+							</td>
+							<td>The color of the <code>&lt;iframe&gt;</code> element [B] mixes with the color of the parent element [P]. </td>
+						</tr>
+						<tr>
+							<td>Blended element with <code>mask</code> property</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - element with <code>mix-blend-mode</code> other than normal and <code>mask</code> property specified to an SVG image (e.g. circle)</td>
+							<td>The colors of the parent and the masked child are mixed ([P] and [B])</td>
+						</tr>
+						<tr>
+							<td>Blended element with <code>clip-path</code> property </td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - element with <code>mix-blend-mode</code> other than normal and <code>clip-path</code> property specified to a basic shape (e.g. ellipse)</td>
+							<td>The colors of the parent and the clipped child are mixed ([P] and [B])</td>
+						</tr>
+						<tr>
+							<td>Blended element with <code>filter</code> property</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - element with <code>mix-blend-mode</code> other than normal and <code>filter</code> property value other than none </td>
+							<td>The filter is applied and the result is mixed with the parent element</td>
+						</tr>
+						<tr>
+							<td>Blended element with <code>transition</code></td>
+								<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+									[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+									[B] - element with <code>mix-blend-mode</code> other than normal and <code>transition-property</code> for <code>opacity</code> </td>
+							<td>The transition is applied and the result is mixed with the parent element</td>
+						</tr>
+							<tr>
+							<td>Blended element with <code>animation</code></td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - element with <code>mix-blend-mode</code> other than normal and <code>animation</code> specified</td>
+							<td>The animation is applied to the child element and the result is mixed with the parent element</td>
+						</tr>
+						<tr>
+							<td>Image element</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - <code>&lt;img&gt;</code> element (.jpeg or .gif image) with <code>mix-blend-mode</code> other than normal</td>
+							<td>The color of the <code>&lt;img&gt;</code> is mixed with the color of the <code>&lt;div&gt;</code>.</td>
+						</tr>
+						<tr>
+							<td>SVG element</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - SVG element with <code>mix-blend-mode</code> other than normal</td>
+							<td>The color of the SVG is mixed with the color of the <code>&lt;div&gt;</code>.</td>
+						</tr>
+						<tr>
+							<td>Paragraph element</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - paragraph element with <code>mix-blend-mode</code> other than normal</td>
+							<td>The color of the text from the paragraph element is mixed with the color of the <code>&lt;div&gt;</code></td>
+						</tr>
+						<tr>
+							<td>Paragraph element and background-image</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								 and  <code>background-image</code> <br>
+								[B] - Child <code>p</code> element with some text and <code>mix-blend-mode</code> other than normal</td>
+							<td>The color of the text from the <code>p</code> element is mixed with the background image of the <code>&lt;div&gt;</code>.</td>
+						</tr>
+						<tr>
+							<td>Set blending from JavaScript</td>
+							<td>2 elements required: <a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and <a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[B] - Child <code>&lt;div&gt;</code> element with no <code>mix-blend-mode</code> specified<br>
+								From JavaScript, set the <code>mix-blend-mode</code> property for the child <code>&lt;div&gt;</code> to a value other than normal</td>
+							<td>The colors of the <code>&lt;div&gt;</code> elements are mixed.</td>
+						</tr>
+					</table>
+				</section>
+			</section>
+			<section>
+				<h3>Test cases for SVG elements with <code>mix-blend-mode</code></h4>
+				<section>
+					<h4><code>mix-blend-mode</code> with simple SVG graphical elements</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a> : <q><code>mix-blend-mode</code> applies to svg, g, use, image, path, rect, circle, ellipse, line, polyline, polygon, text, tspan, and marker.</q></p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Circle with SVG background</td>
+							<td>Set a background color for the SVG.<br>
+								Create 16 <code>circle</code> elements and fill them with a solid color.
+								<br>Apply each <code>mix-blend-mode</code> on them.</td>
+							<td>The color of the <code>circle</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Ellipse with SVG background</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>ellipse</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>ellipse</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Image with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create an <code>image</code> element and apply a <code>mix-blend-mode</code> other than <code>normal</code>.</td>
+							<td>The <code>image</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Line with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>line</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>line</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Path with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>path</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>path</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Polygon with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>polygon</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>polygon</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Polyline with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>polyline</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>polyline</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Rect with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>rect</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> on it other than <code>normal</code>.</td>
+							<td>The color of the <code>rect</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Text with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>text</code> element and apply a <code>mix-blend-mode</code> other than <code>normal</code>.</td>
+							<td>The text is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Text having tspan with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>text</code> element and a <code>tspan</code> inside it.
+								<br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>tspan</code>.</td>
+							<td>The text is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Gradient with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>rect</code> element and fill it with a <code>gradient</code>.
+								<br>Apply a <code>mix-blend-mode</code> on it other than normal.</td>
+							<td>The gradient is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Pattern with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>rect</code> element and fill it with a <code>pattern</code>.
+								<br>Apply a <code>mix-blend-mode</code> on it other than normal.</td>
+							<td>The pattern is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Set blending on an element from JavaScript</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>rect</code> element and fill it with a solid color.
+								<br>Apply a <code>mix-blend-mode</code> (other than <code>normal</code>) on it from JavaScript.</td>
+							<td>The color of the <code>rect</code> is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Marker with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>line</code> element containing a marker.
+								<br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td>
+							<td>The marker color is mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>Metadata with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>metadata</code> element containing an embedded pdf.
+								<br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td>
+							<td>The metadata content is not mixed with the color of the background.</td>
+						</tr>
+						<tr>
+							<td>ForeignObject with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>foreignObject</code> element containing a simple xhtml file.
+								<br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the marker.</td>
+							<td>The foreignObject content is not mixed with the color of the background.</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>mix-blend-mode</code> with SVG groups</h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Group of overlapping elements with SVG background</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color.
+								<br>Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the group.</td>
+							<td>The <code>group</code> is mixed as a whole with the color of the background.</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>mix-blend-mode</code> with isolated groups</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode" >spec</a>:
+					<br><q>By default, every element must create a non-isolated group.<br>
+						However, certain operations in SVG will create isolated groups.<br>
+						If one of the following features is used, the group must become isolated:
+						<ul>
+						    <li>opacity</li>
+						    <li>filters</li>
+						    <li>3D transforms (2D transforms must NOT cause isolation)</li>
+						    <li>blending</li>
+						    <li>masking</li>
+						</ul>
+					</q>
+					</p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Blending two elements in an isolated group</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color.<br>
+								Apply <code>opacity</code> less than 1 on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the second rect.</td>
+							<td>Only the intersection of the <code>rect</code> elements should mix.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with opacity</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>opacity</code> less than 1 on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with filter</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>filter</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with 2D transform</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>transform</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with 3D transform</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply a 3d transform on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with a mask</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>mask</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with mix-blend-mode</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>mix-blend-mode</code> other than <code>normal</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>Other test cases for SVG</h4>
+					<table>
+						<tr>
+							<td>Blend with element having opacity</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>opacity</code> less than 1 and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with element having stroke</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>stroke</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with element having stroke-opacity</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>stroke</code>, <code>stroke-opacity</code> less than 1 and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with element having stroke-dasharray</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element filled with a different solid color.<br>
+								Apply a <code>stroke-dasharray</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with element having transform</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> element. Apply a <code>transform</code> (any combination of <code>translate</code>, <code>rotate</code>, <code>scale</code>, <code>skew</code>) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with SVG having viewbox and preserveAspectRatio set</td>
+							<td>Set a background color for the SVG, as well as <code>viewbox</code> and <code>preserveAspectRatio</code>.<br>
+								Create a <code>rect</code> element filled with a different solid color and apply a <code>mix-blend-mode</code> other than <code>normal</code> on it.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an element having color-profile set</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> element. Apply a <code>color-profile</code> (<code>sRGB</code>, for example) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an element having overflow</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> larger than the SVG.<br>
+								Apply <code>overflow</code> (<code>visible</code>, <code>hidden</code>, <code>scroll</code>) and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an element having clip-path</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> element. Apply a <code>clip-path</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an element having a mask</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> element.<br>
+								Apply a <code>mask</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an element having a filter</td>
+							<td>Set a background color for the SVG.<br>
+								Create an <code>image</code> element.<br>
+								Apply a <code>filter</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>image</code>.</td>
+							<td>The <code>image</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blend with an animated element</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element filled with a different solid color.<br>
+								Apply an <code>animateTransform</code> and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Set blending from an SVG script element</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>rect</code> element and fill it with a solid color.<br>
+								Apply a <code>mix-blend-mode</code> (other than <code>normal</code>) on it from an svg <code>script</code> element.</td>
+							<td>The <code>rect</code> will mix with the content behind it.</td>
+						</tr>
+					</table>
+				</section>
+			</section>
+			<section>
+				<h3>Test cases for <code>background-blend-mode</code></h3>
+				<section>
+					<h4>Blending between the background layers and the background color for an element with <code>background-blend-mode</code> </h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>Each background layer must blend with the element's background layer that are below it and the element's background color.</q></p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Images with different formats</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+								Tests should be created for <code>&lt;image&gt;</code> with different formats such as PNG, JPEG or SVG
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td>
+						</tr>
+						<tr>
+							<td>Gradient and background color</td>
+							<td>
+								Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;gradient&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td>
+						</tr>
+						<tr>
+							<td>Image and gradient</td>
+							<td>
+								Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code> on top of a <code>&lt;gradient&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>&lt;image&gt;</code> is mixed with the content of the <code>&lt;gradient&gt;</code>
+							</td>
+						</tr>
+						<tr>
+							<td>Gradient and image</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to a <code>&lt;gradient&gt;</code> on top of an <code>&lt;image&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>&lt;image&gt;</code> is mixed with the content of the <code>&lt;gradient&gt;</code></td>
+						</tr>
+						<tr>
+							<td>Two gradients</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to a <code>&lt;gradient&gt;</code> on top of another <code>&lt;gradient&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul></td>
+							<td>The content of the two gradients is mixed</td>
+						</tr>
+						<tr>
+							<td>Two images</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code> on top of another <code>&lt;image&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul></td>
+							<td>The content of the two images is mixed</td>
+						</tr>
+						<tr>
+							<td>Image and background color with transparency</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code> with transparency(e.g. PNG images)</li>
+									<li><code>background-color</code> set to a transparent color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code></td>
+						</tr>
+						<tr>
+							<td>Cross-fade image and gradient</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to a <q>cross-fade()</q> image on top of a <code>&lt;gradient&gt;</code> </li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the cross-faded image is mixed with the content of the <code>&lt;gradient&gt;</code></td>
+						</tr>
+						<tr>
+							<td>SVG image and background color</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to a data URI for an SVG image </li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the image is mixed with the color of the background</td>
+						</tr>
+						<tr>
+							<td>Animated gif image and background color</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an animated gif image</li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the image is mixed with the color of the background</td>
+						</tr>
+						<tr>
+							<td>Set <code>background-blend-mode</code> from JavaScript</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to a <code>gradient</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li>no <code>background-blend-mode</code> explicitly specified</li>
+									From JavaScript, set the <code>background-blend-mode</code> property to a value other than normal.
+								</ul>
+							</td>
+							<td>The content of the gradient is mixed with the color of the background</td>
+						</tr>
+						<tr>
+							<td><code>background-blend-mode</code> on element with 3D transform</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+									<li><code>transform</code> set to a 3D function like rotateX, rotateY or translateZ</li>
+								</ul>
+							</td>
+							<td>The content of the image is mixed with the color of the background</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>Background layers do not blend with content outside the background (or behind the element)</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>Background layer must not blend with the content that is behind the element instead they must act as if they are rendered into an isolated group.</q>
+					</p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>One background layer</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The <code>background-image</code> is not mixed with anything outside the element</td>
+						</tr>
+						<tr>
+							<td>Two elements</td>
+							<td>2 elements required: a parent element with a child. <br>
+								Each one with the following properties:
+								<ul>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							<td>No blending between the background colors of the two elements</td>
+						</tr>
+						<tr>
+							<td>Parent and child with <code>background-blend-mode</code></td>
+							<td>2 elements required: a parent element with a child <br>
+								Parent properties: <br>
+								<ul>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+								Child properties: <br>
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							<td>The content of the image from the child element does not mixes with the background color from the parent element</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4> <code>background-blend-mode</code> list values apply to the corresponding background layer</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>The �background-blend-mode’ list must be applied in the same order as �background-image’[CSS3BG]. This means that the first element in the list will apply to the layer that is on top.</q>
+					</p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Different blend modes applied between layers</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image-list&gt;</code> containing three images: (e.g. I1, I2 and I3 ) </li>
+									<li><code>background-blend-mode</code> set to different <code>blendmode</code> for every image: (e.g. multiply, difference, screen) </li>
+								</ul></td>
+							<td>The content of the three images is correctly mixed <br>
+							(multiply for I1, difference for I2 and screen for I3)
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> list values are repeated if the list is shorter than the background layer list</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>If a property doesn't have enough comma-separated values to match the number of layers, the UA must calculate its used value by repeating the list of values until there are enough.</q>
+					</p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Blend mode list repeat</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image-list&gt;</code> containing three images</li>
+									<li><code>background-blend-mode</code> set to two different <code>blendmode</code> values</li>
+								</ul></td>
+							<td>The unspecified blend modes should be obtained by repeating the blend mode list from the beginning</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>The default <code>background-blend-mode</code> value for the <code>background</code> shorthand is 'normal' </h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#background-blend-mode">spec</a>: <q>If the �background’ [CSS3BG] shorthand is used, the �background-blend-mode’ property for that element must be reset to its initial value.</q>
+					</p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Default blend mode for 'background' shorthand</td>
+							<td>Element with
+								<ul>
+									<li><code>background</code> property set to an image and a color</li>
+									<li>No value explicitly set for <code>background-blend-mode</code> </li>
+								</ul></td>
+							<td> The computed value of <code>background-blend-mode</code> is 'normal'
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-position</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td><code>background-position</code> percentage</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-position</code> specified in percentage, such as 50% 50%</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> is correctly positioned
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-size</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Background size defined in pixels</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-size</code> specified in pixels</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> has the correct size
+							</td>
+						</tr>
+						<tr>
+							<td>Background size defined in percentage (second phase)</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-size</code> specified in percentage</li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> has the correct size
+							</td>
+						</tr>
+						<tr>
+							<td>Background size cover</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-size</code> set to <code>cover</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> has the correct size
+							</td>
+						</tr>
+						<tr>
+							<td>Background size contain</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-size</code> set to <code>contain</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> has the correct size
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-repeat</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td><code>background-repeat</code> set to no-repeat</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-repeat</code> set to <code>no-repeat</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The <code>background-image</code> is not repeated
+							</td>
+						</tr>
+						<tr>
+							<td><code>background-repeat</code> set to space</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-repeat</code> set to <code>space</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							</td>
+						</tr>
+						<tr>
+							<td><code>background-repeat</code> set to round</td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-repeat</code> set to <code>round</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-clip</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td><code>background-clip</code> set to <code>padding-box</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-clip</code> set to <code>padding-box</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							No background is drawn below the border (background extends to the outside edge of the padding)
+							</td>
+						</tr>
+						<tr>
+							<td><code>background-clip</code> set to <code>content-box</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-clip</code> set to <code>content-box</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The background is painted within (clipped to) the content box
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-origin</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td><code>background-origin</code> set to <code>border-box</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-origin</code> set to <code>border-box</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The background extends to the outside edge of the border (but underneath the border in z-ordering)
+							</td>
+						</tr>
+						<tr>
+							<td><code>background-origin</code> set to <code>content-box</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-origin</code> set to <code>content-box</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The background is painted within (clipped to) the content box
+							</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4><code>background-blend-mode</code> for an element with <code>background-attachement</code></h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td><code>background-attachment</code> set to <code>fixed</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to an <code>&lt;image&gt;</code></li>
+									<li><code>background-color</code> set to a fully opaque color</li>
+									<li><code>background-attachment</code> set to <code>fixed</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The content of the <code>background-image</code> is mixed with the color of the <code>background-color</code> <br>
+							The background image will not scroll with its containing element, instead remaining stationary within the viewport
+							</td>
+						</tr>
+						<tr>
+							<td>2 background images with <code>background-attachment</code> set to <code>fixed, scroll</code></td>
+							<td>Element with
+								<ul>
+									<li><code>background-image</code> set to 2 <code>&lt;image&gt;</code>(s)</li>
+									<li><code>background-attachment</code> set to <code>fixed, scroll</code></li>
+									<li><code>background-blend-mode</code> other than normal</li>
+								</ul>
+							</td>
+							<td>The background images will be mixed when they overlap while scrolling
+							</td>
+						</tr>
+					</table>
+				</section>
+		</section>
+			<section>
+				<h3>Test cases for <code>isolation</code></h3>
+				<section>
+					<h4>An element with <code>isolation:isolate</code> creates a stacking context</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#csscompositingrules_CSS">spec</a>: <q>For CSS, setting �isolation’ to �isolate’ will turn the element into a stacking context [CSS21].</q></p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Isolation isolate</td>
+							<td>Have an element with <code>isolation</code> set to <code>isolate</code></td>
+							<td>The element creates a stacking context.</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>An element with <code>isolation:isolate</code> creates an isolated group for blended children</h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Isolation of blended child which overflows</td>
+							<td>3 elements required:
+								<a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>,
+								<a href="#test_outline" title="child of the element [P]">[IN-P]</a> and
+								<a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>) <br>
+								[IN-P] - Intermediate child element between the parent [P] and the child [B]<br>
+								This element has <code>isolation:isolate</code> set.<br>
+								[B] - element with <code>mix-blend-mode</code> other than <code>normal</code> <br>
+								The blending element [B] has content that lies outside the parent element. <br>
+							</td>
+							<td>
+								The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br>
+								The area of the child element outside of the intermediate parent element does not mix with the color of the parent element [P], or of the <code>body</code>.
+							</td>
+						</tr>
+						<tr>
+							<td>Isolation on intermediate element with transparent pixels</td>
+							<td>3 elements required:
+								<a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>,
+								<a href="#test_outline" title="child of the element [P]">[IN-P]</a> and
+								<a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>); the element <code>background-color</code> is other than <code>transparent</code><br>
+								[IN-P] - Intermediate child element between the parent [P] and the child [B]<br>
+								The intermediate element has text content, default value for <code>background-color</code> and <code>isolation:isolate</code> set<br>
+								[B] - element with <code>mix-blend-mode</code> other than <code>normal</d <br>
+							<td>
+								The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br>
+								There is no blending between the color of the parent element [P] and the color of the blended element [B].
+							</td>
+						</tr>
+						<tr>
+							<td>Isolate inside a stacking context created by a 3d transform</td>
+							<td>
+								3 elements required:
+								<a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a>,
+								<a href="#test_outline" title="child of the element [P]">[IN-P]</a> and
+								<a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a <code>3D transform</code> applied<br>
+								[IN-P] - Intermediate child element between the parent [P] and the child [B]<br>
+								The intermediate element has <code>isolation:isolate</code> set<br>
+								[B] - element with <code>mix-blend-mode</code> other than <code>normal</code><br>
+							</td>
+							<td>
+								The color of the child element [B] mixes with the color of the intermediate element [IN-P], where they overlap.<br>
+								There is no blending between the color of the parent element [P] and the color of the blended element [B].
+							 </td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>An element with <code>isolation:auto</code> set does not change the elements existing stacking context behavior</h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Isolation auto</td>
+							<td>Have an element with <code>isolation</code> explicitly set to <code>auto</code>, and no other style that would create a stacking context</td>
+							<td>The element does not create a stacking context - the computed value of its <code>z-index</code> is value <code>auto</code></td>
+						</tr>
+						<tr>
+							<td>Stacking context not affected by isolation</td>
+							<td>2 elements required:
+								<a href="#test_outline" title="parent element with a property that creates stacking context">[P]</a> and
+								<a href="#test_outline" title="Element with mix-blend-mode property other than normal">[B]</a> <br>
+								[P] - parent element with a property that creates a stacking context (e.g. <code>position:fixed</code>); This element has <code>isolation</code> explicitly set to <code>auto</code> <br>
+								[B] - element with <code>mix-blend-mode</code> other than <code>normal</code> <br>
+								The blending element [B] has content that lies outside the parent element. <br>
+								Set the <code>background-color</code> of the <code>body</code> to a value other than default
+							</td>
+							<td>The color of the parent element mixes with the color of the child element. <br>
+								The area of the child element outside of the parent element doesn't mix with the color of the <code>body</code>.<br>
+								In other words, setting the <code>isolation</code> to <code>auto</code> does not affect the creation of a stacking context by other properties.
+							</td>
+						</tr>
+					</table>
+				</section>
+			</section>
+			<section>
+				<h4>Test cases for <code>isolation</code> in SVG</h4>
+				<section>
+					<h4>In SVG, an element with <code>isolation:isolate</code> creates an isolated group for blended children</h4>
+					<p>Refers to the following assertion in the <a href="https://drafts.fxtf.org/compositing-1/#isolation">spec</a>: <q>In SVG, this defines whether an element is isolated or not.</q></p>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Blending in an isolated group</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>isolation:isolate</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending two elements in an isolated group</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing two overlapping <code>rect</code> elements, each filled with a different solid color.<br>
+								Apply <code>isolation:isolate</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the second rect.</td>
+							<td>Only the intersection of the <code>rect</code> elements should mix.</td>
+						</tr>
+						<tr>
+							<td>Blending in an isolated group with 2D transform</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>isolation:isolate</code> and 2D transform on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Set isolation on an element from JavaScript</td>
+							<td>Set a background color for the SVG.
+								<br>Create a <code>rect</code> element and fill it with a solid color and a <code>mix-blend-mode</code> other than <code>normal</code>.
+								<br>Apply <code>isolation:isolate</code> on it from JavaScript.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+					</table>
+				</section>
+				<section>
+					<h4>In SVG, an element with <code>isolation:auto</code> set does not change the rendering behaviour</h4>
+					<table>
+						<tr>
+							<th>Test name</th>
+							<th>Elements and styles</th>
+							<th>Expected result</th>
+						</tr>
+						<tr>
+							<td>Blending a group with <code>isolation:auto</code></td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>isolation:auto</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The element will mix with the content behind it.</td>
+						</tr>
+						<tr>
+							<td>Blending in a group with opacity</td>
+							<td>Set a background color for the SVG.<br>
+								Create a <code>group</code> element containing a <code>rect</code> element filled with a different solid color.<br>
+								Apply <code>opacity</code> less than 1 and <code>isolation:auto</code> on the group and a <code>mix-blend-mode</code> other than <code>normal</code> on the <code>rect</code>.</td>
+							<td>The <code>rect</code> will not mix with the content behind it.</td>
+						</tr>
+					</table>
+				</section>
+			</section>
+	</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/toBlob.png.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/toBlob.png.html
new file mode 100644
index 00000000000..1533bfdb6c7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/toBlob.png.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>Canvas test: toBlob.png</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<canvas id="c"></canvas>
+<script>
+async_test(function() {
+    on_event(window, "load", this.step_func(function() {
+        var canvas = document.getElementById('c');
+        var ctx = canvas.getContext('2d');
+        canvas.toBlob(this.step_func_done(function(data) {
+            assert_equals(data.type, "image/png");
+        }), 'image/png');
+    }));
+}, "toBlob with image/png returns a PNG Blob");
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/will-change-abspos-cb-001.html b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/will-change-abspos-cb-001.html
new file mode 100644
index 00000000000..d59e443310f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/benchmarks/data/wpt/weighted/will-change-abspos-cb-001.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: position turns an element in an abspos containing block.</title>
+<link rel="author" title="Emilio Cobos �lvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Boris Zbarsky" href="mailto:bzbarsky@mit.edu">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1498873">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="match" href="will-change-abspos-cb-001-ref.html">
+<style>
+  .container {
+    border: 1px solid green;
+    width: 100px;
+    height: 100px;
+    margin-top: 100px;
+    display: flex;
+    will-change: position;
+  }
+  .abspos {
+    position: absolute;
+    top: 0;
+    left: 0;
+    background: orange;
+    height: 20px;
+    width: 20px;
+  }
+</style>
+<div class="container">
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/debug-info.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/debug-info.py
index f93fbdbeaec..b47b8ebfa2a 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/debug-info.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/debug-info.py
@@ -12,7 +12,7 @@ info = {
     "maxsize": sys.maxsize
 }
 
-search_modules = ["chardet", "datrie", "genshi", "html5lib", "lxml", "six"]
+search_modules = ["chardet", "genshi", "html5lib", "lxml", "six"]
 found_modules = []
 
 for m in search_modules:
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/doc/conf.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/doc/conf.py
index e02218b8ad3..22ebab4faa0 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/doc/conf.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/doc/conf.py
@@ -12,18 +12,11 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys, os
-
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.insert(0, os.path.abspath('.'))
+import sys
+import os
 
 # -- General configuration -----------------------------------------------------
 
-# If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
-
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.viewcode']
@@ -34,15 +27,12 @@ templates_path = ['_templates']
 # The suffix of source filenames.
 source_suffix = '.rst'
 
-# The encoding of source files.
-#source_encoding = 'utf-8-sig'
-
 # The master toctree document.
 master_doc = 'index'
 
 # General information about the project.
 project = 'html5lib'
-copyright = '2006 - 2013, James Graham, Geoffrey Sneddon, and contributors'
+copyright = '2006 - 2013, James Graham, Sam Sneddon, and contributors'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -52,203 +42,55 @@ copyright = '2006 - 2013, James Graham, Geoffrey Sneddon, and contributors'
 version = '1.0'
 # The full version, including alpha/beta/rc tags.
 sys.path.append(os.path.abspath('..'))
-from html5lib import __version__
+from html5lib import __version__  # noqa
 release = __version__
 
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#language = 'en'
-
-# There are two options for replacing |today|: either, you set today to some
-# non-false value, then it is used:
-#today = ''
-# Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
-
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 exclude_patterns = ['_build', 'theme']
 
-# The reST default role (used for this markup: `text`) to use for all documents.
-#default_role = None
-
-# If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
-
-# If true, the current module name will be prepended to all description
-# unit titles (such as .. function::).
-#add_module_names = True
-
-# If true, sectionauthor and moduleauthor directives will be shown in the
-# output. They are ignored by default.
-#show_authors = False
-
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 
-# A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
-
-# If true, keep warnings as "system message" paragraphs in the built documents.
-#keep_warnings = False
-
-
 # -- Options for HTML output ---------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 html_theme = 'default'
 
-# Theme options are theme-specific and customize the look and feel of a theme
-# further.  For a list of options available for each theme, see the
-# documentation.
-#html_theme_options = {}
-
-# Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
-
-# The name for this set of Sphinx documents.  If None, it defaults to
-# "<project> v<release> documentation".
-#html_title = None
-
-# A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
-
-# The name of an image file (relative to this directory) to place at the top
-# of the sidebar.
-#html_logo = None
-
-# The name of an image file (within the static path) to use as favicon of the
-# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
-# pixels large.
-#html_favicon = None
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
-#html_static_path = ['_static']
-
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-#html_last_updated_fmt = '%b %d, %Y'
-
-# If true, SmartyPants will be used to convert quotes and dashes to
-# typographically correct entities.
-#html_use_smartypants = True
-
-# Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
-
-# Additional templates that should be rendered to pages, maps page names to
-# template names.
-#html_additional_pages = {}
-
-# If false, no module index is generated.
-#html_domain_indices = True
-
-# If false, no index is generated.
-#html_use_index = True
-
-# If true, the index is split into individual pages for each letter.
-#html_split_index = False
-
-# If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
-
-# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
-
-# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
-
-# If true, an OpenSearch description file will be output, and all pages will
-# contain a <link> tag referring to it.  The value of this option must be the
-# base URL from which the finished HTML is served.
-#html_use_opensearch = ''
-
-# This is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = None
-
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'html5libdoc'
 
 
 # -- Options for LaTeX output --------------------------------------------------
 
-latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-}
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-  ('index', 'html5lib.tex', 'html5lib Documentation',
-   'James Graham, Geoffrey Sneddon, and contributors', 'manual'),
+    ('index', 'html5lib.tex', 'html5lib Documentation',
+     'James Graham, Sam Sneddon, and contributors', 'manual'),
 ]
 
-# The name of an image file (relative to this directory) to place at the top of
-# the title page.
-#latex_logo = None
-
-# For "manual" documents, if this is true, then toplevel headings are parts,
-# not chapters.
-#latex_use_parts = False
-
-# If true, show page references after internal links.
-#latex_show_pagerefs = False
-
-# If true, show URL addresses after external links.
-#latex_show_urls = False
-
-# Documents to append as an appendix to all manuals.
-#latex_appendices = []
-
-# If false, no module index is generated.
-#latex_domain_indices = True
-
-
 # -- Options for manual page output --------------------------------------------
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
     ('index', 'html5lib', 'html5lib Documentation',
-     ['James Graham, Geoffrey Sneddon, and contributors'], 1)
+     ['James Graham, Sam Sneddon, and contributors'], 1)
 ]
 
-# If true, show URL addresses after external links.
-#man_show_urls = False
-
-
 # -- Options for Texinfo output ------------------------------------------------
 
 # Grouping the document tree into Texinfo files. List of tuples
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-  ('index', 'html5lib', 'html5lib Documentation',
-   'James Graham, Geoffrey Sneddon, and contributors', 'html5lib', 'One line description of project.',
-   'Miscellaneous'),
+    ('index', 'html5lib', 'html5lib Documentation',
+     'James Graham, Sam Sneddon, and contributors', 'html5lib', 'One line description of project.',
+     'Miscellaneous'),
 ]
 
-# Documents to append as an appendix to all manuals.
-#texinfo_appendices = []
-
-# If false, no module index is generated.
-#texinfo_domain_indices = True
-
-# How to display URL addresses: 'footnote', 'no', or 'inline'.
-#texinfo_show_urls = 'footnote'
-
-# If true, do not generate a @detailmenu in the "Top" node's menu.
-#texinfo_no_detailmenu = False
 
 class CExtMock(object):
     """Required for autodoc on readthedocs.org where you cannot build C extensions."""
@@ -265,15 +107,16 @@ class CExtMock(object):
         else:
             return CExtMock()
 
+
 try:
-    import lxml   # flake8: noqa
+    import lxml   # noqa
 except ImportError:
     sys.modules['lxml'] = CExtMock()
     sys.modules['lxml.etree'] = CExtMock()
     print("warning: lxml modules mocked.")
 
 try:
-    import genshi   # flake8: noqa
+    import genshi  # noqa
 except ImportError:
     sys.modules['genshi'] = CExtMock()
     sys.modules['genshi.core'] = CExtMock()
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/__init__.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/__init__.py
index ba01065ef63..7b854f9900f 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/__init__.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/__init__.py
@@ -32,4 +32,4 @@ __all__ = ["HTMLParser", "parse", "parseFragment", "getTreeBuilder",
 
 # this has to be at the top level, see how setup.py parses this
 #: Distribution version number.
-__version__ = "1.0.1"
+__version__ = "1.2-dev"
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_ihatexml.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_ihatexml.py
index 4c77717bbc0..3ff803c1952 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_ihatexml.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_ihatexml.py
@@ -136,6 +136,7 @@ def normaliseCharList(charList):
         i += j
     return rv
 
+
 # We don't really support characters above the BMP :(
 max_unicode = int("FFFF", 16)
 
@@ -254,7 +255,7 @@ class InfosetFilter(object):
         nameRest = name[1:]
         m = nonXmlNameFirstBMPRegexp.match(nameFirst)
         if m:
-            warnings.warn("Coercing non-XML name", DataLossWarning)
+            warnings.warn("Coercing non-XML name: %s" % name, DataLossWarning)
             nameFirstOutput = self.getReplacementCharacter(nameFirst)
         else:
             nameFirstOutput = nameFirst
@@ -262,7 +263,7 @@ class InfosetFilter(object):
         nameRestOutput = nameRest
         replaceChars = set(nonXmlNameBMPRegexp.findall(nameRest))
         for char in replaceChars:
-            warnings.warn("Coercing non-XML name", DataLossWarning)
+            warnings.warn("Coercing non-XML name: %s" % name, DataLossWarning)
             replacement = self.getReplacementCharacter(char)
             nameRestOutput = nameRestOutput.replace(char, replacement)
         return nameFirstOutput + nameRestOutput
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_inputstream.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_inputstream.py
index 177f0ab9ee3..0207dd211b1 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_inputstream.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_inputstream.py
@@ -1,10 +1,11 @@
 from __future__ import absolute_import, division, unicode_literals
 
-from six import text_type, binary_type
+from six import text_type
 from six.moves import http_client, urllib
 
 import codecs
 import re
+from io import BytesIO, StringIO
 
 import webencodings
 
@@ -12,13 +13,6 @@ from .constants import EOF, spaceCharacters, asciiLetters, asciiUppercase
 from .constants import _ReparseException
 from . import _utils
 
-from io import StringIO
-
-try:
-    from io import BytesIO
-except ImportError:
-    BytesIO = StringIO
-
 # Non-unicode versions of constants for use in the pre-parser
 spaceCharactersBytes = frozenset([item.encode("ascii") for item in spaceCharacters])
 asciiLettersBytes = frozenset([item.encode("ascii") for item in asciiLetters])
@@ -40,13 +34,13 @@ if _utils.supports_lone_surrogates:
 else:
     invalid_unicode_re = re.compile(invalid_unicode_no_surrogate)
 
-non_bmp_invalid_codepoints = set([0x1FFFE, 0x1FFFF, 0x2FFFE, 0x2FFFF, 0x3FFFE,
-                                  0x3FFFF, 0x4FFFE, 0x4FFFF, 0x5FFFE, 0x5FFFF,
-                                  0x6FFFE, 0x6FFFF, 0x7FFFE, 0x7FFFF, 0x8FFFE,
-                                  0x8FFFF, 0x9FFFE, 0x9FFFF, 0xAFFFE, 0xAFFFF,
-                                  0xBFFFE, 0xBFFFF, 0xCFFFE, 0xCFFFF, 0xDFFFE,
-                                  0xDFFFF, 0xEFFFE, 0xEFFFF, 0xFFFFE, 0xFFFFF,
-                                  0x10FFFE, 0x10FFFF])
+non_bmp_invalid_codepoints = {0x1FFFE, 0x1FFFF, 0x2FFFE, 0x2FFFF, 0x3FFFE,
+                              0x3FFFF, 0x4FFFE, 0x4FFFF, 0x5FFFE, 0x5FFFF,
+                              0x6FFFE, 0x6FFFF, 0x7FFFE, 0x7FFFF, 0x8FFFE,
+                              0x8FFFF, 0x9FFFE, 0x9FFFF, 0xAFFFE, 0xAFFFF,
+                              0xBFFFE, 0xBFFFF, 0xCFFFE, 0xCFFFF, 0xDFFFE,
+                              0xDFFFF, 0xEFFFE, 0xEFFFF, 0xFFFFE, 0xFFFFF,
+                              0x10FFFE, 0x10FFFF}
 
 ascii_punctuation_re = re.compile("[\u0009-\u000D\u0020-\u002F\u003A-\u0040\u005C\u005B-\u0060\u007B-\u007E]")
 
@@ -367,7 +361,7 @@ class HTMLUnicodeInputStream(object):
     def unget(self, char):
         # Only one character is allowed to be ungotten at once - it must
         # be consumed again before any further call to unget
-        if char is not None:
+        if char is not EOF:
             if self.chunkOffset == 0:
                 # unget is called quite rarely, so it's a good idea to do
                 # more work here if it saves a bit of work in the frequently
@@ -449,7 +443,7 @@ class HTMLBinaryInputStream(HTMLUnicodeInputStream):
 
         try:
             stream.seek(stream.tell())
-        except:  # pylint:disable=bare-except
+        except Exception:
             stream = BufferedStream(stream)
 
         return stream
@@ -461,7 +455,7 @@ class HTMLBinaryInputStream(HTMLUnicodeInputStream):
         if charEncoding[0] is not None:
             return charEncoding
 
-        # If we've been overriden, we've been overriden
+        # If we've been overridden, we've been overridden
         charEncoding = lookupEncoding(self.override_encoding), "certain"
         if charEncoding[0] is not None:
             return charEncoding
@@ -664,9 +658,7 @@ class EncodingBytes(bytes):
         """Look for a sequence of bytes at the start of a string. If the bytes
         are found return True and advance the position to the byte after the
         match. Otherwise return False and leave the position alone"""
-        p = self.position
-        data = self[p:p + len(bytes)]
-        rv = data.startswith(bytes)
+        rv = self.startswith(bytes, self.position)
         if rv:
             self.position += len(bytes)
         return rv
@@ -674,15 +666,11 @@ class EncodingBytes(bytes):
     def jumpTo(self, bytes):
         """Look for the next sequence of bytes matching a given sequence. If
         a match is found advance the position to the last byte of the match"""
-        newPosition = self[self.position:].find(bytes)
-        if newPosition > -1:
-            # XXX: This is ugly, but I can't see a nicer way to fix this.
-            if self._position == -1:
-                self._position = 0
-            self._position += (newPosition + len(bytes) - 1)
-            return True
-        else:
+        try:
+            self._position = self.index(bytes, self.position) + len(bytes) - 1
+        except ValueError:
             raise StopIteration
+        return True
 
 
 class EncodingParser(object):
@@ -694,6 +682,9 @@ class EncodingParser(object):
         self.encoding = None
 
     def getEncoding(self):
+        if b"<meta" not in self.data:
+            return None
+
         methodDispatch = (
             (b"<!--", self.handleComment),
             (b"<meta", self.handleMeta),
@@ -703,6 +694,10 @@ class EncodingParser(object):
             (b"<", self.handlePossibleStartTag))
         for _ in self.data:
             keepParsing = True
+            try:
+                self.data.jumpTo(b"<")
+            except StopIteration:
+                break
             for key, method in methodDispatch:
                 if self.data.matchBytes(key):
                     try:
@@ -908,7 +903,7 @@ class ContentAttrParser(object):
 def lookupEncoding(encoding):
     """Return the python codec name corresponding to an encoding or None if the
     string doesn't correspond to a valid encoding."""
-    if isinstance(encoding, binary_type):
+    if isinstance(encoding, bytes):
         try:
             encoding = encoding.decode("ascii")
         except UnicodeDecodeError:
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_tokenizer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_tokenizer.py
index 6078f66aa0d..4748a19795e 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_tokenizer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_tokenizer.py
@@ -2,7 +2,8 @@ from __future__ import absolute_import, division, unicode_literals
 
 from six import unichr as chr
 
-from collections import deque
+from collections import deque, OrderedDict
+from sys import version_info
 
 from .constants import spaceCharacters
 from .constants import entities
@@ -17,6 +18,11 @@ from ._trie import Trie
 
 entitiesTrie = Trie(entities)
 
+if version_info >= (3, 7):
+    attributeMap = dict
+else:
+    attributeMap = OrderedDict
+
 
 class HTMLTokenizer(object):
     """ This class takes care of tokenizing HTML.
@@ -228,6 +234,14 @@ class HTMLTokenizer(object):
         # Add token to the queue to be yielded
         if (token["type"] in tagTokenTypes):
             token["name"] = token["name"].translate(asciiUpper2Lower)
+            if token["type"] == tokenTypes["StartTag"]:
+                raw = token["data"]
+                data = attributeMap(raw)
+                if len(raw) > len(data):
+                    # we had some duplicated attribute, fix so first wins
+                    data.update(raw[::-1])
+                token["data"] = data
+
             if token["type"] == tokenTypes["EndTag"]:
                 if token["data"]:
                     self.tokenQueue.append({"type": tokenTypes["ParseError"],
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/__init__.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/__init__.py
index a5ba4bf123a..07bad5d31c1 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/__init__.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/__init__.py
@@ -1,14 +1,5 @@
 from __future__ import absolute_import, division, unicode_literals
 
-from .py import Trie as PyTrie
+from .py import Trie
 
-Trie = PyTrie
-
-# pylint:disable=wrong-import-position
-try:
-    from .datrie import Trie as DATrie
-except ImportError:
-    pass
-else:
-    Trie = DATrie
-# pylint:enable=wrong-import-position
+__all__ = ["Trie"]
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/_base.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/_base.py
index a1158bbbfa5..6b71975f085 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/_base.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/_base.py
@@ -1,6 +1,9 @@
 from __future__ import absolute_import, division, unicode_literals
 
-from collections import Mapping
+try:
+    from collections.abc import Mapping
+except ImportError:  # Python 2.7
+    from collections import Mapping
 
 
 class Trie(Mapping):
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/datrie.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/datrie.py
deleted file mode 100644
index 51f3d046a74..00000000000
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_trie/datrie.py
+++ /dev/null
@@ -1,44 +0,0 @@
-from __future__ import absolute_import, division, unicode_literals
-
-from datrie import Trie as DATrie
-from six import text_type
-
-from ._base import Trie as ABCTrie
-
-
-class Trie(ABCTrie):
-    def __init__(self, data):
-        chars = set()
-        for key in data.keys():
-            if not isinstance(key, text_type):
-                raise TypeError("All keys must be strings")
-            for char in key:
-                chars.add(char)
-
-        self._data = DATrie("".join(chars))
-        for key, value in data.items():
-            self._data[key] = value
-
-    def __contains__(self, key):
-        return key in self._data
-
-    def __len__(self):
-        return len(self._data)
-
-    def __iter__(self):
-        raise NotImplementedError()
-
-    def __getitem__(self, key):
-        return self._data[key]
-
-    def keys(self, prefix=None):
-        return self._data.keys(prefix)
-
-    def has_keys_with_prefix(self, prefix):
-        return self._data.has_keys_with_prefix(prefix)
-
-    def longest_prefix(self, prefix):
-        return self._data.longest_prefix(prefix)
-
-    def longest_prefix_item(self, prefix):
-        return self._data.longest_prefix_item(prefix)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_utils.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_utils.py
index 91252f2c0a8..9ea5794214e 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_utils.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/_utils.py
@@ -2,12 +2,20 @@ from __future__ import absolute_import, division, unicode_literals
 
 from types import ModuleType
 
-from six import text_type
-
 try:
-    import xml.etree.cElementTree as default_etree
+    from collections.abc import Mapping
 except ImportError:
+    from collections import Mapping
+
+from six import text_type, PY3
+
+if PY3:
     import xml.etree.ElementTree as default_etree
+else:
+    try:
+        import xml.etree.cElementTree as default_etree
+    except ImportError:
+        import xml.etree.ElementTree as default_etree
 
 
 __all__ = ["default_etree", "MethodDispatcher", "isSurrogatePair",
@@ -27,7 +35,7 @@ try:
         # We need this with u"" because of http://bugs.jython.org/issue2039
         _x = eval('u"\\uD800"')  # pylint:disable=eval-used
         assert isinstance(_x, text_type)
-except:  # pylint:disable=bare-except
+except Exception:
     supports_lone_surrogates = False
 else:
     supports_lone_surrogates = True
@@ -47,9 +55,6 @@ class MethodDispatcher(dict):
     """
 
     def __init__(self, items=()):
-        # Using _dictEntries instead of directly assigning to self is about
-        # twice as fast. Please do careful performance testing before changing
-        # anything here.
         _dictEntries = []
         for name, value in items:
             if isinstance(name, (list, tuple, frozenset, set)):
@@ -64,6 +69,36 @@ class MethodDispatcher(dict):
     def __getitem__(self, key):
         return dict.get(self, key, self.default)
 
+    def __get__(self, instance, owner=None):
+        return BoundMethodDispatcher(instance, self)
+
+
+class BoundMethodDispatcher(Mapping):
+    """Wraps a MethodDispatcher, binding its return values to `instance`"""
+    def __init__(self, instance, dispatcher):
+        self.instance = instance
+        self.dispatcher = dispatcher
+
+    def __getitem__(self, key):
+        # see https://docs.python.org/3/reference/datamodel.html#object.__get__
+        # on a function, __get__ is used to bind a function to an instance as a bound method
+        return self.dispatcher[key].__get__(self.instance)
+
+    def get(self, key, default):
+        if key in self.dispatcher:
+            return self[key]
+        else:
+            return default
+
+    def __iter__(self):
+        return iter(self.dispatcher)
+
+    def __len__(self):
+        return len(self.dispatcher)
+
+    def __contains__(self, key):
+        return key in self.dispatcher
+
 
 # Some utility functions to deal with weirdness around UCS2 vs UCS4
 # python builds
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/constants.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/constants.py
index 1ff804190cd..fe3e237cd8a 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/constants.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/constants.py
@@ -519,8 +519,8 @@ adjustForeignAttributes = {
     "xmlns:xlink": ("xmlns", "xlink", namespaces["xmlns"])
 }
 
-unadjustForeignAttributes = dict([((ns, local), qname) for qname, (prefix, local, ns) in
-                                  adjustForeignAttributes.items()])
+unadjustForeignAttributes = {(ns, local): qname for qname, (prefix, local, ns) in
+                             adjustForeignAttributes.items()}
 
 spaceCharacters = frozenset([
     "\t",
@@ -544,8 +544,7 @@ asciiLetters = frozenset(string.ascii_letters)
 digits = frozenset(string.digits)
 hexDigits = frozenset(string.hexdigits)
 
-asciiUpper2Lower = dict([(ord(c), ord(c.lower()))
-                         for c in string.ascii_uppercase])
+asciiUpper2Lower = {ord(c): ord(c.lower()) for c in string.ascii_uppercase}
 
 # Heading elements need to be ordered
 headingElements = (
@@ -2934,7 +2933,7 @@ tagTokenTypes = frozenset([tokenTypes["StartTag"], tokenTypes["EndTag"],
                            tokenTypes["EmptyTag"]])
 
 
-prefixes = dict([(v, k) for k, v in namespaces.items()])
+prefixes = {v: k for k, v in namespaces.items()}
 prefixes["http://www.w3.org/1998/Math/MathML"] = "math"
 
 
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/filters/sanitizer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/filters/sanitizer.py
index e852f53be8a..70ef90665e5 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/filters/sanitizer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/filters/sanitizer.py
@@ -1,6 +1,15 @@
+"""Deprecated from html5lib 1.1.
+
+See `here <https://github.com/html5lib/html5lib-python/issues/443>`_ for
+information about its deprecation; `Bleach <https://github.com/mozilla/bleach>`_
+is recommended as a replacement. Please let us know in the aforementioned issue
+if Bleach is unsuitable for your needs.
+
+"""
 from __future__ import absolute_import, division, unicode_literals
 
 import re
+import warnings
 from xml.sax.saxutils import escape, unescape
 
 from six.moves import urllib_parse as urlparse
@@ -11,6 +20,14 @@ from ..constants import namespaces, prefixes
 __all__ = ["Filter"]
 
 
+_deprecation_msg = (
+    "html5lib's sanitizer is deprecated; see " +
+    "https://github.com/html5lib/html5lib-python/issues/443 and please let " +
+    "us know if Bleach is unsuitable for your needs"
+)
+
+warnings.warn(_deprecation_msg, DeprecationWarning)
+
 allowed_elements = frozenset((
     (namespaces['html'], 'a'),
     (namespaces['html'], 'abbr'),
@@ -750,6 +767,9 @@ class Filter(base.Filter):
 
         """
         super(Filter, self).__init__(source)
+
+        warnings.warn(_deprecation_msg, DeprecationWarning)
+
         self.allowed_elements = allowed_elements
         self.allowed_attributes = allowed_attributes
         self.allowed_css_properties = allowed_css_properties
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/html5parser.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/html5parser.py
index 9d39b9d41da..74d829d9847 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/html5parser.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/html5parser.py
@@ -2,7 +2,6 @@ from __future__ import absolute_import, division, unicode_literals
 from six import with_metaclass, viewkeys
 
 import types
-from collections import OrderedDict
 
 from . import _inputstream
 from . import _tokenizer
@@ -119,8 +118,8 @@ class HTMLParser(object):
         self.tree = tree(namespaceHTMLElements)
         self.errors = []
 
-        self.phases = dict([(name, cls(self, self.tree)) for name, cls in
-                            getPhases(debug).items()])
+        self.phases = {name: cls(self, self.tree) for name, cls in
+                       getPhases(debug).items()}
 
     def _parse(self, stream, innerHTML=False, container="div", scripting=False, **kwargs):
 
@@ -202,7 +201,7 @@ class HTMLParser(object):
         DoctypeToken = tokenTypes["Doctype"]
         ParseErrorToken = tokenTypes["ParseError"]
 
-        for token in self.normalizedTokens():
+        for token in self.tokenizer:
             prev_token = None
             new_token = token
             while new_token is not None:
@@ -260,10 +259,6 @@ class HTMLParser(object):
             if reprocess:
                 assert self.phase not in phases
 
-    def normalizedTokens(self):
-        for token in self.tokenizer:
-            yield self.normalizeToken(token)
-
     def parse(self, stream, *args, **kwargs):
         """Parse a HTML document into a well-formed tree
 
@@ -325,17 +320,6 @@ class HTMLParser(object):
         if self.strict:
             raise ParseError(E[errorcode] % datavars)
 
-    def normalizeToken(self, token):
-        # HTML5 specific normalizations to the token stream
-        if token["type"] == tokenTypes["StartTag"]:
-            raw = token["data"]
-            token["data"] = OrderedDict(raw)
-            if len(raw) > len(token["data"]):
-                # we had some duplicated attribute, fix so first wins
-                token["data"].update(raw[::-1])
-
-        return token
-
     def adjustMathMLAttributes(self, token):
         adjust_attributes(token, adjustMathMLAttributes)
 
@@ -413,16 +397,12 @@ class HTMLParser(object):
 def getPhases(debug):
     def log(function):
         """Logger that records which phase processes each token"""
-        type_names = dict((value, key) for key, value in
-                          tokenTypes.items())
+        type_names = {value: key for key, value in tokenTypes.items()}
 
         def wrapped(self, *args, **kwargs):
             if function.__name__.startswith("process") and len(args) > 0:
                 token = args[0]
-                try:
-                    info = {"type": type_names[token['type']]}
-                except:
-                    raise
+                info = {"type": type_names[token['type']]}
                 if token['type'] in tagTokenTypes:
                     info["name"] = token['name']
 
@@ -446,10 +426,13 @@ def getPhases(debug):
     class Phase(with_metaclass(getMetaclass(debug, log))):
         """Base class for helper object that implements each phase of processing
         """
+        __slots__ = ("parser", "tree", "__startTagCache", "__endTagCache")
 
         def __init__(self, parser, tree):
             self.parser = parser
             self.tree = tree
+            self.__startTagCache = {}
+            self.__endTagCache = {}
 
         def processEOF(self):
             raise NotImplementedError
@@ -469,7 +452,21 @@ def getPhases(debug):
             self.tree.insertText(token["data"])
 
         def processStartTag(self, token):
-            return self.startTagHandler[token["name"]](token)
+            # Note the caching is done here rather than BoundMethodDispatcher as doing it there
+            # requires a circular reference to the Phase, and this ends up with a significant
+            # (CPython 2.7, 3.8) GC cost when parsing many short inputs
+            name = token["name"]
+            # In Py2, using `in` is quicker in general than try/except KeyError
+            # In Py3, `in` is quicker when there are few cache hits (typically short inputs)
+            if name in self.__startTagCache:
+                func = self.__startTagCache[name]
+            else:
+                func = self.__startTagCache[name] = self.startTagHandler[name]
+                # bound the cache size in case we get loads of unknown tags
+                while len(self.__startTagCache) > len(self.startTagHandler) * 1.1:
+                    # this makes the eviction policy random on Py < 3.7 and FIFO >= 3.7
+                    self.__startTagCache.pop(next(iter(self.__startTagCache)))
+            return func(token)
 
         def startTagHtml(self, token):
             if not self.parser.firstStartTag and token["name"] == "html":
@@ -482,9 +479,25 @@ def getPhases(debug):
             self.parser.firstStartTag = False
 
         def processEndTag(self, token):
-            return self.endTagHandler[token["name"]](token)
+            # Note the caching is done here rather than BoundMethodDispatcher as doing it there
+            # requires a circular reference to the Phase, and this ends up with a significant
+            # (CPython 2.7, 3.8) GC cost when parsing many short inputs
+            name = token["name"]
+            # In Py2, using `in` is quicker in general than try/except KeyError
+            # In Py3, `in` is quicker when there are few cache hits (typically short inputs)
+            if name in self.__endTagCache:
+                func = self.__endTagCache[name]
+            else:
+                func = self.__endTagCache[name] = self.endTagHandler[name]
+                # bound the cache size in case we get loads of unknown tags
+                while len(self.__endTagCache) > len(self.endTagHandler) * 1.1:
+                    # this makes the eviction policy random on Py < 3.7 and FIFO >= 3.7
+                    self.__endTagCache.pop(next(iter(self.__endTagCache)))
+            return func(token)
 
     class InitialPhase(Phase):
+        __slots__ = tuple()
+
         def processSpaceCharacters(self, token):
             pass
 
@@ -613,6 +626,8 @@ def getPhases(debug):
             return True
 
     class BeforeHtmlPhase(Phase):
+        __slots__ = tuple()
+
         # helper methods
         def insertHtmlElement(self):
             self.tree.insertRoot(impliedTagToken("html", "StartTag"))
@@ -648,19 +663,7 @@ def getPhases(debug):
                 return token
 
     class BeforeHeadPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("head", self.startTagHead)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                (("head", "body", "html", "br"), self.endTagImplyHead)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             self.startTagHead(impliedTagToken("head", "StartTag"))
@@ -693,28 +696,19 @@ def getPhases(debug):
             self.parser.parseError("end-tag-after-implied-root",
                                    {"name": token["name"]})
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml),
+            ("head", startTagHead)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            (("head", "body", "html", "br"), endTagImplyHead)
+        ])
+        endTagHandler.default = endTagOther
+
     class InHeadPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("title", self.startTagTitle),
-                (("noframes", "style"), self.startTagNoFramesStyle),
-                ("noscript", self.startTagNoscript),
-                ("script", self.startTagScript),
-                (("base", "basefont", "bgsound", "command", "link"),
-                 self.startTagBaseLinkCommand),
-                ("meta", self.startTagMeta),
-                ("head", self.startTagHead)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("head", self.endTagHead),
-                (("br", "html", "body"), self.endTagHtmlBodyBr)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # the real thing
         def processEOF(self):
@@ -796,22 +790,27 @@ def getPhases(debug):
         def anythingElse(self):
             self.endTagHead(impliedTagToken("head"))
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml),
+            ("title", startTagTitle),
+            (("noframes", "style"), startTagNoFramesStyle),
+            ("noscript", startTagNoscript),
+            ("script", startTagScript),
+            (("base", "basefont", "bgsound", "command", "link"),
+             startTagBaseLinkCommand),
+            ("meta", startTagMeta),
+            ("head", startTagHead)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("head", endTagHead),
+            (("br", "html", "body"), endTagHtmlBodyBr)
+        ])
+        endTagHandler.default = endTagOther
+
     class InHeadNoscriptPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                (("basefont", "bgsound", "link", "meta", "noframes", "style"), self.startTagBaseLinkCommand),
-                (("head", "noscript"), self.startTagHeadNoscript),
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("noscript", self.endTagNoscript),
-                ("br", self.endTagBr),
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             self.parser.parseError("eof-in-head-noscript")
@@ -860,23 +859,21 @@ def getPhases(debug):
             # Caller must raise parse error first!
             self.endTagNoscript(impliedTagToken("noscript"))
 
-    class AfterHeadPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml),
+            (("basefont", "bgsound", "link", "meta", "noframes", "style"), startTagBaseLinkCommand),
+            (("head", "noscript"), startTagHeadNoscript),
+        ])
+        startTagHandler.default = startTagOther
 
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("body", self.startTagBody),
-                ("frameset", self.startTagFrameset),
-                (("base", "basefont", "bgsound", "link", "meta", "noframes", "script",
-                  "style", "title"),
-                 self.startTagFromHead),
-                ("head", self.startTagHead)
-            ])
-            self.startTagHandler.default = self.startTagOther
-            self.endTagHandler = _utils.MethodDispatcher([(("body", "html", "br"),
-                                                           self.endTagHtmlBodyBr)])
-            self.endTagHandler.default = self.endTagOther
+        endTagHandler = _utils.MethodDispatcher([
+            ("noscript", endTagNoscript),
+            ("br", endTagBr),
+        ])
+        endTagHandler.default = endTagOther
+
+    class AfterHeadPhase(Phase):
+        __slots__ = tuple()
 
         def processEOF(self):
             self.anythingElse()
@@ -927,80 +924,30 @@ def getPhases(debug):
             self.parser.phase = self.parser.phases["inBody"]
             self.parser.framesetOK = True
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml),
+            ("body", startTagBody),
+            ("frameset", startTagFrameset),
+            (("base", "basefont", "bgsound", "link", "meta", "noframes", "script",
+              "style", "title"),
+             startTagFromHead),
+            ("head", startTagHead)
+        ])
+        startTagHandler.default = startTagOther
+        endTagHandler = _utils.MethodDispatcher([(("body", "html", "br"),
+                                                  endTagHtmlBodyBr)])
+        endTagHandler.default = endTagOther
+
     class InBodyPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#parsing-main-inbody
         # the really-really-really-very crazy mode
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
+        __slots__ = ("processSpaceCharacters",)
 
+        def __init__(self, *args, **kwargs):
+            super(InBodyPhase, self).__init__(*args, **kwargs)
             # Set this to the default handler
             self.processSpaceCharacters = self.processSpaceCharactersNonPre
 
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                (("base", "basefont", "bgsound", "command", "link", "meta",
-                  "script", "style", "title"),
-                 self.startTagProcessInHead),
-                ("body", self.startTagBody),
-                ("frameset", self.startTagFrameset),
-                (("address", "article", "aside", "blockquote", "center", "details",
-                  "dir", "div", "dl", "fieldset", "figcaption", "figure",
-                  "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p",
-                  "section", "summary", "ul"),
-                 self.startTagCloseP),
-                (headingElements, self.startTagHeading),
-                (("pre", "listing"), self.startTagPreListing),
-                ("form", self.startTagForm),
-                (("li", "dd", "dt"), self.startTagListItem),
-                ("plaintext", self.startTagPlaintext),
-                ("a", self.startTagA),
-                (("b", "big", "code", "em", "font", "i", "s", "small", "strike",
-                  "strong", "tt", "u"), self.startTagFormatting),
-                ("nobr", self.startTagNobr),
-                ("button", self.startTagButton),
-                (("applet", "marquee", "object"), self.startTagAppletMarqueeObject),
-                ("xmp", self.startTagXmp),
-                ("table", self.startTagTable),
-                (("area", "br", "embed", "img", "keygen", "wbr"),
-                 self.startTagVoidFormatting),
-                (("param", "source", "track"), self.startTagParamSource),
-                ("input", self.startTagInput),
-                ("hr", self.startTagHr),
-                ("image", self.startTagImage),
-                ("isindex", self.startTagIsIndex),
-                ("textarea", self.startTagTextarea),
-                ("iframe", self.startTagIFrame),
-                ("noscript", self.startTagNoscript),
-                (("noembed", "noframes"), self.startTagRawtext),
-                ("select", self.startTagSelect),
-                (("rp", "rt"), self.startTagRpRt),
-                (("option", "optgroup"), self.startTagOpt),
-                (("math"), self.startTagMath),
-                (("svg"), self.startTagSvg),
-                (("caption", "col", "colgroup", "frame", "head",
-                  "tbody", "td", "tfoot", "th", "thead",
-                  "tr"), self.startTagMisplaced)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("body", self.endTagBody),
-                ("html", self.endTagHtml),
-                (("address", "article", "aside", "blockquote", "button", "center",
-                  "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure",
-                  "footer", "header", "hgroup", "listing", "main", "menu", "nav", "ol", "pre",
-                  "section", "summary", "ul"), self.endTagBlock),
-                ("form", self.endTagForm),
-                ("p", self.endTagP),
-                (("dd", "dt", "li"), self.endTagListItem),
-                (headingElements, self.endTagHeading),
-                (("a", "b", "big", "code", "em", "font", "i", "nobr", "s", "small",
-                  "strike", "strong", "tt", "u"), self.endTagFormatting),
-                (("applet", "marquee", "object"), self.endTagAppletMarqueeObject),
-                ("br", self.endTagBr),
-            ])
-            self.endTagHandler.default = self.endTagOther
-
         def isMatchingFormattingElement(self, node1, node2):
             return (node1.name == node2.name and
                     node1.namespace == node2.namespace and
@@ -1650,14 +1597,73 @@ def getPhases(debug):
                         self.parser.parseError("unexpected-end-tag", {"name": token["name"]})
                         break
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            (("base", "basefont", "bgsound", "command", "link", "meta",
+              "script", "style", "title"),
+             startTagProcessInHead),
+            ("body", startTagBody),
+            ("frameset", startTagFrameset),
+            (("address", "article", "aside", "blockquote", "center", "details",
+              "dir", "div", "dl", "fieldset", "figcaption", "figure",
+              "footer", "header", "hgroup", "main", "menu", "nav", "ol", "p",
+              "section", "summary", "ul"),
+             startTagCloseP),
+            (headingElements, startTagHeading),
+            (("pre", "listing"), startTagPreListing),
+            ("form", startTagForm),
+            (("li", "dd", "dt"), startTagListItem),
+            ("plaintext", startTagPlaintext),
+            ("a", startTagA),
+            (("b", "big", "code", "em", "font", "i", "s", "small", "strike",
+              "strong", "tt", "u"), startTagFormatting),
+            ("nobr", startTagNobr),
+            ("button", startTagButton),
+            (("applet", "marquee", "object"), startTagAppletMarqueeObject),
+            ("xmp", startTagXmp),
+            ("table", startTagTable),
+            (("area", "br", "embed", "img", "keygen", "wbr"),
+             startTagVoidFormatting),
+            (("param", "source", "track"), startTagParamSource),
+            ("input", startTagInput),
+            ("hr", startTagHr),
+            ("image", startTagImage),
+            ("isindex", startTagIsIndex),
+            ("textarea", startTagTextarea),
+            ("iframe", startTagIFrame),
+            ("noscript", startTagNoscript),
+            (("noembed", "noframes"), startTagRawtext),
+            ("select", startTagSelect),
+            (("rp", "rt"), startTagRpRt),
+            (("option", "optgroup"), startTagOpt),
+            (("math"), startTagMath),
+            (("svg"), startTagSvg),
+            (("caption", "col", "colgroup", "frame", "head",
+              "tbody", "td", "tfoot", "th", "thead",
+              "tr"), startTagMisplaced)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("body", endTagBody),
+            ("html", endTagHtml),
+            (("address", "article", "aside", "blockquote", "button", "center",
+              "details", "dialog", "dir", "div", "dl", "fieldset", "figcaption", "figure",
+              "footer", "header", "hgroup", "listing", "main", "menu", "nav", "ol", "pre",
+              "section", "summary", "ul"), endTagBlock),
+            ("form", endTagForm),
+            ("p", endTagP),
+            (("dd", "dt", "li"), endTagListItem),
+            (headingElements, endTagHeading),
+            (("a", "b", "big", "code", "em", "font", "i", "nobr", "s", "small",
+              "strike", "strong", "tt", "u"), endTagFormatting),
+            (("applet", "marquee", "object"), endTagAppletMarqueeObject),
+            ("br", endTagBr),
+        ])
+        endTagHandler.default = endTagOther
+
     class TextPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-            self.startTagHandler = _utils.MethodDispatcher([])
-            self.startTagHandler.default = self.startTagOther
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("script", self.endTagScript)])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processCharacters(self, token):
             self.tree.insertText(token["data"])
@@ -1683,30 +1689,15 @@ def getPhases(debug):
             self.tree.openElements.pop()
             self.parser.phase = self.parser.originalPhase
 
+        startTagHandler = _utils.MethodDispatcher([])
+        startTagHandler.default = startTagOther
+        endTagHandler = _utils.MethodDispatcher([
+            ("script", endTagScript)])
+        endTagHandler.default = endTagOther
+
     class InTablePhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-table
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("caption", self.startTagCaption),
-                ("colgroup", self.startTagColgroup),
-                ("col", self.startTagCol),
-                (("tbody", "tfoot", "thead"), self.startTagRowGroup),
-                (("td", "th", "tr"), self.startTagImplyTbody),
-                ("table", self.startTagTable),
-                (("style", "script"), self.startTagStyleScript),
-                ("input", self.startTagInput),
-                ("form", self.startTagForm)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("table", self.endTagTable),
-                (("body", "caption", "col", "colgroup", "html", "tbody", "td",
-                  "tfoot", "th", "thead", "tr"), self.endTagIgnore)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # helper methods
         def clearStackToTableContext(self):
@@ -1828,9 +1819,32 @@ def getPhases(debug):
             self.parser.phases["inBody"].processEndTag(token)
             self.tree.insertFromTable = False
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("caption", startTagCaption),
+            ("colgroup", startTagColgroup),
+            ("col", startTagCol),
+            (("tbody", "tfoot", "thead"), startTagRowGroup),
+            (("td", "th", "tr"), startTagImplyTbody),
+            ("table", startTagTable),
+            (("style", "script"), startTagStyleScript),
+            ("input", startTagInput),
+            ("form", startTagForm)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("table", endTagTable),
+            (("body", "caption", "col", "colgroup", "html", "tbody", "td",
+              "tfoot", "th", "thead", "tr"), endTagIgnore)
+        ])
+        endTagHandler.default = endTagOther
+
     class InTableTextPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
+        __slots__ = ("originalPhase", "characterTokens")
+
+        def __init__(self, *args, **kwargs):
+            super(InTableTextPhase, self).__init__(*args, **kwargs)
             self.originalPhase = None
             self.characterTokens = []
 
@@ -1875,23 +1889,7 @@ def getPhases(debug):
 
     class InCaptionPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-caption
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                (("caption", "col", "colgroup", "tbody", "td", "tfoot", "th",
-                  "thead", "tr"), self.startTagTableElement)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("caption", self.endTagCaption),
-                ("table", self.endTagTable),
-                (("body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th",
-                  "thead", "tr"), self.endTagIgnore)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def ignoreEndTagCaption(self):
             return not self.tree.elementInScope("caption", variant="table")
@@ -1944,23 +1942,24 @@ def getPhases(debug):
         def endTagOther(self, token):
             return self.parser.phases["inBody"].processEndTag(token)
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            (("caption", "col", "colgroup", "tbody", "td", "tfoot", "th",
+              "thead", "tr"), startTagTableElement)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("caption", endTagCaption),
+            ("table", endTagTable),
+            (("body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th",
+              "thead", "tr"), endTagIgnore)
+        ])
+        endTagHandler.default = endTagOther
+
     class InColumnGroupPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-column
-
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("col", self.startTagCol)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("colgroup", self.endTagColgroup),
-                ("col", self.endTagCol)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def ignoreEndTagColgroup(self):
             return self.tree.openElements[-1].name == "html"
@@ -2010,26 +2009,21 @@ def getPhases(debug):
             if not ignoreEndTag:
                 return token
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("col", startTagCol)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("colgroup", endTagColgroup),
+            ("col", endTagCol)
+        ])
+        endTagHandler.default = endTagOther
+
     class InTableBodyPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-table0
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("tr", self.startTagTr),
-                (("td", "th"), self.startTagTableCell),
-                (("caption", "col", "colgroup", "tbody", "tfoot", "thead"),
-                 self.startTagTableOther)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                (("tbody", "tfoot", "thead"), self.endTagTableRowGroup),
-                ("table", self.endTagTable),
-                (("body", "caption", "col", "colgroup", "html", "td", "th",
-                  "tr"), self.endTagIgnore)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # helper methods
         def clearStackToTableBodyContext(self):
@@ -2108,26 +2102,26 @@ def getPhases(debug):
         def endTagOther(self, token):
             return self.parser.phases["inTable"].processEndTag(token)
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("tr", startTagTr),
+            (("td", "th"), startTagTableCell),
+            (("caption", "col", "colgroup", "tbody", "tfoot", "thead"),
+             startTagTableOther)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            (("tbody", "tfoot", "thead"), endTagTableRowGroup),
+            ("table", endTagTable),
+            (("body", "caption", "col", "colgroup", "html", "td", "th",
+              "tr"), endTagIgnore)
+        ])
+        endTagHandler.default = endTagOther
+
     class InRowPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-row
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                (("td", "th"), self.startTagTableCell),
-                (("caption", "col", "colgroup", "tbody", "tfoot", "thead",
-                  "tr"), self.startTagTableOther)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("tr", self.endTagTr),
-                ("table", self.endTagTable),
-                (("tbody", "tfoot", "thead"), self.endTagTableRowGroup),
-                (("body", "caption", "col", "colgroup", "html", "td", "th"),
-                 self.endTagIgnore)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # helper methods (XXX unify this with other table helper methods)
         def clearStackToTableRowContext(self):
@@ -2197,23 +2191,26 @@ def getPhases(debug):
         def endTagOther(self, token):
             return self.parser.phases["inTable"].processEndTag(token)
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            (("td", "th"), startTagTableCell),
+            (("caption", "col", "colgroup", "tbody", "tfoot", "thead",
+              "tr"), startTagTableOther)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("tr", endTagTr),
+            ("table", endTagTable),
+            (("tbody", "tfoot", "thead"), endTagTableRowGroup),
+            (("body", "caption", "col", "colgroup", "html", "td", "th"),
+             endTagIgnore)
+        ])
+        endTagHandler.default = endTagOther
+
     class InCellPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-cell
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                (("caption", "col", "colgroup", "tbody", "td", "tfoot", "th",
-                  "thead", "tr"), self.startTagTableOther)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                (("td", "th"), self.endTagTableCell),
-                (("body", "caption", "col", "colgroup", "html"), self.endTagIgnore),
-                (("table", "tbody", "tfoot", "thead", "tr"), self.endTagImply)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # helper
         def closeCell(self):
@@ -2273,26 +2270,22 @@ def getPhases(debug):
         def endTagOther(self, token):
             return self.parser.phases["inBody"].processEndTag(token)
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            (("caption", "col", "colgroup", "tbody", "td", "tfoot", "th",
+              "thead", "tr"), startTagTableOther)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            (("td", "th"), endTagTableCell),
+            (("body", "caption", "col", "colgroup", "html"), endTagIgnore),
+            (("table", "tbody", "tfoot", "thead", "tr"), endTagImply)
+        ])
+        endTagHandler.default = endTagOther
+
     class InSelectPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("option", self.startTagOption),
-                ("optgroup", self.startTagOptgroup),
-                ("select", self.startTagSelect),
-                (("input", "keygen", "textarea"), self.startTagInput),
-                ("script", self.startTagScript)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("option", self.endTagOption),
-                ("optgroup", self.endTagOptgroup),
-                ("select", self.endTagSelect)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         # http://www.whatwg.org/specs/web-apps/current-work/#in-select
         def processEOF(self):
@@ -2373,21 +2366,25 @@ def getPhases(debug):
             self.parser.parseError("unexpected-end-tag-in-select",
                                    {"name": token["name"]})
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("option", startTagOption),
+            ("optgroup", startTagOptgroup),
+            ("select", startTagSelect),
+            (("input", "keygen", "textarea"), startTagInput),
+            ("script", startTagScript)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("option", endTagOption),
+            ("optgroup", endTagOptgroup),
+            ("select", endTagSelect)
+        ])
+        endTagHandler.default = endTagOther
+
     class InSelectInTablePhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                (("caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"),
-                 self.startTagTable)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                (("caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"),
-                 self.endTagTable)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             self.parser.phases["inSelect"].processEOF()
@@ -2412,7 +2409,21 @@ def getPhases(debug):
         def endTagOther(self, token):
             return self.parser.phases["inSelect"].processEndTag(token)
 
+        startTagHandler = _utils.MethodDispatcher([
+            (("caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"),
+             startTagTable)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            (("caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"),
+             endTagTable)
+        ])
+        endTagHandler.default = endTagOther
+
     class InForeignContentPhase(Phase):
+        __slots__ = tuple()
+
         breakoutElements = frozenset(["b", "big", "blockquote", "body", "br",
                                       "center", "code", "dd", "div", "dl", "dt",
                                       "em", "embed", "h1", "h2", "h3",
@@ -2422,9 +2433,6 @@ def getPhases(debug):
                                       "span", "strong", "strike", "sub", "sup",
                                       "table", "tt", "u", "ul", "var"])
 
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
         def adjustSVGTagNames(self, token):
             replacements = {"altglyph": "altGlyph",
                             "altglyphdef": "altGlyphDef",
@@ -2478,7 +2486,7 @@ def getPhases(debug):
             currentNode = self.tree.openElements[-1]
             if (token["name"] in self.breakoutElements or
                 (token["name"] == "font" and
-                 set(token["data"].keys()) & set(["color", "face", "size"]))):
+                 set(token["data"].keys()) & {"color", "face", "size"})):
                 self.parser.parseError("unexpected-html-element-in-foreign-content",
                                        {"name": token["name"]})
                 while (self.tree.openElements[-1].namespace !=
@@ -2528,16 +2536,7 @@ def getPhases(debug):
             return new_token
 
     class AfterBodyPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([("html", self.endTagHtml)])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             # Stop parsing
@@ -2574,23 +2573,17 @@ def getPhases(debug):
             self.parser.phase = self.parser.phases["inBody"]
             return token
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([("html", endTagHtml)])
+        endTagHandler.default = endTagOther
+
     class InFramesetPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#in-frameset
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("frameset", self.startTagFrameset),
-                ("frame", self.startTagFrame),
-                ("noframes", self.startTagNoframes)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("frameset", self.endTagFrameset)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             if self.tree.openElements[-1].name != "html":
@@ -2631,21 +2624,22 @@ def getPhases(debug):
             self.parser.parseError("unexpected-end-tag-in-frameset",
                                    {"name": token["name"]})
 
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("frameset", startTagFrameset),
+            ("frame", startTagFrame),
+            ("noframes", startTagNoframes)
+        ])
+        startTagHandler.default = startTagOther
+
+        endTagHandler = _utils.MethodDispatcher([
+            ("frameset", endTagFrameset)
+        ])
+        endTagHandler.default = endTagOther
+
     class AfterFramesetPhase(Phase):
         # http://www.whatwg.org/specs/web-apps/current-work/#after3
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
-
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("noframes", self.startTagNoframes)
-            ])
-            self.startTagHandler.default = self.startTagOther
-
-            self.endTagHandler = _utils.MethodDispatcher([
-                ("html", self.endTagHtml)
-            ])
-            self.endTagHandler.default = self.endTagOther
+        __slots__ = tuple()
 
         def processEOF(self):
             # Stop parsing
@@ -2668,14 +2662,19 @@ def getPhases(debug):
             self.parser.parseError("unexpected-end-tag-after-frameset",
                                    {"name": token["name"]})
 
-    class AfterAfterBodyPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", Phase.startTagHtml),
+            ("noframes", startTagNoframes)
+        ])
+        startTagHandler.default = startTagOther
 
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml)
-            ])
-            self.startTagHandler.default = self.startTagOther
+        endTagHandler = _utils.MethodDispatcher([
+            ("html", endTagHtml)
+        ])
+        endTagHandler.default = endTagOther
+
+    class AfterAfterBodyPhase(Phase):
+        __slots__ = tuple()
 
         def processEOF(self):
             pass
@@ -2706,15 +2705,13 @@ def getPhases(debug):
             self.parser.phase = self.parser.phases["inBody"]
             return token
 
-    class AfterAfterFramesetPhase(Phase):
-        def __init__(self, parser, tree):
-            Phase.__init__(self, parser, tree)
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml)
+        ])
+        startTagHandler.default = startTagOther
 
-            self.startTagHandler = _utils.MethodDispatcher([
-                ("html", self.startTagHtml),
-                ("noframes", self.startTagNoFrames)
-            ])
-            self.startTagHandler.default = self.startTagOther
+    class AfterAfterFramesetPhase(Phase):
+        __slots__ = tuple()
 
         def processEOF(self):
             pass
@@ -2741,6 +2738,13 @@ def getPhases(debug):
         def processEndTag(self, token):
             self.parser.parseError("expected-eof-but-got-end-tag",
                                    {"name": token["name"]})
+
+        startTagHandler = _utils.MethodDispatcher([
+            ("html", startTagHtml),
+            ("noframes", startTagNoFrames)
+        ])
+        startTagHandler.default = startTagOther
+
     # pylint:enable=unused-argument
 
     return {
@@ -2774,8 +2778,8 @@ def getPhases(debug):
 def adjust_attributes(token, replacements):
     needs_adjustment = viewkeys(token['data']) & viewkeys(replacements)
     if needs_adjustment:
-        token['data'] = OrderedDict((replacements.get(k, k), v)
-                                    for k, v in token['data'].items())
+        token['data'] = type(token['data'])((replacements.get(k, k), v)
+                                            for k, v in token['data'].items())
 
 
 def impliedTagToken(name, type="EndTag", attributes=None,
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/serializer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/serializer.py
index d6b7105d480..c66df683926 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/serializer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/serializer.py
@@ -274,7 +274,7 @@ class HTMLSerializer(object):
                 if token["systemId"]:
                     if token["systemId"].find('"') >= 0:
                         if token["systemId"].find("'") >= 0:
-                            self.serializeError("System identifer contains both single and double quote characters")
+                            self.serializeError("System identifier contains both single and double quote characters")
                         quote_char = "'"
                     else:
                         quote_char = '"'
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/sanitizer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/sanitizer.py
index 93882ec477c..bb4834214f3 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/sanitizer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/sanitizer.py
@@ -27,14 +27,15 @@ class SanitizerTest(pytest.Item):
         expected = self.test["output"]
 
         parsed = parseFragment(input)
-        serialized = serialize(parsed,
-                               sanitize=True,
-                               omit_optional_tags=False,
-                               use_trailing_solidus=True,
-                               space_before_trailing_solidus=False,
-                               quote_attr_values="always",
-                               quote_char="'",
-                               alphabetical_attributes=True)
+        with pytest.deprecated_call():
+            serialized = serialize(parsed,
+                                   sanitize=True,
+                                   omit_optional_tags=False,
+                                   use_trailing_solidus=True,
+                                   space_before_trailing_solidus=False,
+                                   quote_attr_values="always",
+                                   quote_char="'",
+                                   alphabetical_attributes=True)
         errorMsg = "\n".join(["\n\nInput:", input,
                               "\nExpected:", expected,
                               "\nReceived:", serialized])
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/serializer-testdata/core.test b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/serializer-testdata/core.test
index 70828d0d25e..55294b6831b 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/serializer-testdata/core.test
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/serializer-testdata/core.test
@@ -375,7 +375,7 @@
                     "-//W3C//DTD HTML 4.01//EN"
                 ]
             ],
-            "description": "HTML 4.01 DOCTYPE without system identifer"
+            "description": "HTML 4.01 DOCTYPE without system identifier"
         },
         {
             "expected": [
@@ -389,7 +389,7 @@
                     "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"
                 ]
             ],
-            "description": "IBM DOCTYPE without public identifer"
+            "description": "IBM DOCTYPE without public identifier"
         }
     ]
 }
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/support.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/support.py
index dab65c1c9d1..9cd5afbe69c 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/support.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/support.py
@@ -143,11 +143,12 @@ def convert(stripChars):
         return "\n".join(rv)
     return convertData
 
+
 convertExpected = convert(2)
 
 
 def errorMessage(input, expected, actual):
-    msg = ("Input:\n%s\nExpected:\n%s\nRecieved\n%s\n" %
+    msg = ("Input:\n%s\nExpected:\n%s\nReceived\n%s\n" %
            (repr(input), repr(expected), repr(actual)))
     if sys.version_info[0] == 2:
         msg = msg.encode("ascii", "backslashreplace")
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_encoding.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_encoding.py
index 9a411c77d28..47c4814a474 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_encoding.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_encoding.py
@@ -75,7 +75,15 @@ def test_parser_args_raises(kwargs):
     assert exc_info.value.args[0].startswith("Cannot set an encoding with a unicode input")
 
 
-def runParserEncodingTest(data, encoding):
+def param_encoding():
+    for filename in get_data_files("encoding"):
+        tests = _TestData(filename, b"data", encoding=None)
+        for test in tests:
+            yield test[b'data'], test[b'encoding']
+
+
+@pytest.mark.parametrize("data, encoding", param_encoding())
+def test_parser_encoding(data, encoding):
     p = HTMLParser()
     assert p.documentEncoding is None
     p.parse(data, useChardet=False)
@@ -84,7 +92,8 @@ def runParserEncodingTest(data, encoding):
     assert encoding == p.documentEncoding, errorMessage(data, encoding, p.documentEncoding)
 
 
-def runPreScanEncodingTest(data, encoding):
+@pytest.mark.parametrize("data, encoding", param_encoding())
+def test_prescan_encoding(data, encoding):
     stream = _inputstream.HTMLBinaryInputStream(data, useChardet=False)
     encoding = encoding.lower().decode("ascii")
 
@@ -95,14 +104,6 @@ def runPreScanEncodingTest(data, encoding):
     assert encoding == stream.charEncoding[0].name, errorMessage(data, encoding, stream.charEncoding[0].name)
 
 
-def test_encoding():
-    for filename in get_data_files("encoding"):
-        tests = _TestData(filename, b"data", encoding=None)
-        for test in tests:
-            yield (runParserEncodingTest, test[b'data'], test[b'encoding'])
-            yield (runPreScanEncodingTest, test[b'data'], test[b'encoding'])
-
-
 # pylint:disable=wrong-import-position
 try:
     import chardet  # noqa
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_meta.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_meta.py
index e42eafdba4a..dd02dd7fb77 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_meta.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_meta.py
@@ -28,10 +28,10 @@ def test_errorMessage():
 
     # Assertions!
     if six.PY2:
-        assert b"Input:\n1\nExpected:\n2\nRecieved\n3\n" == r
+        assert b"Input:\n1\nExpected:\n2\nReceived\n3\n" == r
     else:
         assert six.PY3
-        assert "Input:\n1\nExpected:\n2\nRecieved\n3\n" == r
+        assert "Input:\n1\nExpected:\n2\nReceived\n3\n" == r
 
     assert input.__repr__.call_count == 1
     assert expected.__repr__.call_count == 1
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_parser2.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_parser2.py
index bcc0bf48f08..879d2447df3 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_parser2.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_parser2.py
@@ -1,12 +1,12 @@
 from __future__ import absolute_import, division, unicode_literals
 
-from six import PY2, text_type, unichr
+from six import PY2, text_type
 
 import io
 
 from . import support  # noqa
 
-from html5lib.constants import namespaces, tokenTypes
+from html5lib.constants import namespaces
 from html5lib import parse, parseFragment, HTMLParser
 
 
@@ -53,42 +53,6 @@ def test_unicode_file():
     assert parse(io.StringIO("a")) is not None
 
 
-def test_maintain_attribute_order():
-    # This is here because we impl it in parser and not tokenizer
-    p = HTMLParser()
-    # generate loads to maximize the chance a hash-based mutation will occur
-    attrs = [(unichr(x), i) for i, x in enumerate(range(ord('a'), ord('z')))]
-    token = {'name': 'html',
-             'selfClosing': False,
-             'selfClosingAcknowledged': False,
-             'type': tokenTypes["StartTag"],
-             'data': attrs}
-    out = p.normalizeToken(token)
-    attr_order = list(out["data"].keys())
-    assert attr_order == [x for x, i in attrs]
-
-
-def test_duplicate_attribute():
-    # This is here because we impl it in parser and not tokenizer
-    doc = parse('<p class=a class=b>')
-    el = doc[1][0]
-    assert el.get("class") == "a"
-
-
-def test_maintain_duplicate_attribute_order():
-    # This is here because we impl it in parser and not tokenizer
-    p = HTMLParser()
-    attrs = [(unichr(x), i) for i, x in enumerate(range(ord('a'), ord('z')))]
-    token = {'name': 'html',
-             'selfClosing': False,
-             'selfClosingAcknowledged': False,
-             'type': tokenTypes["StartTag"],
-             'data': attrs + [('a', len(attrs))]}
-    out = p.normalizeToken(token)
-    attr_order = list(out["data"].keys())
-    assert attr_order == [x for x, i in attrs]
-
-
 def test_debug_log():
     parser = HTMLParser(debug=True)
     parser.parse("<!doctype html><title>a</title><p>b<script>c</script>d</p>e")
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_sanitizer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_sanitizer.py
index 45046d57229..f3faeb80504 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_sanitizer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_sanitizer.py
@@ -1,31 +1,22 @@
 from __future__ import absolute_import, division, unicode_literals
 
+import pytest
+
 from html5lib import constants, parseFragment, serialize
 from html5lib.filters import sanitizer
 
 
-def runSanitizerTest(_, expected, input):
-    parsed = parseFragment(expected)
-    expected = serialize(parsed,
-                         omit_optional_tags=False,
-                         use_trailing_solidus=True,
-                         space_before_trailing_solidus=False,
-                         quote_attr_values="always",
-                         quote_char='"',
-                         alphabetical_attributes=True)
-    assert expected == sanitize_html(input)
-
-
 def sanitize_html(stream):
     parsed = parseFragment(stream)
-    serialized = serialize(parsed,
-                           sanitize=True,
-                           omit_optional_tags=False,
-                           use_trailing_solidus=True,
-                           space_before_trailing_solidus=False,
-                           quote_attr_values="always",
-                           quote_char='"',
-                           alphabetical_attributes=True)
+    with pytest.deprecated_call():
+        serialized = serialize(parsed,
+                               sanitize=True,
+                               omit_optional_tags=False,
+                               use_trailing_solidus=True,
+                               space_before_trailing_solidus=False,
+                               quote_attr_values="always",
+                               quote_char='"',
+                               alphabetical_attributes=True)
     return serialized
 
 
@@ -59,7 +50,7 @@ def test_data_uri_disallowed_type():
     assert expected == sanitized
 
 
-def test_sanitizer():
+def param_sanitizer():
     for ns, tag_name in sanitizer.allowed_elements:
         if ns != constants.namespaces["html"]:
             continue
@@ -67,19 +58,19 @@ def test_sanitizer():
                         'tfoot', 'th', 'thead', 'tr', 'select']:
             continue  # TODO
         if tag_name == 'image':
-            yield (runSanitizerTest, "test_should_allow_%s_tag" % tag_name,
+            yield ("test_should_allow_%s_tag" % tag_name,
                    "<img title=\"1\"/>foo &lt;bad&gt;bar&lt;/bad&gt; baz",
                    "<%s title='1'>foo <bad>bar</bad> baz</%s>" % (tag_name, tag_name))
         elif tag_name == 'br':
-            yield (runSanitizerTest, "test_should_allow_%s_tag" % tag_name,
+            yield ("test_should_allow_%s_tag" % tag_name,
                    "<br title=\"1\"/>foo &lt;bad&gt;bar&lt;/bad&gt; baz<br/>",
                    "<%s title='1'>foo <bad>bar</bad> baz</%s>" % (tag_name, tag_name))
         elif tag_name in constants.voidElements:
-            yield (runSanitizerTest, "test_should_allow_%s_tag" % tag_name,
+            yield ("test_should_allow_%s_tag" % tag_name,
                    "<%s title=\"1\"/>foo &lt;bad&gt;bar&lt;/bad&gt; baz" % tag_name,
                    "<%s title='1'>foo <bad>bar</bad> baz</%s>" % (tag_name, tag_name))
         else:
-            yield (runSanitizerTest, "test_should_allow_%s_tag" % tag_name,
+            yield ("test_should_allow_%s_tag" % tag_name,
                    "<%s title=\"1\">foo &lt;bad&gt;bar&lt;/bad&gt; baz</%s>" % (tag_name, tag_name),
                    "<%s title='1'>foo <bad>bar</bad> baz</%s>" % (tag_name, tag_name))
 
@@ -93,7 +84,7 @@ def test_sanitizer():
         attribute_value = 'foo'
         if attribute_name in sanitizer.attr_val_is_uri:
             attribute_value = '%s://sub.domain.tld/path/object.ext' % sanitizer.allowed_protocols[0]
-        yield (runSanitizerTest, "test_should_allow_%s_attribute" % attribute_name,
+        yield ("test_should_allow_%s_attribute" % attribute_name,
                "<p %s=\"%s\">foo &lt;bad&gt;bar&lt;/bad&gt; baz</p>" % (attribute_name, attribute_value),
                "<p %s='%s'>foo <bad>bar</bad> baz</p>" % (attribute_name, attribute_value))
 
@@ -101,7 +92,7 @@ def test_sanitizer():
         rest_of_uri = '//sub.domain.tld/path/object.ext'
         if protocol == 'data':
             rest_of_uri = 'image/png;base64,aGVsbG8gd29ybGQ='
-        yield (runSanitizerTest, "test_should_allow_uppercase_%s_uris" % protocol,
+        yield ("test_should_allow_uppercase_%s_uris" % protocol,
                "<img src=\"%s:%s\">foo</a>" % (protocol, rest_of_uri),
                """<img src="%s:%s">foo</a>""" % (protocol, rest_of_uri))
 
@@ -110,11 +101,26 @@ def test_sanitizer():
         if protocol == 'data':
             rest_of_uri = 'image/png;base64,aGVsbG8gd29ybGQ='
         protocol = protocol.upper()
-        yield (runSanitizerTest, "test_should_allow_uppercase_%s_uris" % protocol,
+        yield ("test_should_allow_uppercase_%s_uris" % protocol,
                "<img src=\"%s:%s\">foo</a>" % (protocol, rest_of_uri),
                """<img src="%s:%s">foo</a>""" % (protocol, rest_of_uri))
 
 
+@pytest.mark.parametrize("expected, input",
+                         (pytest.param(expected, input, id=id)
+                          for id, expected, input in param_sanitizer()))
+def test_sanitizer(expected, input):
+    parsed = parseFragment(expected)
+    expected = serialize(parsed,
+                         omit_optional_tags=False,
+                         use_trailing_solidus=True,
+                         space_before_trailing_solidus=False,
+                         quote_attr_values="always",
+                         quote_char='"',
+                         alphabetical_attributes=True)
+    assert expected == sanitize_html(input)
+
+
 def test_lowercase_color_codes_in_style():
     sanitized = sanitize_html("<p style=\"border: 1px solid #a2a2a2;\"></p>")
     expected = '<p style=\"border: 1px solid #a2a2a2;\"></p>'
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_serializer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_serializer.py
index 9333286ef14..bce62459056 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_serializer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_serializer.py
@@ -80,7 +80,7 @@ class JsonWalker(TreeWalker):
 
 
 def serialize_html(input, options):
-    options = dict([(str(k), v) for k, v in options.items()])
+    options = {str(k): v for k, v in options.items()}
     encoding = options.get("encoding", None)
     if "encoding" in options:
         del options["encoding"]
@@ -89,19 +89,6 @@ def serialize_html(input, options):
     return serializer.render(stream, encoding)
 
 
-def runSerializerTest(input, expected, options):
-    encoding = options.get("encoding", None)
-
-    if encoding:
-        expected = list(map(lambda x: x.encode(encoding), expected))
-
-    result = serialize_html(input, options)
-    if len(expected) == 1:
-        assert expected[0] == result, "Expected:\n%s\nActual:\n%s\nOptions:\n%s" % (expected[0], result, str(options))
-    elif result not in expected:
-        assert False, "Expected: %s, Received: %s" % (expected, result)
-
-
 def throwsWithLatin1(input):
     with pytest.raises(UnicodeEncodeError):
         serialize_html(input, {"encoding": "iso-8859-1"})
@@ -120,13 +107,13 @@ def testDoctypeSystemId():
 
 
 def testCdataCharacters():
-    runSerializerTest([["StartTag", "http://www.w3.org/1999/xhtml", "style", {}], ["Characters", "\u0101"]],
-                      ["<style>&amacr;"], {"encoding": "iso-8859-1"})
+    test_serializer([["StartTag", "http://www.w3.org/1999/xhtml", "style", {}], ["Characters", "\u0101"]],
+                    ["<style>&amacr;"], {"encoding": "iso-8859-1"})
 
 
 def testCharacters():
-    runSerializerTest([["Characters", "\u0101"]],
-                      ["&amacr;"], {"encoding": "iso-8859-1"})
+    test_serializer([["Characters", "\u0101"]],
+                    ["&amacr;"], {"encoding": "iso-8859-1"})
 
 
 def testStartTagName():
@@ -138,9 +125,9 @@ def testAttributeName():
 
 
 def testAttributeValue():
-    runSerializerTest([["StartTag", "http://www.w3.org/1999/xhtml", "span",
-                        [{"namespace": None, "name": "potato", "value": "\u0101"}]]],
-                      ["<span potato=&amacr;>"], {"encoding": "iso-8859-1"})
+    test_serializer([["StartTag", "http://www.w3.org/1999/xhtml", "span",
+                      [{"namespace": None, "name": "potato", "value": "\u0101"}]]],
+                    ["<span potato=&amacr;>"], {"encoding": "iso-8859-1"})
 
 
 def testEndTagName():
@@ -165,7 +152,7 @@ def testSpecQuoteAttribute(c):
     else:
         output_ = ['<span foo="%s">' % c]
     options_ = {"quote_attr_values": "spec"}
-    runSerializerTest(input_, output_, options_)
+    test_serializer(input_, output_, options_)
 
 
 @pytest.mark.parametrize("c", list("\t\n\u000C\x20\r\"'=<>`"
@@ -184,7 +171,7 @@ def testLegacyQuoteAttribute(c):
     else:
         output_ = ['<span foo="%s">' % c]
     options_ = {"quote_attr_values": "legacy"}
-    runSerializerTest(input_, output_, options_)
+    test_serializer(input_, output_, options_)
 
 
 @pytest.fixture
@@ -217,9 +204,23 @@ def testEntityNoResolve(lxml_parser):
     assert result == '<!DOCTYPE html SYSTEM "about:legacy-compat"><html>&beta;</html>'
 
 
-def test_serializer():
+def param_serializer():
     for filename in get_data_files('serializer-testdata', '*.test', os.path.dirname(__file__)):
         with open(filename) as fp:
             tests = json.load(fp)
             for test in tests['tests']:
-                yield runSerializerTest, test["input"], test["expected"], test.get("options", {})
+                yield test["input"], test["expected"], test.get("options", {})
+
+
+@pytest.mark.parametrize("input, expected, options", param_serializer())
+def test_serializer(input, expected, options):
+    encoding = options.get("encoding", None)
+
+    if encoding:
+        expected = list(map(lambda x: x.encode(encoding), expected))
+
+    result = serialize_html(input, options)
+    if len(expected) == 1:
+        assert expected[0] == result, "Expected:\n%s\nActual:\n%s\nOptions:\n%s" % (expected[0], result, str(options))
+    elif result not in expected:
+        assert False, "Expected: %s, Received: %s" % (expected, result)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_stream.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_stream.py
index 27c39538c8b..efe9b472f5f 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_stream.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_stream.py
@@ -308,9 +308,11 @@ def test_invalid_codepoints(inp, num):
                           ("'\\uD800\\uD800\\uD800'", 3),
                           ("'a\\uD800a\\uD800a\\uD800a'", 3),
                           ("'\\uDFFF\\uDBFF'", 2),
-                          pytest.mark.skipif(sys.maxunicode == 0xFFFF,
-                                             ("'\\uDBFF\\uDFFF'", 2),
-                                             reason="narrow Python")])
+                          pytest.param(
+                              "'\\uDBFF\\uDFFF'", 2,
+                              marks=pytest.mark.skipif(
+                                  sys.maxunicode == 0xFFFF,
+                                  reason="narrow Python"))])
 def test_invalid_codepoints_surrogates(inp, num):
     inp = eval(inp)  # pylint:disable=eval-used
     fp = StringIO(inp)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_tokenizer2.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_tokenizer2.py
new file mode 100644
index 00000000000..158d847a26d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_tokenizer2.py
@@ -0,0 +1,66 @@
+from __future__ import absolute_import, division, unicode_literals
+
+import io
+
+from six import unichr, text_type
+
+from html5lib._tokenizer import HTMLTokenizer
+from html5lib.constants import tokenTypes
+
+
+def ignore_parse_errors(toks):
+    for tok in toks:
+        if tok['type'] != tokenTypes['ParseError']:
+            yield tok
+
+
+def test_maintain_attribute_order():
+    # generate loads to maximize the chance a hash-based mutation will occur
+    attrs = [(unichr(x), text_type(i)) for i, x in enumerate(range(ord('a'), ord('z')))]
+    stream = io.StringIO("<span " + " ".join("%s='%s'" % (x, i) for x, i in attrs) + ">")
+
+    toks = HTMLTokenizer(stream)
+    out = list(ignore_parse_errors(toks))
+
+    assert len(out) == 1
+    assert out[0]['type'] == tokenTypes['StartTag']
+
+    attrs_tok = out[0]['data']
+    assert len(attrs_tok) == len(attrs)
+
+    for (in_name, in_value), (out_name, out_value) in zip(attrs, attrs_tok.items()):
+        assert in_name == out_name
+        assert in_value == out_value
+
+
+def test_duplicate_attribute():
+    stream = io.StringIO("<span a=1 a=2 a=3>")
+
+    toks = HTMLTokenizer(stream)
+    out = list(ignore_parse_errors(toks))
+
+    assert len(out) == 1
+    assert out[0]['type'] == tokenTypes['StartTag']
+
+    attrs_tok = out[0]['data']
+    assert len(attrs_tok) == 1
+    assert list(attrs_tok.items()) == [('a', '1')]
+
+
+def test_maintain_duplicate_attribute_order():
+    # generate loads to maximize the chance a hash-based mutation will occur
+    attrs = [(unichr(x), text_type(i)) for i, x in enumerate(range(ord('a'), ord('z')))]
+    stream = io.StringIO("<span " + " ".join("%s='%s'" % (x, i) for x, i in attrs) + " a=100>")
+
+    toks = HTMLTokenizer(stream)
+    out = list(ignore_parse_errors(toks))
+
+    assert len(out) == 1
+    assert out[0]['type'] == tokenTypes['StartTag']
+
+    attrs_tok = out[0]['data']
+    assert len(attrs_tok) == len(attrs)
+
+    for (in_name, in_value), (out_name, out_value) in zip(attrs, attrs_tok.items()):
+        assert in_name == out_name
+        assert in_value == out_value
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_treewalkers.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_treewalkers.py
index 67fc89e55f3..780ca964ba4 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_treewalkers.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/test_treewalkers.py
@@ -1,7 +1,9 @@
 from __future__ import absolute_import, division, unicode_literals
 
 import itertools
+import sys
 
+from six import unichr, text_type
 import pytest
 
 try:
@@ -61,24 +63,7 @@ def set_attribute_on_first_child(docfrag, name, value, treeName):
         setter['ElementTree'](docfrag)(name, value)
 
 
-def runTreewalkerEditTest(intext, expected, attrs_to_add, tree):
-    """tests what happens when we add attributes to the intext"""
-    treeName, treeClass = tree
-    if treeClass is None:
-        pytest.skip("Treebuilder not loaded")
-    parser = html5parser.HTMLParser(tree=treeClass["builder"])
-    document = parser.parseFragment(intext)
-    for nom, val in attrs_to_add:
-        set_attribute_on_first_child(document, nom, val, treeName)
-
-    document = treeClass.get("adapter", lambda x: x)(document)
-    output = treewalkers.pprint(treeClass["walker"](document))
-    output = attrlist.sub(sortattrs, output)
-    if output not in expected:
-        raise AssertionError("TreewalkerEditTest: %s\nExpected:\n%s\nReceived:\n%s" % (treeName, expected, output))
-
-
-def test_treewalker_six_mix():
+def param_treewalker_six_mix():
     """Str/Unicode mix. If str attrs added to tree"""
 
     # On Python 2.x string literals are of type str. Unless, like this
@@ -99,7 +84,25 @@ def test_treewalker_six_mix():
 
     for tree in sorted(treeTypes.items()):
         for intext, attrs, expected in sm_tests:
-            yield runTreewalkerEditTest, intext, expected, attrs, tree
+            yield intext, expected, attrs, tree
+
+
+@pytest.mark.parametrize("intext, expected, attrs_to_add, tree", param_treewalker_six_mix())
+def test_treewalker_six_mix(intext, expected, attrs_to_add, tree):
+    """tests what happens when we add attributes to the intext"""
+    treeName, treeClass = tree
+    if treeClass is None:
+        pytest.skip("Treebuilder not loaded")
+    parser = html5parser.HTMLParser(tree=treeClass["builder"])
+    document = parser.parseFragment(intext)
+    for nom, val in attrs_to_add:
+        set_attribute_on_first_child(document, nom, val, treeName)
+
+    document = treeClass.get("adapter", lambda x: x)(document)
+    output = treewalkers.pprint(treeClass["walker"](document))
+    output = attrlist.sub(sortattrs, output)
+    if output not in expected:
+        raise AssertionError("TreewalkerEditTest: %s\nExpected:\n%s\nReceived:\n%s" % (treeName, expected, output))
 
 
 @pytest.mark.parametrize("tree,char", itertools.product(sorted(treeTypes.items()), ["x", "\u1234"]))
@@ -134,3 +137,69 @@ def test_lxml_xml():
     output = Lint(walker(lxmltree))
 
     assert list(output) == expected
+
+
+@pytest.mark.parametrize("treeName",
+                         [pytest.param(treeName, marks=[getattr(pytest.mark, treeName),
+                                                        pytest.mark.skipif(
+                                                            treeName != "lxml" or
+                                                            sys.version_info < (3, 7), reason="dict order undef")])
+                          for treeName in sorted(treeTypes.keys())])
+def test_maintain_attribute_order(treeName):
+    treeAPIs = treeTypes[treeName]
+    if treeAPIs is None:
+        pytest.skip("Treebuilder not loaded")
+
+    # generate loads to maximize the chance a hash-based mutation will occur
+    attrs = [(unichr(x), text_type(i)) for i, x in enumerate(range(ord('a'), ord('z')))]
+    data = "<span " + " ".join("%s='%s'" % (x, i) for x, i in attrs) + ">"
+
+    parser = html5parser.HTMLParser(tree=treeAPIs["builder"])
+    document = parser.parseFragment(data)
+
+    document = treeAPIs.get("adapter", lambda x: x)(document)
+    output = list(Lint(treeAPIs["walker"](document)))
+
+    assert len(output) == 2
+    assert output[0]['type'] == 'StartTag'
+    assert output[1]['type'] == "EndTag"
+
+    attrs_out = output[0]['data']
+    assert len(attrs) == len(attrs_out)
+
+    for (in_name, in_value), (out_name, out_value) in zip(attrs, attrs_out.items()):
+        assert (None, in_name) == out_name
+        assert in_value == out_value
+
+
+@pytest.mark.parametrize("treeName",
+                         [pytest.param(treeName, marks=[getattr(pytest.mark, treeName),
+                                                        pytest.mark.skipif(
+                                                            treeName != "lxml" or
+                                                            sys.version_info < (3, 7), reason="dict order undef")])
+                          for treeName in sorted(treeTypes.keys())])
+def test_maintain_attribute_order_adjusted(treeName):
+    treeAPIs = treeTypes[treeName]
+    if treeAPIs is None:
+        pytest.skip("Treebuilder not loaded")
+
+    # generate loads to maximize the chance a hash-based mutation will occur
+    data = "<svg a=1 refx=2 b=3 xml:lang=4 c=5>"
+
+    parser = html5parser.HTMLParser(tree=treeAPIs["builder"])
+    document = parser.parseFragment(data)
+
+    document = treeAPIs.get("adapter", lambda x: x)(document)
+    output = list(Lint(treeAPIs["walker"](document)))
+
+    assert len(output) == 2
+    assert output[0]['type'] == 'StartTag'
+    assert output[1]['type'] == "EndTag"
+
+    attrs_out = output[0]['data']
+
+    assert list(attrs_out.items()) == [((None, 'a'), '1'),
+                                       ((None, 'refX'), '2'),
+                                       ((None, 'b'), '3'),
+                                       (('http://www.w3.org/XML/1998/namespace', 'lang'), '4'),
+                                       ((None, 'c'), '5')]
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizer.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizer.py
index 1440a722cb8..47264cc3258 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizer.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizer.py
@@ -28,7 +28,7 @@ class TokenizerTestParser(object):
             tokenizer.currentToken = {"type": "startTag",
                                       "name": self._lastStartTag}
 
-        types = dict((v, k) for k, v in constants.tokenTypes.items())
+        types = {v: k for k, v in constants.tokenTypes.items()}
         for token in tokenizer:
             getattr(self, 'process%s' % types[token["type"]])(token)
 
@@ -40,7 +40,7 @@ class TokenizerTestParser(object):
 
     def processStartTag(self, token):
         self.outputTokens.append(["StartTag", token["name"],
-                                  dict(token["data"][::-1]), token["selfClosing"]])
+                                  token["data"], token["selfClosing"]])
 
     def processEmptyTag(self, token):
         if token["name"] not in constants.voidElements:
@@ -176,6 +176,7 @@ def unescape(test):
 def _doCapitalize(match):
     return match.group(1).upper()
 
+
 _capitalizeRe = re.compile(r"\W+(\w)").sub
 
 
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizertotree.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizertotree.py
index b841c76ce41..8528e8766a5 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizertotree.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tokenizertotree.py
@@ -64,5 +64,6 @@ def make_test(test_data):
     rv.append("")
     return "\n".join(rv)
 
+
 if __name__ == "__main__":
     main(sys.argv[1])
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tree_construction.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tree_construction.py
index c6e7ca09050..1ef6e7250c4 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tree_construction.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/tests/tree_construction.py
@@ -57,8 +57,6 @@ class TreeConstructionTest(pytest.Collector):
             item.add_marker(pytest.mark.parser)
             if namespaceHTMLElements:
                 item.add_marker(pytest.mark.namespaced)
-            if treeAPIs is None:
-                item.add_marker(pytest.mark.skipif(True, reason="Treebuilder not loaded"))
             yield item
 
     def _getTreeWalkerTests(self, treeName, treeAPIs):
@@ -69,26 +67,27 @@ class TreeConstructionTest(pytest.Collector):
                               treeAPIs)
         item.add_marker(getattr(pytest.mark, treeName))
         item.add_marker(pytest.mark.treewalker)
-        if treeAPIs is None:
-            item.add_marker(pytest.mark.skipif(True, reason="Treebuilder not loaded"))
         yield item
 
 
 def convertTreeDump(data):
     return "\n".join(convert(3)(data).split("\n")[1:])
 
+
 namespaceExpected = re.compile(r"^(\s*)<(\S+)>", re.M).sub
 
 
 class ParserTest(pytest.Item):
     def __init__(self, name, parent, test, treeClass, namespaceHTMLElements):
         super(ParserTest, self).__init__(name, parent)
-        self.obj = lambda: 1  # this is to hack around skipif needing a function!
         self.test = test
         self.treeClass = treeClass
         self.namespaceHTMLElements = namespaceHTMLElements
 
     def runtest(self):
+        if self.treeClass is None:
+            pytest.skip("Treebuilder not loaded")
+
         p = html5parser.HTMLParser(tree=self.treeClass,
                                    namespaceHTMLElements=self.namespaceHTMLElements)
 
@@ -146,11 +145,13 @@ class ParserTest(pytest.Item):
 class TreeWalkerTest(pytest.Item):
     def __init__(self, name, parent, test, treeAPIs):
         super(TreeWalkerTest, self).__init__(name, parent)
-        self.obj = lambda: 1  # this is to hack around skipif needing a function!
         self.test = test
         self.treeAPIs = treeAPIs
 
     def runtest(self):
+        if self.treeAPIs is None:
+            pytest.skip("Treebuilder not loaded")
+
         p = html5parser.HTMLParser(tree=self.treeAPIs["builder"])
 
         input = self.test['data']
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/base.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/base.py
index 05d97eccc89..e4a3d710d9a 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/base.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/base.py
@@ -10,9 +10,9 @@ Marker = None
 
 listElementsMap = {
     None: (frozenset(scopingElements), False),
-    "button": (frozenset(scopingElements | set([(namespaces["html"], "button")])), False),
-    "list": (frozenset(scopingElements | set([(namespaces["html"], "ol"),
-                                              (namespaces["html"], "ul")])), False),
+    "button": (frozenset(scopingElements | {(namespaces["html"], "button")}), False),
+    "list": (frozenset(scopingElements | {(namespaces["html"], "ol"),
+                                          (namespaces["html"], "ul")}), False),
     "table": (frozenset([(namespaces["html"], "html"),
                          (namespaces["html"], "table")]), False),
     "select": (frozenset([(namespaces["html"], "optgroup"),
@@ -28,7 +28,7 @@ class Node(object):
         :arg name: The tag name associated with the node
 
         """
-        # The tag name assocaited with the node
+        # The tag name associated with the node
         self.name = name
         # The parent of the current node (or None for the document node)
         self.parent = None
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/dom.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/dom.py
index dcfac220bfa..d8b5300465b 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/dom.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/dom.py
@@ -1,7 +1,10 @@
 from __future__ import absolute_import, division, unicode_literals
 
 
-from collections import MutableMapping
+try:
+    from collections.abc import MutableMapping
+except ImportError:  # Python 2.7
+    from collections import MutableMapping
 from xml.dom import minidom, Node
 import weakref
 
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree.py
index cb1d4aef503..086bed4eed1 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree.py
@@ -5,6 +5,8 @@ from six import text_type
 
 import re
 
+from copy import copy
+
 from . import base
 from .. import _ihatexml
 from .. import constants
@@ -61,16 +63,17 @@ def getETreeBuilder(ElementTreeImplementation, fullTree=False):
             return self._element.attrib
 
         def _setAttributes(self, attributes):
-            # Delete existing attributes first
-            # XXX - there may be a better way to do this...
-            for key in list(self._element.attrib.keys()):
-                del self._element.attrib[key]
-            for key, value in attributes.items():
-                if isinstance(key, tuple):
-                    name = "{%s}%s" % (key[2], key[1])
-                else:
-                    name = key
-                self._element.set(name, value)
+            el_attrib = self._element.attrib
+            el_attrib.clear()
+            if attributes:
+                # calling .items _always_ allocates, and the above truthy check is cheaper than the
+                # allocation on average
+                for key, value in attributes.items():
+                    if isinstance(key, tuple):
+                        name = "{%s}%s" % (key[2], key[1])
+                    else:
+                        name = key
+                    el_attrib[name] = value
 
         attributes = property(_getAttributes, _setAttributes)
 
@@ -129,8 +132,8 @@ def getETreeBuilder(ElementTreeImplementation, fullTree=False):
 
         def cloneNode(self):
             element = type(self)(self.name, self.namespace)
-            for name, value in self.attributes.items():
-                element.attributes[name] = value
+            if self._element.attrib:
+                element._element.attrib = copy(self._element.attrib)
             return element
 
         def reparentChildren(self, newParent):
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree_lxml.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree_lxml.py
index ca12a99cccf..e73de61a853 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree_lxml.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treebuilders/etree_lxml.py
@@ -16,6 +16,11 @@ import warnings
 import re
 import sys
 
+try:
+    from collections.abc import MutableMapping
+except ImportError:
+    from collections import MutableMapping
+
 from . import base
 from ..constants import DataLossWarning
 from .. import constants
@@ -23,6 +28,7 @@ from . import etree as etree_builders
 from .. import _ihatexml
 
 import lxml.etree as etree
+from six import PY3, binary_type
 
 
 fullTree = True
@@ -44,7 +50,11 @@ class Document(object):
         self._childNodes = []
 
     def appendChild(self, element):
-        self._elementTree.getroot().addnext(element._element)
+        last = self._elementTree.getroot()
+        for last in self._elementTree.getroot().itersiblings():
+            pass
+
+        last.addnext(element._element)
 
     def _getChildNodes(self):
         return self._childNodes
@@ -185,26 +195,37 @@ class TreeBuilder(base.TreeBuilder):
         infosetFilter = self.infosetFilter = _ihatexml.InfosetFilter(preventDoubleDashComments=True)
         self.namespaceHTMLElements = namespaceHTMLElements
 
-        class Attributes(dict):
-            def __init__(self, element, value=None):
-                if value is None:
-                    value = {}
+        class Attributes(MutableMapping):
+            def __init__(self, element):
                 self._element = element
-                dict.__init__(self, value)  # pylint:disable=non-parent-init-called
-                for key, value in self.items():
-                    if isinstance(key, tuple):
-                        name = "{%s}%s" % (key[2], infosetFilter.coerceAttribute(key[1]))
-                    else:
-                        name = infosetFilter.coerceAttribute(key)
-                    self._element._element.attrib[name] = value
 
-            def __setitem__(self, key, value):
-                dict.__setitem__(self, key, value)
+            def _coerceKey(self, key):
                 if isinstance(key, tuple):
                     name = "{%s}%s" % (key[2], infosetFilter.coerceAttribute(key[1]))
                 else:
                     name = infosetFilter.coerceAttribute(key)
-                self._element._element.attrib[name] = value
+                return name
+
+            def __getitem__(self, key):
+                value = self._element._element.attrib[self._coerceKey(key)]
+                if not PY3 and isinstance(value, binary_type):
+                    value = value.decode("ascii")
+                return value
+
+            def __setitem__(self, key, value):
+                self._element._element.attrib[self._coerceKey(key)] = value
+
+            def __delitem__(self, key):
+                del self._element._element.attrib[self._coerceKey(key)]
+
+            def __iter__(self):
+                return iter(self._element._element.attrib)
+
+            def __len__(self):
+                return len(self._element._element.attrib)
+
+            def clear(self):
+                return self._element._element.attrib.clear()
 
         class Element(builder.Element):
             def __init__(self, name, namespace):
@@ -225,8 +246,10 @@ class TreeBuilder(base.TreeBuilder):
             def _getAttributes(self):
                 return self._attributes
 
-            def _setAttributes(self, attributes):
-                self._attributes = Attributes(self, attributes)
+            def _setAttributes(self, value):
+                attributes = self.attributes
+                attributes.clear()
+                attributes.update(value)
 
             attributes = property(_getAttributes, _setAttributes)
 
@@ -234,8 +257,11 @@ class TreeBuilder(base.TreeBuilder):
                 data = infosetFilter.coerceCharacters(data)
                 builder.Element.insertText(self, data, insertBefore)
 
-            def appendChild(self, child):
-                builder.Element.appendChild(self, child)
+            def cloneNode(self):
+                element = type(self)(self.name, self.namespace)
+                if self._element.attrib:
+                    element._element.attrib.update(self._element.attrib)
+                return element
 
         class Comment(builder.Comment):
             def __init__(self, data):
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/__init__.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/__init__.py
index 9bec2076f3f..b2d3aac3137 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/__init__.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/__init__.py
@@ -2,10 +2,10 @@
 tree, generating tokens identical to those produced by the tokenizer
 module.
 
-To create a tree walker for a new type of tree, you need to do
+To create a tree walker for a new type of tree, you need to
 implement a tree walker object (called TreeWalker by convention) that
-implements a 'serialize' method taking a tree as sole argument and
-returning an iterator generating tokens.
+implements a 'serialize' method which takes a tree as sole argument and
+returns an iterator which generates tokens.
 """
 
 from __future__ import absolute_import, division, unicode_literals
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree.py
index d15a7eebfe8..44653372d6b 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree.py
@@ -127,4 +127,5 @@ def getETreeBuilder(ElementTreeImplementation):
 
     return locals()
 
+
 getETreeModule = moduleFactoryFactory(getETreeBuilder)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree_lxml.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree_lxml.py
index fb2363112b1..a614ac5b3f7 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree_lxml.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/html5lib/treewalkers/etree_lxml.py
@@ -1,6 +1,8 @@
 from __future__ import absolute_import, division, unicode_literals
 from six import text_type
 
+from collections import OrderedDict
+
 from lxml import etree
 from ..treebuilders.etree import tag_regexp
 
@@ -163,7 +165,7 @@ class TreeWalker(base.NonRecursiveTreeWalker):
             else:
                 namespace = None
                 tag = ensure_str(node.tag)
-            attrs = {}
+            attrs = OrderedDict()
             for name, value in list(node.attrib.items()):
                 name = ensure_str(name)
                 value = ensure_str(value)
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/parse.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/parse.py
index 3e65c330d92..e6806b4607d 100755
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/parse.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/parse.py
@@ -1,12 +1,11 @@
 #!/usr/bin/env python
-"""usage: %prog [options] filename
-
+"""
 Parse a document to a tree, with optional profiling
 """
 
+import argparse
 import sys
 import traceback
-from optparse import OptionParser
 
 from html5lib import html5parser
 from html5lib import treebuilders, serializer, treewalkers
@@ -15,12 +14,12 @@ from html5lib import _utils
 
 
 def parse():
-    optParser = getOptParser()
-    opts, args = optParser.parse_args()
+    parser = get_parser()
+    opts = parser.parse_args()
     encoding = "utf8"
 
     try:
-        f = args[-1]
+        f = opts.filename
         # Try opening from the internet
         if f.startswith('http://'):
             try:
@@ -33,7 +32,7 @@ def parse():
                 if contentType:
                     (mediaType, params) = cgi.parse_header(contentType)
                     encoding = params.get('charset')
-            except:
+            except Exception:
                 pass
         elif f == '-':
             f = sys.stdin
@@ -94,7 +93,7 @@ def parse():
 def run(parseMethod, f, encoding, scripting):
     try:
         document = parseMethod(f, override_encoding=encoding, scripting=scripting)
-    except:
+    except Exception:
         document = None
         traceback.print_exc()
     return document
@@ -127,7 +126,7 @@ def printOutput(parser, document, opts):
             for opt in serializer.HTMLSerializer.options:
                 try:
                     kwargs[opt] = getattr(opts, opt)
-                except:
+                except Exception:
                     pass
             if not kwargs['quote_char']:
                 del kwargs['quote_char']
@@ -151,94 +150,87 @@ def printOutput(parser, document, opts):
         sys.stdout.write("\nParse errors:\n" + "\n".join(errList) + "\n")
 
 
-def getOptParser():
-    parser = OptionParser(usage=__doc__)
+def get_parser():
+    parser = argparse.ArgumentParser(description=__doc__)
 
-    parser.add_option("-p", "--profile", action="store_true", default=False,
-                      dest="profile", help="Use the hotshot profiler to "
-                      "produce a detailed log of the run")
+    parser.add_argument("-p", "--profile", action="store_true",
+                        help="Use the hotshot profiler to "
+                        "produce a detailed log of the run")
 
-    parser.add_option("-t", "--time",
-                      action="store_true", default=False, dest="time",
-                      help="Time the run using time.time (may not be accurate on all platforms, especially for short runs)")
+    parser.add_argument("-t", "--time",
+                        action="store_true",
+                        help="Time the run using time.time (may not be accurate on all platforms, especially for short runs)")
 
-    parser.add_option("-b", "--treebuilder", action="store", type="string",
-                      dest="treebuilder", default="etree")
+    parser.add_argument("-b", "--treebuilder",
+                        default="etree")
 
-    parser.add_option("-e", "--error", action="store_true", default=False,
-                      dest="error", help="Print a list of parse errors")
+    parser.add_argument("-e", "--error", action="store_true",
+                        help="Print a list of parse errors")
 
-    parser.add_option("-f", "--fragment", action="store_true", default=False,
-                      dest="fragment", help="Parse as a fragment")
+    parser.add_argument("-f", "--fragment", action="store_true",
+                        help="Parse as a fragment")
 
-    parser.add_option("-s", "--scripting", action="store_true", default=False,
-                      dest="scripting", help="Handle noscript tags as if scripting was enabled")
+    parser.add_argument("-s", "--scripting", action="store_true",
+                        help="Handle noscript tags as if scripting was enabled")
 
-    parser.add_option("", "--tree", action="store_true", default=False,
-                      dest="tree", help="Output as debug tree")
+    parser.add_argument("--tree", action="store_true",
+                        help="Output as debug tree")
 
-    parser.add_option("-x", "--xml", action="store_true", default=False,
-                      dest="xml", help="Output as xml")
+    parser.add_argument("-x", "--xml", action="store_true",
+                        help="Output as xml")
 
-    parser.add_option("", "--no-html", action="store_false", default=True,
-                      dest="html", help="Don't output html")
+    parser.add_argument("--no-html", action="store_false",
+                        dest="html", help="Don't output html")
 
-    parser.add_option("-c", "--encoding", action="store_true", default=False,
-                      dest="encoding", help="Print character encoding used")
+    parser.add_argument("-c", "--encoding", action="store_true",
+                        help="Print character encoding used")
 
-    parser.add_option("", "--inject-meta-charset", action="store_true",
-                      default=False, dest="inject_meta_charset",
-                      help="inject <meta charset>")
+    parser.add_argument("--inject-meta-charset", action="store_true",
+                        help="inject <meta charset>")
 
-    parser.add_option("", "--strip-whitespace", action="store_true",
-                      default=False, dest="strip_whitespace",
-                      help="strip whitespace")
+    parser.add_argument("--strip-whitespace", action="store_true",
+                        help="strip whitespace")
 
-    parser.add_option("", "--omit-optional-tags", action="store_true",
-                      default=False, dest="omit_optional_tags",
-                      help="omit optional tags")
+    parser.add_argument("--omit-optional-tags", action="store_true",
+                        help="omit optional tags")
 
-    parser.add_option("", "--quote-attr-values", action="store_true",
-                      default=False, dest="quote_attr_values",
-                      help="quote attribute values")
+    parser.add_argument("--quote-attr-values", action="store_true",
+                        help="quote attribute values")
 
-    parser.add_option("", "--use-best-quote-char", action="store_true",
-                      default=False, dest="use_best_quote_char",
-                      help="use best quote character")
+    parser.add_argument("--use-best-quote-char", action="store_true",
+                        help="use best quote character")
 
-    parser.add_option("", "--quote-char", action="store",
-                      default=None, dest="quote_char",
-                      help="quote character")
+    parser.add_argument("--quote-char",
+                        help="quote character")
 
-    parser.add_option("", "--no-minimize-boolean-attributes",
-                      action="store_false", default=True,
-                      dest="minimize_boolean_attributes",
-                      help="minimize boolean attributes")
+    parser.add_argument("--no-minimize-boolean-attributes",
+                        action="store_false",
+                        dest="minimize_boolean_attributes",
+                        help="minimize boolean attributes")
 
-    parser.add_option("", "--use-trailing-solidus", action="store_true",
-                      default=False, dest="use_trailing_solidus",
-                      help="use trailing solidus")
+    parser.add_argument("--use-trailing-solidus", action="store_true",
+                        help="use trailing solidus")
 
-    parser.add_option("", "--space-before-trailing-solidus",
-                      action="store_true", default=False,
-                      dest="space_before_trailing_solidus",
-                      help="add space before trailing solidus")
+    parser.add_argument("--space-before-trailing-solidus",
+                        action="store_true",
+                        help="add space before trailing solidus")
 
-    parser.add_option("", "--escape-lt-in-attrs", action="store_true",
-                      default=False, dest="escape_lt_in_attrs",
-                      help="escape less than signs in attribute values")
+    parser.add_argument("--escape-lt-in-attrs", action="store_true",
+                        help="escape less than signs in attribute values")
 
-    parser.add_option("", "--escape-rcdata", action="store_true",
-                      default=False, dest="escape_rcdata",
-                      help="escape rcdata element values")
+    parser.add_argument("--escape-rcdata", action="store_true",
+                        help="escape rcdata element values")
 
-    parser.add_option("", "--sanitize", action="store_true", default=False,
-                      dest="sanitize", help="sanitize")
+    parser.add_argument("--sanitize", action="store_true",
+                        help="sanitize")
 
-    parser.add_option("-l", "--log", action="store_true", default=False,
-                      dest="log", help="log state transitions")
+    parser.add_argument("-l", "--log", action="store_true",
+                        help="log state transitions")
+
+    parser.add_argument("filename")
 
     return parser
 
+
 if __name__ == "__main__":
     parse()
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-optional.txt b/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-optional.txt
index c00fd242f6f..2e78c952c1c 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-optional.txt
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-optional.txt
@@ -11,7 +11,3 @@ chardet>=2.2
 # lxml is supported with its own treebuilder ("lxml") and otherwise
 # uses the standard ElementTree support
 lxml ; platform_python_implementation == 'CPython'
-
-# DATrie can be used in place of our Python trie implementation for
-# slightly better parsing performance.
-datrie ; platform_python_implementation == 'CPython'
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-test.txt b/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-test.txt
index 4e223a3fde1..703d0e690f4 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-test.txt
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/requirements-test.txt
@@ -1,10 +1,10 @@
 -r requirements.txt
 
-tox
-
-flake8<3.0
-
-pytest==3.2.5
-coverage
-pytest-expect>=1.1,<2.0
-mock
+tox>=3.15.1,<4
+flake8>=3.8.1,<3.9
+pytest>=4.6.10,<5 ; python_version < '3'
+pytest>=5.4.2,<6 ; python_version >= '3'
+coverage>=5.1,<6
+pytest-expect>=1.1.0,<2
+mock>=3.0.5,<4 ; python_version < '3.6'
+mock>=4.0.2,<5 ; python_version >= '3.6'
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.cfg b/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.cfg
index d309fdaa3f4..0b2bb9c79b7 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.cfg
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.cfg
@@ -7,8 +7,5 @@ max-line-length = 139
 exclude = .git,__pycache__,.tox,doc
 
 [flake8]
-ignore = N
+ignore = N, W504
 max-line-length = 139
-
-[metadata]
-license_file = LICENSE
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.py
index 3e413f2a933..f84c1284967 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/setup.py
@@ -46,7 +46,7 @@ if _markerlib and sys.version_info[0] == 3:
 
     _markerlib.default_environment = default_environment
 
-# Avoid the very buggy pkg_resources.parser, which doesnt consistently
+# Avoid the very buggy pkg_resources.parser, which doesn't consistently
 # recognise the markers needed by this setup.py
 # Change this to setuptools 20.10.0 to support all markers.
 if pkg_resources:
@@ -66,10 +66,12 @@ classifiers = [
     'Programming Language :: Python :: 2',
     'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.3',
-    'Programming Language :: Python :: 3.4',
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: Implementation :: CPython',
+    'Programming Language :: Python :: Implementation :: PyPy',
     'Topic :: Software Development :: Libraries :: Python Modules',
     'Topic :: Text Processing :: Markup :: HTML'
 ]
@@ -105,10 +107,10 @@ setup(name='html5lib',
           'six>=1.9',
           'webencodings',
       ],
+      python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
       extras_require={
           # A conditional extra will only install these items when the extra is
           # requested and the condition matches.
-          "datrie:platform_python_implementation == 'CPython'": ["datrie"],
           "lxml:platform_python_implementation == 'CPython'": ["lxml"],
 
           # Standard extras, will be installed when the extra is requested.
@@ -120,6 +122,6 @@ setup(name='html5lib',
           # extra that will be installed whenever the condition matches and the
           # all extra is requested.
           "all": ["genshi", "chardet>=2.2"],
-          "all:platform_python_implementation == 'CPython'": ["datrie", "lxml"],
+          "all:platform_python_implementation == 'CPython'": ["lxml"],
       },
       )
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/tox.ini b/tests/wpt/web-platform-tests/tools/third_party/html5lib/tox.ini
index e07ef670cef..58758cea13c 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/tox.ini
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py27,py33,py34,py35,py36,pypy}-{base,six19,optional}
+envlist = py{27,35,36,37,38,py,py3}-{base,six19,optional}
 
 [testenv]
 deps =
@@ -18,6 +18,3 @@ commands =
 [testenv:doc]
 changedir = doc
 commands = sphinx-build -b html . _build
-
-[flake8]
-exclude = ./.tox
diff --git a/tests/wpt/web-platform-tests/tools/third_party/html5lib/utils/entities.py b/tests/wpt/web-platform-tests/tools/third_party/html5lib/utils/entities.py
index 6dccf5f0bfd..6e8ca458060 100644
--- a/tests/wpt/web-platform-tests/tools/third_party/html5lib/utils/entities.py
+++ b/tests/wpt/web-platform-tests/tools/third_party/html5lib/utils/entities.py
@@ -8,10 +8,10 @@ def parse(path="html5ents.xml"):
 
 
 def entity_table(tree):
-    return dict((entity_name("".join(tr[0].xpath(".//text()"))),
-                 entity_characters(tr[1].text))
-                for tr in tree.xpath("//h:tbody/h:tr",
-                                     namespaces={"h": "http://www.w3.org/1999/xhtml"}))
+    return {entity_name("".join(tr[0].xpath(".//text()"))):
+            entity_characters(tr[1].text)
+            for tr in tree.xpath("//h:tbody/h:tr",
+                                 namespaces={"h": "http://www.w3.org/1999/xhtml"})}
 
 
 def entity_name(inp):
@@ -96,5 +96,6 @@ def main():
     code = make_entities_code(entities)
     open("entities_constants.py", "w").write(code)
 
+
 if __name__ == "__main__":
     main()
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
index d1d733b86b2..8ac1d9f78b0 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
@@ -1,4 +1,4 @@
-html5lib==1.0.1
+html5lib==1.1
 mozinfo==1.2.1  # https://bugzilla.mozilla.org/show_bug.cgi?id=1621226
 mozlog==6.0
 mozdebug==0.2
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry-different-function-realm.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry-different-function-realm.html
new file mode 100644
index 00000000000..3af3dd924fb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry-different-function-realm.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Entry settings object for host functions when the function realm is different from the test realm</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<!-- This is what would normally be considered the entry page. However, we use functions from the
+     resources/function/function.html realm. So window.open() should resolve relative to that realm
+     inside host functions. -->
+
+<iframe src="resources/entry-incumbent.html"></iframe>
+<iframe src="resources/function/function.html" id="function-frame"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+const relativeURL = "resources/window-to-open.html";
+const expectedURL = (new URL(relativeURL, document.querySelector("#function-frame").src)).href;
+
+const incumbentWindow = frames[0];
+const functionWindow = frames[1];
+const FunctionFromAnotherWindow = functionWindow.Function;
+
+window.onload = () => {
+  async_test(t => {
+    t.add_cleanup(() => { delete functionWindow.args; });
+    functionWindow.args = [incumbentWindow, relativeURL, t, assert_equals, expectedURL];
+
+    const func = FunctionFromAnotherWindow(`
+      const [incumbentWindow, relativeURL, t, assert_equals, expectedURL] = window.args;
+
+      const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+      w.onload = t.step_func_done(() => {
+        t.add_cleanup(() => w.close());
+        assert_equals(w.location.href, expectedURL);
+      });
+    `);
+    call_later(func);
+  }, "Start function");
+
+  done();
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry.html
new file mode 100644
index 00000000000..15018074491
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/entry.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Entry settings object for host functions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<!-- This is the entry page, so window.open() should resolve relative to it, even inside host functions. -->
+
+<iframe src="resources/entry-incumbent.html"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+const relativeURL = "resources/window-to-open.html";
+const expectedURL = (new URL(relativeURL, location.href)).href;
+
+const incumbentWindow = frames[0];
+
+window.onload = () => {
+  async_test(t => {
+    const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+    w.onload = t.step_func_done(() => {
+      t.add_cleanup(() => w.close());
+      assert_equals(w.location.href, expectedURL);
+    });
+  }, "Sanity check: this all works as expected synchronously");
+
+  async_test(t => {
+    // No t.step_func because that could change the realms
+    call_later(() => {
+      const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+      w.onload = t.step_func_done(() => {
+        t.add_cleanup(() => w.close());
+        assert_equals(w.location.href, expectedURL);
+      });
+    });
+  }, "Start function");
+
+  done();
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/helper.js b/tests/wpt/web-platform-tests/wasm/jsapi/functions/helper.js
new file mode 100644
index 00000000000..487791c69ad
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/helper.js
@@ -0,0 +1,12 @@
+function call_later(f) {
+  const builder = new WasmModuleBuilder();
+  const functionIndex = builder.addImport("module", "imported", kSig_v_v);
+  builder.addStart(functionIndex);
+  const buffer = builder.toBuffer();
+
+  WebAssembly.instantiate(buffer, {
+    "module": {
+      "imported": f,
+    }
+  });
+}
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/incumbent.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/incumbent.html
new file mode 100644
index 00000000000..cb276329770
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/incumbent.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent settings object for host functions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This is the entry page. -->
+
+<iframe src="resources/incumbent-incumbent.html"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+// postMessage should pick the incumbent page as its .source value to set on the MessageEvent, even
+// inside host functions.
+const expectedURL = (new URL("resources/incumbent-incumbent.html", location.href)).href;
+
+let testId = 0;
+
+window.onload = () => {
+  const relevantWindow = frames[0].document.querySelector("#r").contentWindow;
+
+  function setupTest(t) {
+    ++testId;
+    const thisTestId = testId;
+
+    relevantWindow.addEventListener("messagereceived", t.step_func(e => {
+      const [receivedTestId, receivedSourceURL] = e.detail;
+
+      if (receivedTestId !== thisTestId) {
+        return;
+      }
+
+      assert_equals(receivedSourceURL, expectedURL);
+      t.done();
+    }));
+
+    return thisTestId;
+  }
+
+  async_test(t => {
+    const thisTestId = setupTest(t);
+
+    frames[0].runWindowPostMessageVeryIndirectly(thisTestId, "*");
+  }, "Sanity check: this all works as expected synchronously");
+
+  async_test(t => {
+    const thisTestId = setupTest(t);
+    frames[0].runWindowPostMessageVeryIndirectlyWithNoUserCode(thisTestId, "*");
+  }, "Start function");
+
+  done();
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/README.md b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/README.md
new file mode 100644
index 00000000000..a89258a4e01
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/README.md
@@ -0,0 +1,5 @@
+A couple notes about the files scattered in this `resources/` directory:
+
+* The nested directory structure is necessary here so that relative URL resolution can be tested; we need different sub-paths for each document.
+
+* The semi-duplicate `window-to-open.html`s scattered throughout are present because Firefox, at least, does not fire `Window` `load` events for 404s, so we want to ensure that no matter which global is used, `window`'s `load` event is hit and our tests can proceed.
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/current.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/current.html
new file mode 100644
index 00000000000..63d9c437fc5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/current.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Current page used as a test helper</title>
+
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/resources/window-to-open.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/resources/window-to-open.html
new file mode 100644
index 00000000000..1bc4cca9a39
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/current/resources/window-to-open.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the current settings object is used this page will be opened</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/entry-incumbent.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/entry-incumbent.html
new file mode 100644
index 00000000000..6b210563e99
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/entry-incumbent.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="relevant/relevant.html" id="r"></iframe>
+<iframe src="current/current.html" id="c"></iframe>
+
+<script>
+const relevant = document.querySelector("#r");
+const current = document.querySelector("#c");
+
+window.runWindowOpenVeryIndirectly = (...args) => {
+  return current.contentWindow.open.call(relevant.contentWindow, ...args);
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/function.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/function.html
new file mode 100644
index 00000000000..979b902eaa0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/function.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Realm for a host function used as a test helper</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/resources/window-to-open.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/resources/window-to-open.html
new file mode 100644
index 00000000000..3928c1f8aa9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/function/resources/window-to-open.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the function's settings object is used this page will be opened</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/incumbent-incumbent.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/incumbent-incumbent.html
new file mode 100644
index 00000000000..5e84f65a084
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/incumbent-incumbent.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent page used as a test helper</title>
+
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<iframe src="relevant/relevant.html" id="r"></iframe>
+<iframe src="current/current.html" id="c"></iframe>
+
+<script>
+const relevant = document.querySelector("#r");
+const current = document.querySelector("#c");
+
+window.runWindowPostMessageVeryIndirectly = (...args) => {
+  return current.contentWindow.postMessage.call(relevant.contentWindow, ...args);
+};
+
+// This tests the backup incumbent settings object stack scenario, by avoiding putting user code on the stack.
+window.runWindowPostMessageVeryIndirectlyWithNoUserCode = (...args) => {
+  const runWindowPostMessage = current.contentWindow.postMessage.bind(relevant.contentWindow, ...args);
+  call_later(runWindowPostMessage);
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/relevant.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/relevant.html
new file mode 100644
index 00000000000..06df91c2374
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/relevant.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Relevant page used as a test helper</title>
+
+<script>
+// incumbent.html will end up posting a message to here. We need to signal back the "source".
+
+window.onmessage = e => {
+  const testId = e.data;
+  const sourceURL = e.source.document.URL;
+
+  window.dispatchEvent(new CustomEvent("messagereceived", { detail: [testId, sourceURL] }));
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/resources/window-to-open.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/resources/window-to-open.html
new file mode 100644
index 00000000000..4138b5a0844
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/relevant/resources/window-to-open.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the relevant settings object is used this page will be opened</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/resources/window-to-open.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/resources/window-to-open.html
new file mode 100644
index 00000000000..7743b9b5782
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/resources/window-to-open.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the incumbent settings object is used this page will be opened</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/window-to-open.html b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/window-to-open.html
new file mode 100644
index 00000000000..ce357937f5e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/functions/resources/window-to-open.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the entry settings object is used this page will be opened</title>
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/wasm-module-builder.js b/tests/wpt/web-platform-tests/wasm/jsapi/wasm-module-builder.js
index 82c6e04135f..25fb1c836b0 100644
--- a/tests/wpt/web-platform-tests/wasm/jsapi/wasm-module-builder.js
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/wasm-module-builder.js
@@ -3,10 +3,8 @@
 // found in the LICENSE file.
 
 // Used for encoding f32 and double constants to bits.
-let f32_view = new Float32Array(1);
-let f32_bytes_view = new Uint8Array(f32_view.buffer);
-let f64_view = new Float64Array(1);
-let f64_bytes_view = new Uint8Array(f64_view.buffer);
+let byte_view = new Uint8Array(8);
+let data_view = new DataView(byte_view.buffer);
 
 // The bytes function receives one of
 //  - several arguments, each of which is either a number or a string of length
@@ -1017,14 +1015,10 @@ class WasmModuleBuilder {
               section.emit_u64v(global.init);
               break;
             case kWasmF32:
-              section.emit_u8(kExprF32Const);
-              f32_view[0] = global.init;
-              section.emit_bytes(f32_bytes_view);
+              section.emit_bytes(wasmF32Const(global.init));
               break;
             case kWasmF64:
-              section.emit_u8(kExprF64Const);
-              f64_view[0] = global.init;
-              section.emit_bytes(f64_bytes_view);
+              section.emit_bytes(wasmF64Const(global.init));
               break;
             case kWasmAnyFunc:
             case kWasmAnyRef:
@@ -1322,18 +1316,18 @@ function wasmI32Const(val) {
 }
 
 function wasmF32Const(f) {
-  f32_view[0] = f;
+  // Write in little-endian order at offset 0.
+  data_view.setFloat32(0, f, true);
   return [
-    kExprF32Const, f32_bytes_view[0], f32_bytes_view[1], f32_bytes_view[2],
-    f32_bytes_view[3]
+    kExprF32Const, byte_view[0], byte_view[1], byte_view[2], byte_view[3]
   ];
 }
 
 function wasmF64Const(f) {
-  f64_view[0] = f;
+  // Write in little-endian order at offset 0.
+  data_view.setFloat64(0, f, true);
   return [
-    kExprF64Const, f64_bytes_view[0], f64_bytes_view[1], f64_bytes_view[2],
-    f64_bytes_view[3], f64_bytes_view[4], f64_bytes_view[5], f64_bytes_view[6],
-    f64_bytes_view[7]
+    kExprF64Const, byte_view[0], byte_view[1], byte_view[2],
+    byte_view[3], byte_view[4], byte_view[5], byte_view[6], byte_view[7]
   ];
 }