diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 879fcd99771..4ca855f9e22 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -143897,6 +143897,19 @@
        {}
       ]
      ],
+     "out-of-flow-in-multicolumn-116.html": [
+      "fac536a65b34163867de1aad2b7f7378046abb47",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "overflow-clip-000.html": [
       "72b10f5cdd3092a042f1f90bff04e9428d61608e",
       [
@@ -144718,6 +144731,19 @@
          {}
         ]
        ],
+       "background-001.tentative.html": [
+        "2084f4ad313ead2f0ae05288f7b83ef864383e37",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
        "balanced-inner-multicol.html": [
         "78340661eda23a2607275e890433c4d99c2c1d3e",
         [
@@ -189857,32 +189883,6 @@
         {}
        ]
       ],
-      "image-set-invalid-resolution-rendering-2.html": [
-       "c8b560b7fcb3773947ea6c443441fe4397d3bf8e",
-       [
-        null,
-        [
-         [
-          "/css/css-images/image-set/reference/image-set-rendering-ref.html",
-          "=="
-         ]
-        ],
-        {}
-       ]
-      ],
-      "image-set-invalid-resolution-rendering.html": [
-       "91aeaccebdc323a45240ab971989fe1f6464f46b",
-       [
-        null,
-        [
-         [
-          "/css/css-images/image-set/reference/image-set-rendering-ref.html",
-          "=="
-         ]
-        ],
-        {}
-       ]
-      ],
       "image-set-linear-gradient-rendering.html": [
        "2fc31b95a81e3c46fde0f42edcaad04c1ed6f1b9",
        [
@@ -190155,6 +190155,32 @@
         ],
         {}
        ]
+      ],
+      "image-set-zero-resolution-rendering-2.html": [
+       "5c835a3fbcc8b4304d4bf13ff4bd037d8f518dd7",
+       [
+        null,
+        [
+         [
+          "/css/css-images/image-set/reference/image-set-rendering-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "image-set-zero-resolution-rendering.html": [
+       "d7e4eb7fdc25af16c17e9e7549f67389afea3285",
+       [
+        null,
+        [
+         [
+          "/css/css-images/image-set/reference/image-set-rendering-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "infinite-radial-gradient-refcrash.html": [
@@ -207872,7 +207898,7 @@
       ]
      ],
      "nesting-basic.html": [
-      "dde3ebbcfdb8d268d22fa8ce6940655808c0a202",
+      "19ff48e4a29588e48eb19570149ad7525827cd8c",
       [
        null,
        [
@@ -309772,7 +309798,7 @@
        ]
       ],
       "popover-backdrop-appearance.html": [
-       "c71e148644b0edb5064b46a01debb37945913818",
+       "cf57aee69e3d4fe332acc63873fa853b2555c813",
        [
         null,
         [
@@ -321617,7 +321643,7 @@
       []
      ],
      "support.js": [
-      "18ed971ad7cb886caee0142e830f25e13f8354ac",
+      "5036e50466578be3ec9e4f9596cb4146cf481cf8",
       []
      ]
     },
@@ -385323,7 +385349,7 @@
       []
      ],
      "nesting-basic-ref.html": [
-      "8825ad47d277feb6e64fde381107833e84ccbc56",
+      "8038f369cde2b496106223551ab9441a79d2621e",
       []
      ],
      "supports-is-consistent-ref.html": [
@@ -420695,7 +420721,7 @@
         []
        ],
        "popover-utils.js": [
-        "0df24ccd4fc936d0a2effb3d9b1e28d5a30955a5",
+        "404b893bf03cca530200bbfa8c340aa829d522a2",
         []
        ]
       }
@@ -449117,7 +449143,7 @@
       []
      ],
      "urltestdata.json": [
-      "085ea1ec66944c679b63aa0ea2cb868316e46c88",
+      "19f9ecddbee1873d613a2bb4e3e7b7cde04fe78e",
       []
      ]
     },
@@ -480030,6 +480056,25 @@
       }
      ]
     ],
+    "compute_pressure_cross_origin_focus_control.tentative.https.window.js": [
+     "982e4bba0e6cb70d5eef7361a0110ab4b07be20e",
+     [
+      "compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.html",
+      {
+       "script_metadata": [
+        [
+         "timeout",
+         "long"
+        ],
+        [
+         "script",
+         "/common/get-host-info.sub.js"
+        ]
+       ],
+       "timeout": "long"
+      }
+     ]
+    ],
     "compute_pressure_detached_iframe.tentative.https.html": [
      "3b0a5504e536acf9426476122f59b7c8ed24b150",
      [
@@ -480130,7 +480175,7 @@
      ]
     ],
     "compute_pressure_privacy_test.tentative.https.window.js": [
-     "3a4198f547cc4b5f5fdf075f13efabc8429408a5",
+     "ceea886323cdfcb37f3deda425d90ef358a28c59",
      [
       "compute-pressure/compute_pressure_privacy_test.tentative.https.window.html",
       {
@@ -480168,6 +480213,13 @@
       }
      ]
     ],
+    "compute_pressure_same_origin_focus_control.tentative.https.window.js": [
+     "746f119f249c8c1a7d6451a5672823d011adf22e",
+     [
+      "compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.html",
+      {}
+     ]
+    ],
     "compute_pressure_supported_sources.tentative.https.window.js": [
      "2a69e731e7f9f7c5c0b54ea3b7bc9202bda57f16",
      [
@@ -515314,7 +515366,7 @@
       },
       "inline": {
        "append.tentative.html": [
-        "ee9a9e4ddbcf78a7517d8d038d66844880719e63",
+        "f80875622366939f48a7471513fb6319f75be718",
         [
          null,
          {}
@@ -522188,6 +522240,13 @@
        null,
        {}
       ]
+     ],
+     "update-media-feature.html": [
+      "8064117da73f956625f309263c9401b8adafc3a3",
+      [
+       null,
+       {}
+      ]
      ]
     },
     "motion": {
@@ -605213,7 +605272,7 @@
        ]
       ],
       "popover-attribute-basic.html": [
-       "e9167aaecbfa97b8b803e2b5bce9687919aa760c",
+       "c80534af9d1907d92aff6100447993b7a62366a4",
        [
         null,
         {
@@ -605270,7 +605329,7 @@
        ]
       ],
       "popover-invoking-attribute.html": [
-       "7b1dc20adf9beaa13ce2bb304659269cbb3d94ab",
+       "9b7a714f6dcdc025c53131ed014a74a7c4b4c945",
        [
         null,
         {
@@ -605287,7 +605346,7 @@
        ]
       ],
       "popover-light-dismiss.html": [
-       "2e9fdb43ec78eaf727ea3180e83b102f59927817",
+       "2f7e2de96b1b78cc219b9885a53db517ac5cfa8c",
        [
         null,
         {
@@ -605358,6 +605417,13 @@
         }
        ]
       ],
+      "popover-types-with-hints.tentative.html": [
+       "39d24a0ad437e723733a222b769890b6ec84d3bb",
+       [
+        null,
+        {}
+       ]
+      ],
       "popover-types.html": [
        "615c5a818c06c1bd75c5bfc80c2fc38e543048a9",
        [
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-001.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-001.html.ini
deleted file mode 100644
index 0842d0b5727..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-001.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[hit-test-floats-001.html]
-  [hit-test-floats-001]
-    expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-002.html.ini b/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-002.html.ini
index 51432362d66..ee34bc91078 100644
--- a/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-002.html.ini
+++ b/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-002.html.ini
@@ -1,3 +1,6 @@
 [block-in-inline-hittest-002.html]
   [elementsFromPoint]
     expected: FAIL
+
+  [elementFromPoint]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-float-002.html.ini b/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-float-002.html.ini
new file mode 100644
index 00000000000..3e5096beef3
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/normal-flow/block-in-inline-hittest-float-002.html.ini
@@ -0,0 +1,3 @@
+[block-in-inline-hittest-float-002.html]
+  [block-in-inline-hittest-float-002]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/selectors/first-letter-punctuation-087.xht.ini b/tests/wpt/metadata/css/CSS2/selectors/first-letter-punctuation-087.xht.ini
index 76a8e58afe1..b8dbd589878 100644
--- a/tests/wpt/metadata/css/CSS2/selectors/first-letter-punctuation-087.xht.ini
+++ b/tests/wpt/metadata/css/CSS2/selectors/first-letter-punctuation-087.xht.ini
@@ -1,3 +1,3 @@
 [first-letter-punctuation-087.xht]
   type: reftest
-  expected: TIMEOUT
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-flexbox/hittest-before-pseudo.html.ini b/tests/wpt/metadata/css/css-flexbox/hittest-before-pseudo.html.ini
new file mode 100644
index 00000000000..5b685485f3c
--- /dev/null
+++ b/tests/wpt/metadata/css/css-flexbox/hittest-before-pseudo.html.ini
@@ -0,0 +1,3 @@
+[hittest-before-pseudo.html]
+  [Hit-testing text within a pseudo-element flex-item should return the flexbox as the hittest result.]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering-2.html.ini b/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering-2.html.ini
new file mode 100644
index 00000000000..778000386d8
--- /dev/null
+++ b/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering-2.html.ini
@@ -0,0 +1,2 @@
+[image-set-zero-resolution-rendering-2.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering.html.ini b/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering.html.ini
new file mode 100644
index 00000000000..f2243377a7f
--- /dev/null
+++ b/tests/wpt/metadata/css/css-images/image-set/image-set-zero-resolution-rendering.html.ini
@@ -0,0 +1,2 @@
+[image-set-zero-resolution-rendering.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-transitions/properties-value-implicit-001.html.ini b/tests/wpt/metadata/css/css-transitions/properties-value-implicit-001.html.ini
index 6fbb05ea694..3b9c47983b6 100644
--- a/tests/wpt/metadata/css/css-transitions/properties-value-implicit-001.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/properties-value-implicit-001.html.ini
@@ -4,3 +4,84 @@
 
   [background-position length-em(em) / values]
     expected: FAIL
+
+  [border-top-width length-em(em) / values]
+    expected: FAIL
+
+  [border-right-width length-em(em) / values]
+    expected: FAIL
+
+  [border-bottom-width length-em(em) / values]
+    expected: FAIL
+
+  [border-left-width length-em(em) / values]
+    expected: FAIL
+
+  [padding-bottom length-em(em) / values]
+    expected: FAIL
+
+  [padding-left length-em(em) / values]
+    expected: FAIL
+
+  [padding-right length-em(em) / values]
+    expected: FAIL
+
+  [padding-top length-em(em) / values]
+    expected: FAIL
+
+  [margin-bottom length-em(em) / values]
+    expected: FAIL
+
+  [margin-left length-em(em) / values]
+    expected: FAIL
+
+  [margin-right length-em(em) / values]
+    expected: FAIL
+
+  [margin-top length-em(em) / values]
+    expected: FAIL
+
+  [height length-em(em) / values]
+    expected: FAIL
+
+  [width length-em(em) / values]
+    expected: FAIL
+
+  [min-height length-em(em) / values]
+    expected: FAIL
+
+  [min-width length-em(em) / values]
+    expected: FAIL
+
+  [max-height length-em(em) / values]
+    expected: FAIL
+
+  [max-width length-em(em) / values]
+    expected: FAIL
+
+  [right length-em(em) / values]
+    expected: FAIL
+
+  [left length-em(em) / values]
+    expected: FAIL
+
+  [line-height length-em(em) / values]
+    expected: FAIL
+
+  [letter-spacing length-em(em) / values]
+    expected: FAIL
+
+  [word-spacing length-em(em) / values]
+    expected: FAIL
+
+  [text-indent length-em(em) / values]
+    expected: FAIL
+
+  [outline-offset length-em(em) / values]
+    expected: FAIL
+
+  [outline-width length-em(em) / values]
+    expected: FAIL
+
+  [vertical-align length-em(em) / values]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/css-transitions/properties-value-inherit-002.html.ini b/tests/wpt/metadata/css/css-transitions/properties-value-inherit-002.html.ini
index cfd069eec6c..7d8c32a6a77 100644
--- a/tests/wpt/metadata/css/css-transitions/properties-value-inherit-002.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/properties-value-inherit-002.html.ini
@@ -326,3 +326,165 @@
 
   [margin-right length(mm) / values]
     expected: [FAIL, PASS]
+
+  [top length(px) / values]
+    expected: FAIL
+
+  [right length(px) / values]
+    expected: FAIL
+
+  [bottom length(px) / values]
+    expected: FAIL
+
+  [left length(px) / values]
+    expected: FAIL
+
+  [color color(rgba) / values]
+    expected: FAIL
+
+  [font-size length(pt) / values]
+    expected: FAIL
+
+  [font-size length(pc) / values]
+    expected: FAIL
+
+  [font-size length(px) / values]
+    expected: FAIL
+
+  [font-size length(em) / values]
+    expected: FAIL
+
+  [font-size length(ex) / values]
+    expected: FAIL
+
+  [font-size length(mm) / values]
+    expected: FAIL
+
+  [font-size length(cm) / values]
+    expected: FAIL
+
+  [font-size length(in) / values]
+    expected: FAIL
+
+  [font-size percentage(%) / values]
+    expected: FAIL
+
+  [font-weight font-weight(keyword) / values]
+    expected: FAIL
+
+  [font-weight font-weight(numeric) / values]
+    expected: FAIL
+
+  [line-height number(integer) / values]
+    expected: FAIL
+
+  [line-height number(decimal) / values]
+    expected: FAIL
+
+  [line-height length(pt) / values]
+    expected: FAIL
+
+  [line-height length(pc) / values]
+    expected: FAIL
+
+  [line-height length(px) / values]
+    expected: FAIL
+
+  [line-height length(em) / values]
+    expected: FAIL
+
+  [line-height length(ex) / values]
+    expected: FAIL
+
+  [line-height length(mm) / values]
+    expected: FAIL
+
+  [line-height length(cm) / values]
+    expected: FAIL
+
+  [line-height length(in) / values]
+    expected: FAIL
+
+  [line-height percentage(%) / values]
+    expected: FAIL
+
+  [letter-spacing length(pt) / values]
+    expected: FAIL
+
+  [letter-spacing length(pc) / values]
+    expected: FAIL
+
+  [letter-spacing length(px) / values]
+    expected: FAIL
+
+  [letter-spacing length(em) / values]
+    expected: FAIL
+
+  [letter-spacing length(ex) / values]
+    expected: FAIL
+
+  [letter-spacing length(mm) / values]
+    expected: FAIL
+
+  [letter-spacing length(cm) / values]
+    expected: FAIL
+
+  [letter-spacing length(in) / values]
+    expected: FAIL
+
+  [word-spacing length(pt) / values]
+    expected: FAIL
+
+  [word-spacing length(pc) / values]
+    expected: FAIL
+
+  [word-spacing length(px) / values]
+    expected: FAIL
+
+  [word-spacing length(em) / values]
+    expected: FAIL
+
+  [word-spacing length(ex) / values]
+    expected: FAIL
+
+  [word-spacing length(mm) / values]
+    expected: FAIL
+
+  [word-spacing length(cm) / values]
+    expected: FAIL
+
+  [word-spacing length(in) / values]
+    expected: FAIL
+
+  [word-spacing percentage(%) / values]
+    expected: FAIL
+
+  [text-indent length(pt) / values]
+    expected: FAIL
+
+  [text-indent length(pc) / values]
+    expected: FAIL
+
+  [text-indent length(px) / values]
+    expected: FAIL
+
+  [text-indent length(em) / values]
+    expected: FAIL
+
+  [text-indent length(ex) / values]
+    expected: FAIL
+
+  [text-indent length(mm) / values]
+    expected: FAIL
+
+  [text-indent length(cm) / values]
+    expected: FAIL
+
+  [text-indent length(in) / values]
+    expected: FAIL
+
+  [text-indent percentage(%) / values]
+    expected: FAIL
+
+  [text-shadow shadow(shadow) / values]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
new file mode 100644
index 00000000000..f18b8d2fcf9
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
@@ -0,0 +1,3 @@
+[CaretPosition-001.html]
+  [Element at (400, 100)]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini
new file mode 100644
index 00000000000..db065588308
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini
@@ -0,0 +1,3 @@
+[elementFromPoint-float-in-table.html]
+  [float-in-div]
+    expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-visibility-hidden-resizer.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-visibility-hidden-resizer.html.ini
deleted file mode 100644
index a6bca7ac372..00000000000
--- a/tests/wpt/metadata/css/cssom-view/elementFromPoint-visibility-hidden-resizer.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[elementFromPoint-visibility-hidden-resizer.html]
-  [elementFromPoint on resizer area of an element with visibility:hidden]
-    expected: FAIL
diff --git a/tests/wpt/metadata/css/mediaqueries/update-media-feature.html.ini b/tests/wpt/metadata/css/mediaqueries/update-media-feature.html.ini
new file mode 100644
index 00000000000..86fa7b45407
--- /dev/null
+++ b/tests/wpt/metadata/css/mediaqueries/update-media-feature.html.ini
@@ -0,0 +1,27 @@
+[update-media-feature.html]
+  [Should be known: '(update)']
+    expected: FAIL
+
+  [Should be known: '(update: none)']
+    expected: FAIL
+
+  [Should be known: '(update: slow)']
+    expected: FAIL
+
+  [Should be known: '(update: fast)']
+    expected: FAIL
+
+  [Should be parseable: '(update: ?)']
+    expected: FAIL
+
+  [Should be parseable: '(update: 10px)']
+    expected: FAIL
+
+  [Should be parseable: '(update: 0)']
+    expected: FAIL
+
+  [Check that update: fast always matches fast displays]
+    expected: FAIL
+
+  [Check that update always matches non printing documents]
+    expected: FAIL
diff --git a/tests/wpt/metadata/fetch/metadata/generated/css-images.sub.tentative.html.ini b/tests/wpt/metadata/fetch/metadata/generated/css-images.sub.tentative.html.ini
index 06d1fd50e64..9c862a6ba1c 100644
--- a/tests/wpt/metadata/fetch/metadata/generated/css-images.sub.tentative.html.ini
+++ b/tests/wpt/metadata/fetch/metadata/generated/css-images.sub.tentative.html.ini
@@ -147,5 +147,5 @@
   [list-style-image sec-fetch-site - HTTPS downgrade-upgrade]
     expected: FAIL
 
-  [background-image sec-fetch-user - Not sent to non-trustworthy same-origin destination]
-    expected: TIMEOUT
+  [border-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination]
+    expected: FAIL
diff --git a/tests/wpt/metadata/fetch/private-network-access/worker-blob-fetch.window.js.ini b/tests/wpt/metadata/fetch/private-network-access/worker-blob-fetch.window.js.ini
index a6676211048..eebbbd32f99 100644
--- a/tests/wpt/metadata/fetch/private-network-access/worker-blob-fetch.window.js.ini
+++ b/tests/wpt/metadata/fetch/private-network-access/worker-blob-fetch.window.js.ini
@@ -11,9 +11,6 @@
   [public to private: failure.]
     expected: FAIL
 
-  [public to public: success.]
-    expected: FAIL
-
   [treat-as-public to local: failure.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/history-traversal/persisted-user-state-restoration/scroll-restoration-fragment-scrolling-cross-origin.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/history-traversal/persisted-user-state-restoration/scroll-restoration-fragment-scrolling-cross-origin.html.ini
index c8a3c8f9e68..6e9f7acf151 100644
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/history-traversal/persisted-user-state-restoration/scroll-restoration-fragment-scrolling-cross-origin.html.ini
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/history-traversal/persisted-user-state-restoration/scroll-restoration-fragment-scrolling-cross-origin.html.ini
@@ -1,6 +1,6 @@
 [scroll-restoration-fragment-scrolling-cross-origin.html]
   type: testharness
-  expected: ERROR
+  expected: TIMEOUT
   [Manual scroll restoration should take precedent over scrolling to fragment in cross origin navigation]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
index 51fd557bd7f..149bcb4ff8c 100644
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
@@ -7,3 +7,6 @@
 
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank#foo']
     expected: FAIL
+
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
index 08972d12a65..2bb8df10123 100644
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
@@ -16,3 +16,6 @@
 
   [DE0D 0041 set in href="" targeting a frame and clicked]
     expected: FAIL
+
+  [D83D DE0D set in href="" targeting a frame and clicked]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
index 27889a98fb5..24d2f8ac554 100644
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
@@ -1,6 +1,3 @@
 [navigate-to-unparseable-url.html]
   [location.href setter throws a SyntaxError DOMException for unparseable URLs]
     expected: FAIL
-
-  [<a> tag navigate fails for unparseable URLs]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
new file mode 100644
index 00000000000..4ecd6d9f753
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
@@ -0,0 +1,3 @@
+[navigation-unload-cross-origin.sub.window.html]
+  [Cross-origin navigation started from unload handler must be ignored]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
deleted file mode 100644
index 60a4fa51f8a..00000000000
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[a-click.html]
-  [aElement.click() before the load event must NOT replace]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini
new file mode 100644
index 00000000000..d993e8dcc42
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini
@@ -0,0 +1,3 @@
+[pageload-image-in-popup.html]
+  [The document for a standalone media file should have one child in the body.]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse-during-unload.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse-during-unload.html.ini
deleted file mode 100644
index f5b7b25324f..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse-during-unload.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse-during-unload.html]
-  expected: TIMEOUT
-  [Traversing the history during unload]
-    expected: TIMEOUT
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 ba0aed26689..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,3 +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_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index 7a5fcb79165..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/update-the-rendering.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/update-the-rendering.html.ini
index 9b27c5c1957..add66c12f92 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/update-the-rendering.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/update-the-rendering.html.ini
@@ -1,7 +1,6 @@
 [update-the-rendering.html]
-  expected: TIMEOUT
   ["Flush autofocus candidates" should be happen after the first animation frame callbacks, and before a resize event in the next iteration of window event loop.]
     expected: TIMEOUT
 
   ["Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks]
-    expected: TIMEOUT
+    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 e5994e21efc..25d9964f057 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
@@ -1,5 +1,4 @@
 [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: 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 841bafc6eca..7df8f9458e9 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
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_escaping-2.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/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 fe55ddae3f1..eacbe5794ea 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
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
+  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_nonescaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index f9138fb999a..6f7461b9472 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 76e34322dca..6bec7a732b8 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index d5fd800f09d..653c5e98f2f 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,4 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
index 47b45e65a1c..3cdeb8ebcbc 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
@@ -1,9 +1,3 @@
 [non-active-document.html]
   [DOMParser]
     expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/forms/historical.html.ini b/tests/wpt/metadata/html/semantics/forms/historical.html.ini
deleted file mode 100644
index 5d8289307cc..00000000000
--- a/tests/wpt/metadata/html/semantics/forms/historical.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[historical.html]
-  [<input name=isindex> should not be supported]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/popovers/popover-types-with-hints.tentative.html.ini b/tests/wpt/metadata/html/semantics/popovers/popover-types-with-hints.tentative.html.ini
new file mode 100644
index 00000000000..1b22b6c66b1
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/popovers/popover-types-with-hints.tentative.html.ini
@@ -0,0 +1,21 @@
+[popover-types-with-hints.tentative.html]
+  [manuals do not close popovers]
+    expected: FAIL
+
+  [autos close hints but not manuals]
+    expected: FAIL
+
+  [hint is not closed by pre-existing auto]
+    expected: FAIL
+
+  [If a popover=hint is shown, it should hide any other open popover=hint pop-ups, including ancestral pop-ups. (You can't nest popover=hint)]
+    expected: FAIL
+
+  [If a popover=auto is shown, it should hide any open popover=hint, including if the popover=hint is an ancestral pop-up of the popover=auto. (You can't nest a popover=auto inside a popover=hint)]
+    expected: FAIL
+
+  [If you: a) show a popover=auto (call it D), then b) show a descendent popover=hint of D (call it T), then c) hide D, then T should be hidden. (A popover=hint can be nested inside a popover=auto)]
+    expected: FAIL
+
+  [If you: a) show a popover=auto (call it D), then b) show a non-descendent popover=hint of D (call it T), then c) hide D, then T should be left showing. (Non-nested popover=hint can stay open when unrelated popover=autos are hidden)]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
deleted file mode 100644
index 2212b9d731f..00000000000
--- a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[async-script.html?reload]
-  expected: ERROR
-
-[async-script.html]
diff --git a/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
new file mode 100644
index 00000000000..b8bdf33cb65
--- /dev/null
+++ b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
@@ -0,0 +1,3 @@
+[DOMContentLoaded-defer.html]
+  [The end: DOMContentLoaded and defer scripts]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
deleted file mode 100644
index fc0233f5241..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[module-delayed.html]
-  [async document.write in a module]
-    expected: FAIL
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-tla-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-tla-delayed.html.ini
deleted file mode 100644
index f9a4f08cd70..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-tla-delayed.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[module-tla-delayed.html]
-  [document.write in an imported module]
-    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 7d4c3a1b06d..e55f8f2ce3c 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
@@ -5,4 +5,4 @@
     expected: TIMEOUT
 
   [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: TIMEOUT
+    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 8bcf3a07de4..31bfd644df0 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
@@ -16,4 +15,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
index 4a48dd15a9d..1d71471b73c 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
@@ -1,6 +1,7 @@
 [promise-rejection-events.html]
+  expected: TIMEOUT
   [delayed handling: delaying handling rejected promise created from createImageBitmap will cause both events to fire]
-    expected: FAIL
+    expected: TIMEOUT
 
   [unhandledrejection: from createImageBitmap which is UA triggered]
     expected: FAIL
diff --git a/tests/wpt/metadata/webmessaging/with-ports/017.html.ini b/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
new file mode 100644
index 00000000000..c7946fc91b4
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
@@ -0,0 +1,4 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
deleted file mode 100644
index b7b36c1d3a4..00000000000
--- a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
diff --git a/tests/wpt/metadata/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini b/tests/wpt/metadata/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini
new file mode 100644
index 00000000000..aa6c9e5b826
--- /dev/null
+++ b/tests/wpt/metadata/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini
@@ -0,0 +1,4 @@
+[localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html]
+  expected: TIMEOUT
+  [StorageKey: test 3P about:blank window opened from a 3P iframe]
+    expected: TIMEOUT
diff --git a/tests/wpt/mozilla/meta/mozilla/scrollBy.html.ini b/tests/wpt/mozilla/meta/mozilla/scrollBy.html.ini
new file mode 100644
index 00000000000..f78f699f620
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/scrollBy.html.ini
@@ -0,0 +1,3 @@
+[scrollBy.html]
+  [Ensure that the window.scrollBy function affects scroll position as expected]
+    expected: FAIL
diff --git a/tests/wpt/mozilla/meta/mozilla/task_queue_throttling.any.js.ini b/tests/wpt/mozilla/meta/mozilla/task_queue_throttling.any.js.ini
new file mode 100644
index 00000000000..6ef3d276974
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/task_queue_throttling.any.js.ini
@@ -0,0 +1,6 @@
+[task_queue_throttling.any.html]
+  [Throttling the performance timeline task queue.]
+    expected: FAIL
+
+
+[task_queue_throttling.any.worker.html]
diff --git a/tests/wpt/web-platform-tests/IndexedDB/resources/support.js b/tests/wpt/web-platform-tests/IndexedDB/resources/support.js
index 18ed971ad7c..5036e504665 100644
--- a/tests/wpt/web-platform-tests/IndexedDB/resources/support.js
+++ b/tests/wpt/web-platform-tests/IndexedDB/resources/support.js
@@ -216,7 +216,10 @@ async function createIndexedDBForTesting(rc, dbName, version) {
   await rc.executeScript((dbName, version) => {
     let request = indexedDB.open(dbName, version);
     request.onupgradeneeded = () => {
-      request.result.createObjectStore('store');
+      if (version == 1) {
+        // Only create the object store once.
+        request.result.createObjectStore('store');
+      }
     }
     request.onversionchange = () => {
       fail(t, 'unexpectedly received versionchange event.');
diff --git a/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js
new file mode 100644
index 00000000000..982e4bba0e6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_cross_origin_focus_control.tentative.https.window.js
@@ -0,0 +1,50 @@
+// META: timeout=long
+// META: script=/common/get-host-info.sub.js
+
+'use strict';
+
+promise_test(t => {
+  const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
+  document.body.appendChild(iframe);
+  iframe.contentWindow.focus();
+
+  const observer = new PressureObserver(() => {
+    assert_unreached('The observer callback should not be called');
+  });
+  t.add_cleanup(() => {
+    observer.disconnect();
+    iframe.remove();
+  });
+
+  return new Promise(resolve => t.step_timeout(resolve, 2000));
+}, 'Observer in main frame should not receive PressureRecord when focused on cross-origin iframe');
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
+  iframe.allow = 'compute-pressure';
+  const iframeLoadWatcher = new EventWatcher(t, iframe, 'load');
+  document.body.appendChild(iframe);
+  await iframeLoadWatcher.wait_for('load');
+  // Focus on the main frame to make the iframe lose focus, so that
+  // PressureObserver in the iframe can't receive PressureRecord by default.
+  // If the main frame has focus, but the iframe is cross-origin with the main
+  // frame, PressureObserver in the iframe still can't receive PressureRecord.
+  window.focus();
+
+  return new Promise((resolve, reject) => {
+    window.addEventListener('message', (e) => {
+      if (e.data.result === 'timeout') {
+        resolve();
+      } else if (e.data.result === 'success') {
+        reject('Observer should not receive PressureRecord');
+      } else {
+        reject('Got unexpected reply');
+      }
+    }, {once: true});
+    iframe.contentWindow.postMessage({command: 'start'}, '*');
+  });
+}, 'Observer in iframe should not receive PressureRecord when focused on cross-origin main frame');
diff --git a/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
index 3a4198f547c..ceea886323c 100644
--- a/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
+++ b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_privacy_test.tentative.https.window.js
@@ -16,12 +16,13 @@ promise_test(async t => {
   assert_not_equals(pipWindow.height, 0);
 
   const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
   document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default. However, if the main frame is the initiator of active
-  // Picture-in-Picture session, PressureObserver in the main frame can
-  // receive PressureRecord.
+  // Focus on the cross-origin iframe, so that PressureObserver in the main
+  // frame can't receive PressureRecord by default. However, if the main
+  // frame is the initiator of active Picture-in-Picture session,
+  // PressureObserver in the main frame can receive PressureRecord.
   iframe.contentWindow.focus();
 
   await new Promise(resolve => {
@@ -45,11 +46,13 @@ promise_test(async t => {
   assert_true(stream.active);
 
   const iframe = document.createElement('iframe');
+  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
+      '/compute-pressure/resources/support-iframe.html';
   document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default. However, if the main frame's browsing context is capturing,
-  // PressureObserver in the main frame can receive PressureRecord.
+  // Focus on the cross-origin iframe, so that PressureObserver in the main
+  // frame can't receive PressureRecord by default. However, if the main
+  // frame's browsing context is capturing, PressureObserver in the main
+  // frame can receive PressureRecord.
   iframe.contentWindow.focus();
 
   await new Promise(resolve => {
@@ -62,69 +65,3 @@ promise_test(async t => {
     observer.observe('cpu');
   });
 }, 'Observer should receive PressureRecord if browsing context is capturing');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  document.body.appendChild(iframe);
-  // Focus on the iframe to make the main frame lose focus, so that
-  // PressureObserver in the main frame can't receive PressureRecord
-  // by default.
-  iframe.contentWindow.focus();
-
-  const observer = new PressureObserver(() => {
-    assert_unreached('The observer callback should not be called');
-  });
-  t.add_cleanup(() => {
-    observer.disconnect();
-    iframe.remove();
-  });
-
-  return new Promise(resolve => t.step_timeout(resolve, 2000));
-}, 'Observer should not receive PressureRecord when top-level browsing context does not have system focus');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  document.body.appendChild(iframe);
-  // Focus on the main frame to make the iframe lose focus, so that
-  // PressureObserver in the iframe can't receive PressureRecord by default.
-  // However, if the iframe is same-origin with the main frame and the main
-  // frame has focus, PressureObserver in iframe can receive PressureRecord.
-  window.focus();
-
-  await new Promise(resolve => {
-    const observer = new iframe.contentWindow.PressureObserver(resolve);
-    t.add_cleanup(() => {
-      observer.disconnect();
-      iframe.remove();
-    });
-    observer.observe('cpu');
-  });
-}, 'Observer in iframe should receive PressureRecord when focused on same-origin main frame');
-
-promise_test(async t => {
-  const iframe = document.createElement('iframe');
-  iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN +
-      '/compute-pressure/resources/support-iframe.html';
-  iframe.allow = 'compute-pressure';
-  const iframeLoadWatcher = new EventWatcher(t, iframe, 'load');
-  document.body.appendChild(iframe);
-  await iframeLoadWatcher.wait_for('load');
-  // Focus on the main frame to make the iframe lose focus, so that
-  // PressureObserver in the iframe can't receive PressureRecord by default.
-  // If the main frame has focus, but the iframe is cross-origin with the main
-  // frame, PressureObserver in the iframe still can't receive PressureRecord.
-  window.focus();
-
-  return new Promise((resolve, reject) => {
-    window.addEventListener('message', (e) => {
-      if (e.data.result === 'timeout') {
-        resolve();
-      } else if (e.data.result === 'success') {
-        reject('Observer should not receive PressureRecord');
-      } else {
-        reject('Got unexpected reply');
-      }
-    }, {once: true});
-    iframe.contentWindow.postMessage({command: 'start'}, '*');
-  });
-}, 'Observer in iframe should not receive PressureRecord when focused on cross-origin main frame');
diff --git a/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js
new file mode 100644
index 00000000000..746f119f249
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compute-pressure/compute_pressure_same_origin_focus_control.tentative.https.window.js
@@ -0,0 +1,35 @@
+'use strict';
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  iframe.contentWindow.focus();
+
+  await new Promise(resolve => {
+    const observer = new PressureObserver(resolve);
+    t.add_cleanup(async () => {
+      observer.disconnect();
+      iframe.remove();
+    });
+    observer.observe('cpu');
+  });
+}, 'Observer in main frame should receive PressureRecord when focused on same-origin iframe');
+
+promise_test(async t => {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  // Focus on the main frame to make the iframe lose focus, so that
+  // PressureObserver in the iframe can't receive PressureRecord by default.
+  // However, if the iframe is same-origin with the main frame and the main
+  // frame has focus, PressureObserver in iframe can receive PressureRecord.
+  window.focus();
+
+  await new Promise(resolve => {
+    const observer = new iframe.contentWindow.PressureObserver(resolve);
+    t.add_cleanup(() => {
+      observer.disconnect();
+      iframe.remove();
+    });
+    observer.observe('cpu');
+  });
+}, 'Observer in iframe should receive PressureRecord when focused on same-origin main frame');
diff --git a/tests/wpt/web-platform-tests/css/css-break/out-of-flow-in-multicolumn-116.html b/tests/wpt/web-platform-tests/css/css-break/out-of-flow-in-multicolumn-116.html
new file mode 100644
index 00000000000..fac536a65b3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-break/out-of-flow-in-multicolumn-116.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1412313">
+<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="columns:1; column-fill:auto; height:100px; width:100px;">
+  <div style="contain:size; height:100px; background:green;">
+    <div style="height:50px;"></div>
+    <span style="position:relative; height:50px;">
+      <div style="height:25px; background:red;"></div>
+      <div style="position:absolute; top:0; width:100px; height:25px; background:green;"></div>
+    </span>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-break/table/repeated-section/background-001.tentative.html b/tests/wpt/web-platform-tests/css/css-break/table/repeated-section/background-001.tentative.html
new file mode 100644
index 00000000000..2084f4ad313
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-break/table/repeated-section/background-001.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1418818">
+<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="columns:2; column-fill:auto; gap:0; width:100px; height:400px;">
+  <div style="display:table; width:100%;">
+    <div style="display:table-header-group; break-inside:avoid;">
+      <div style="height:100px; background:linear-gradient(green 100px, red 100px);"></div>
+    </div>
+    <div style="height:400px;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering-2.html b/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering-2.html
similarity index 72%
rename from tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering-2.html
rename to tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering-2.html
index c8b560b7fcb..5c835a3fbcc 100644
--- a/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering-2.html
+++ b/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering-2.html
@@ -4,13 +4,13 @@
 <link rel="author" title="Traian Captan" href="mailto:tcaptan@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-images-4/#image-set-notation">
 <link rel="match" href="reference/image-set-rendering-ref.html">
-<meta name="assert" content="image-set rendering when resolution is invalid">
+<meta name="assert" content="image-set rendering with zero resolution">
 <style>
   #test {
-    background-image: url("/images/green.png");
+    background-image: url("/images/red.png");
     background-image: image-set(
-      url("/images/red.png") 0x,
-      url("/images/red.png") 2x
+      url("/images/green.png") 0x,
+      url("/images/green.png") 2x
     );
     width: 100px;
     height: 100px;
diff --git a/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering.html b/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering.html
similarity index 71%
rename from tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering.html
rename to tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering.html
index 91aeaccebdc..d7e4eb7fdc2 100644
--- a/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-invalid-resolution-rendering.html
+++ b/tests/wpt/web-platform-tests/css/css-images/image-set/image-set-zero-resolution-rendering.html
@@ -4,11 +4,11 @@
 <link rel="author" title="Traian Captan" href="mailto:tcaptan@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-images-4/#image-set-notation">
 <link rel="match" href="reference/image-set-rendering-ref.html">
-<meta name="assert" content="image-set rendering when resolution is invalid">
+<meta name="assert" content="image-set rendering with zero resolution">
 <style>
   #test {
-    background-image: url("/images/green.png");
-    background-image: image-set(url("/images/red.png") 0x);
+    background-image: url("/images/red.png");
+    background-image: image-set(url("/images/green.png") 0x);
     width: 100px;
     height: 100px;
   }
diff --git a/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic-ref.html b/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic-ref.html
index 8825ad47d27..8038f369cde 100644
--- a/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic-ref.html
@@ -5,8 +5,8 @@
 <style>
   .test {
     background-color: green;
-    width: 100px;
-    height: 100px;
+    width: 30px;
+    height: 30px;
     display: grid;
   }
 
diff --git a/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic.html b/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic.html
index dde3ebbcfdb..19ff48e4a29 100644
--- a/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic.html
+++ b/tests/wpt/web-platform-tests/css/css-nesting/nesting-basic.html
@@ -6,8 +6,8 @@
 <style>
   .test {
     background-color: red;
-    width: 100px;
-    height: 100px;
+    width: 30px;
+    height: 30px;
     display: grid;
   }
 
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/inline/append.tentative.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/inline/append.tentative.html
index ee9a9e4ddbc..f8087562236 100644
--- a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/inline/append.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/inline/append.tentative.html
@@ -56,4 +56,10 @@ test(t => {
   assert_style_value_array_equals(result, [CSS.s(5), CSS.s(10), CSS.s(1), CSS.s(2)]);
 }, 'StylePropertyMap.append is case-insensitive');
 
+// https://crbug.com/1417176
+test(t => {
+  let styleMap = createInlineStyleMap(t, 'transition-duration: inherit');
+  assert_throws_js(TypeError, () => styleMap.append('transition-duration', '1s'));
+}, 'StylePropertyMap.append rejects appending to CSS-wide keywords');
+
 </script>
diff --git a/tests/wpt/web-platform-tests/css/mediaqueries/update-media-feature.html b/tests/wpt/web-platform-tests/css/mediaqueries/update-media-feature.html
new file mode 100644
index 00000000000..8064117da73
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/mediaqueries/update-media-feature.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<title>CSS Media Query Test: update media feature</title>
+<link rel="help" href="https://drafts.csswg.org/mediaqueries-4/#descdef-media-update">
+<meta assert="The test is supposed to be run on fast computer displays as it will no match otherwise. The definition of fast can be found in the spec link.">
+<script type="text/javascript" src="/resources/testharness.js"></script>
+<script type="text/javascript" src="/resources/testharnessreport.js"></script>
+<script type="text/javascript" src="resources/matchmedia-utils.js"></script>
+
+<script>
+query_should_be_known("(update)");
+query_should_be_known("(update: none)");
+query_should_be_known("(update: slow)");
+query_should_be_known("(update: fast)");
+
+query_should_be_unknown("(update: ?)");
+query_should_be_unknown("(update: 10px)");
+query_should_be_unknown("(update: 0)");
+
+test(() => {
+  let match_standard = window.matchMedia("(update: fast)");
+  assert_true(match_standard.matches);
+}, "Check that update: fast always matches fast displays");
+
+test(() => {
+  let match_standard = window.matchMedia("(update: slow)");
+  assert_false(match_standard.matches);
+}, "Check that update: slow doesn't match fast displays");
+
+test(() => {
+  let match_standard = window.matchMedia("(update: none)");
+  assert_false(match_standard.matches);
+}, "Check that update: none doesn't match fast displays");
+
+test(() => {
+  let match_standard = window.matchMedia("(update)");
+  assert_true(match_standard.matches);
+}, "Check that update always matches non printing documents");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-attribute-basic.html b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-attribute-basic.html
index e9167aaecbf..c80534af9d1 100644
--- a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-attribute-basic.html
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-attribute-basic.html
@@ -15,6 +15,7 @@
   <div popover id=boolean>Pop up</div>
   <div popover="">Pop up</div>
   <div popover=auto>Pop up</div>
+  <div popover=hint>Pop up</div>
   <div popover=manual>Pop up</div>
   <article popover>Different element type</article>
   <header popover>Different element type</header>
@@ -163,6 +164,10 @@ window.onload = () => {
     assert_equals(popover.popover,'manual','Invalid values should reflect as "manual"');
     popover.removeAttribute('popover');
     assert_equals(popover.popover,null,'No value should reflect as null');
+    if (popoverHintSupported()) {
+      popover.popover='hint';
+      assert_equals(popover.getAttribute('popover'),'hint');
+    }
     popover.popover='auto';
     assert_equals(popover.getAttribute('popover'),'auto');
     popover.popover='';
@@ -223,7 +228,13 @@ window.onload = () => {
     const popover = createPopover(t);
     popover.showPopover();
     assert_true(popover.matches(':open'));
-    popover.setAttribute('popover','manual'); // Change popover type
+    if (popoverHintSupported()) {
+      popover.setAttribute('popover','hint'); // Change popover type
+      assert_false(popover.matches(':open'));
+      popover.showPopover();
+      assert_true(popover.matches(':open'));
+      popover.setAttribute('popover','manual');
+    }
     assert_false(popover.matches(':open'));
     popover.showPopover();
     assert_true(popover.matches(':open'));
@@ -237,7 +248,7 @@ window.onload = () => {
     assert_false(popover.matches(':open'),'From "auto" to "invalid" (which is interpreted as "manual") should close the popover');
   },'Changing attribute values should close open popovers');
 
-  const validTypes = ["auto","manual"];
+  const validTypes = popoverHintSupported() ? ["auto","hint","manual"] : ["auto","manual"];
   validTypes.forEach(type => {
     test((t) => {
       const popover = createPopover(t);
@@ -376,6 +387,7 @@ window.onload = () => {
                     popover.hidePopover();
                     break;
                   case 'auto':
+                  case 'hint':
                     assert_false(popover.matches(':open'),'A popover=auto should light-dismiss');
                     break;
                 }
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-backdrop-appearance.html b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-backdrop-appearance.html
index c71e148644b..cf57aee69e3 100644
--- a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-backdrop-appearance.html
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-backdrop-appearance.html
@@ -36,7 +36,7 @@
 <p>Test for [popover]::backdrop presence and stacking order. The test passes
   if there are 3 stacked boxes, with the brightest green on top.</p>
 <div popover id=bottom>Bottom
-  <div popover id=middle>Middle
+  <div popover=hint id=middle>Middle
     <div popover=manual id=top>Top</div>
   </div>
 </div>
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-invoking-attribute.html b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-invoking-attribute.html
index 7b1dc20adf9..9b7a714f6dc 100644
--- a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-invoking-attribute.html
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-invoking-attribute.html
@@ -10,6 +10,7 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-actions.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/popover-utils.js"></script>
 
 <body>
 <script>
@@ -60,8 +61,9 @@ const invokers = [
   ...supportedInputButtonTypes,
   ...unsupportedTypes,
 ];
+const validTypes = popoverHintSupported() ? ["auto","hint","manual"] : ["auto","manual"];
 window.addEventListener('load', () => {
-  ["auto","manual"].forEach(type => {
+  validTypes.forEach(type => {
     invokers.forEach(testcase => {
       ["toggle","hide","show","ShOw","garbage",null,undefined].forEach(action => {
         [false,true].forEach(use_idl_for_target => {
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-light-dismiss.html b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-light-dismiss.html
index 2e9fdb43ec7..2f7e2de96b1 100644
--- a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-light-dismiss.html
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-light-dismiss.html
@@ -461,6 +461,52 @@ promise_test(async () => {
 },'Ensure circular/convoluted ancestral relationships are functional, with a direct showPopover()');
 </script>
 
+<div popover id=p10>Popover</div>
+<div popover=hint id=p11>Hint</div>
+<div popover=manual id=p12>Manual</div>
+<style>
+  #p10 {top:100px;}
+  #p11 {top:200px;}
+  #p12 {top:300px;}
+</style>
+<script>
+if (popoverHintSupported()) {
+  promise_test(async () => {
+    const auto = document.querySelector('#p10');
+    const hint = document.querySelector('#p11');
+    const manual = document.querySelector('#p12');
+    // All three can be open at once, if shown in this order:
+    auto.showPopover();
+    hint.showPopover();
+    manual.showPopover();
+    assert_true(auto.matches(':open'));
+    assert_true(hint.matches(':open'));
+    assert_true(manual.matches(':open'));
+    // Clicking the hint will close the auto, but not the manual.
+    await clickOn(hint);
+    assert_false(auto.matches(':open'),'auto should be hidden');
+    assert_true(hint.matches(':open'),'hint should stay open');
+    assert_true(manual.matches(':open'),'manual does not light dismiss');
+    // Clicking outside should close the hint, but not the manual:
+    await clickOn(outside);
+    assert_false(auto.matches(':open'));
+    assert_false(hint.matches(':open'),'hint should close');
+    assert_true(manual.matches(':open'),'manual does not light dismiss');
+    manual.hidePopover();
+    assert_false(manual.matches(':open'));
+    auto.showPopover();
+    hint.showPopover();
+    assert_true(auto.matches(':open'));
+    assert_true(hint.matches(':open'));
+    // Clicking on the auto should close the hint:
+    await clickOn(auto);
+    assert_true(auto.matches(':open'),'auto should stay open');
+    assert_false(hint.matches(':open'),'hint should light dismiss');
+    auto.hidePopover();
+    assert_false(auto.matches(':open'));
+  },'Light dismiss of mixed popover types including hints');
+}
+</script>
 <div popover id=p13>Popover 1
   <div popover id=p14>Popover 2
     <div popover id=p15>Popover 3</div>
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/popover-types-with-hints.tentative.html b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-types-with-hints.tentative.html
new file mode 100644
index 00000000000..39d24a0ad43
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/popover-types-with-hints.tentative.html
@@ -0,0 +1,184 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://open-ui.org/components/popup.research.explainer">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div>
+  <div popover>Popover</div>
+  <div popover=hint>Hint</div>
+  <div popover=manual>Async</div>
+  <div popover=manual>Async</div>
+  <script>
+  {
+    const auto = document.currentScript.parentElement.querySelector('[popover=""]');
+    const hint = document.currentScript.parentElement.querySelector('[popover=hint]');
+    const manual = document.currentScript.parentElement.querySelectorAll('[popover=manual]')[0];
+    const manual2 = document.currentScript.parentElement.querySelectorAll('[popover=manual]')[1];
+    function assert_state_1(autoOpen,hintOpen,manualOpen,manual2Open) {
+      assert_equals(auto.matches(':open'),autoOpen,'auto open state is incorrect');
+      assert_equals(hint.matches(':open'),hintOpen,'hint open state is incorrect');
+      assert_equals(manual.matches(':open'),manualOpen,'manual open state is incorrect');
+      assert_equals(manual2.matches(':open'),manual2Open,'manual2 open state is incorrect');
+    }
+    test(() => {
+      assert_state_1(false,false,false,false);
+      auto.showPopover();
+      assert_state_1(true,false,false,false);
+      hint.showPopover();
+      assert_state_1(true,true,false,false);
+      manual.showPopover();
+      assert_state_1(true,true,true,false);
+      manual2.showPopover();
+      assert_state_1(true,true,true,true);
+      hint.hidePopover();
+      assert_state_1(true,false,true,true);
+      auto.hidePopover();
+      assert_state_1(false,false,true,true);
+      auto.showPopover();
+      hint.showPopover();
+      assert_state_1(true,true,true,true);
+      auto.hidePopover(); // Non-nested tooltips can stay open when unrelated popovers are hidden.
+      assert_state_1(false,true,true,true);
+      hint.hidePopover();
+      manual.hidePopover();
+      assert_state_1(false,false,false,true);
+      manual2.hidePopover();
+      assert_state_1(false,false,false,false);
+    },'manuals do not close popovers');
+
+    test(() => {
+      assert_state_1(false,false,false,false);
+      hint.showPopover();
+      manual.showPopover();
+      manual2.showPopover();
+      assert_state_1(false,true,true,true);
+      auto.showPopover();
+      assert_state_1(true,false,true,true);
+      auto.hidePopover();
+      assert_state_1(false,false,true,true);
+      manual.hidePopover();
+      manual2.hidePopover();
+      assert_state_1(false,false,false,false);
+    },'autos close hints but not manuals');
+  }
+  </script>
+</div>
+
+<div>
+  <div popover>popover 1
+    <div popover>popover 2
+      <p id=anchorid>Anchor</p>
+      <div popover>popover 3</div>
+    </div>
+  </div>
+  <div popover=hint anchor=anchorid>Hint anchored to pop-up</div>
+  <script>
+  {
+    const popover1 = document.currentScript.parentElement.querySelectorAll('[popover=""]')[0];
+    const popover2 = document.currentScript.parentElement.querySelectorAll('[popover=""]')[1];
+    const popover3 = document.currentScript.parentElement.querySelectorAll('[popover=""]')[2];
+    const hint = document.currentScript.parentElement.querySelector('[popover=hint]');
+    function assert_state_2(popover1Open,popover2Open,popover3Open,hintOpen) {
+      assert_equals(popover1.matches(':open'),popover1Open,'popover1 open state is incorrect');
+      assert_equals(popover2.matches(':open'),popover2Open,'popover2 open state is incorrect');
+      assert_equals(popover3.matches(':open'),popover3Open,'popover3 open state is incorrect');
+      assert_equals(hint.matches(':open'),hintOpen,'hint open state is incorrect');
+    }
+    test(() => {
+      assert_state_2(false,false,false,false);
+      popover1.showPopover();
+      popover2.showPopover();
+      popover3.showPopover();
+      assert_state_2(true,true,true,false);
+      hint.showPopover(); // Because hint is nested in popover2, popover3 should be hidden
+      assert_state_2(true,true,false,true);
+      popover1.hidePopover(); // Should close the hint, which is anchored to popover2
+      assert_state_2(false,false,false,false);
+    },'hint is not closed by pre-existing auto');
+  }
+  </script>
+</div>
+
+<div>
+  <div popover=hint>Hint
+    <div popover=hint>Nested hint</div>
+  </div>
+  <script>
+  test(() => {
+    const hint1 = document.currentScript.parentElement.querySelectorAll('[popover=hint]')[0];
+    const hint2 = document.currentScript.parentElement.querySelectorAll('[popover=hint]')[1];
+    hint1.showPopover();
+    assert_true(hint1.matches(':open'));
+    assert_false(hint2.matches(':open'));
+    hint2.showPopover();
+    assert_false(hint1.matches(':open'));
+    assert_true(hint2.matches(':open'));
+    hint2.hidePopover();
+  },'If a popover=hint is shown, it should hide any other open popover=hint pop-ups, including ancestral pop-ups. (You can\'t nest popover=hint)');
+  </script>
+</div>
+
+<div>
+  <div popover="hint">Hint
+    <div popover>Nested auto (note - never visible, since inside display:none subtree)</div>
+  </div>
+  <script>
+  test(() => {
+    const hint = document.currentScript.parentElement.querySelector('[popover=hint]');
+    const auto = document.currentScript.parentElement.querySelector('[popover=""]');
+    hint.showPopover();
+    assert_true(hint.matches(':open'));
+    assert_false(auto.matches(':open'));
+    auto.showPopover();
+    assert_false(hint.matches(':open'));
+    assert_true(auto.matches(':open'));
+    auto.hidePopover();
+  },'If a popover=auto is shown, it should hide any open popover=hint, including if the popover=hint is an ancestral pop-up of the popover=auto. (You can\'t nest a popover=auto inside a popover=hint)');
+  </script>
+</div>
+
+<div>
+  <div popover>Auto
+    <div popover>Nested Auto</div>
+    <div popover=hint>Nested hint</div>
+  </div>
+  <script>
+  test(() => {
+    const auto = document.currentScript.parentElement.querySelectorAll('[popover=""]')[0];
+    const auto2 = document.currentScript.parentElement.querySelectorAll('[popover=""]')[1];
+    const hint = document.currentScript.parentElement.querySelector('[popover=hint]');
+    auto.showPopover();
+    auto2.showPopover();
+    assert_true(auto.matches(':open'));
+    assert_true(auto2.matches(':open'));
+    hint.showPopover(); // This should hide auto2, since it is nested in auto1.
+    assert_true(auto.matches(':open'));
+    assert_false(auto2.matches(':open'));
+    assert_true(hint.matches(':open'));
+    auto.hidePopover(); // Should hide both auto and hint.
+    assert_false(auto.matches(':open'));
+    assert_false(hint.matches(':open'));
+  },'If you: a) show a popover=auto (call it D), then b) show a descendent popover=hint of D (call it T), then c) hide D, then T should be hidden. (A popover=hint can be nested inside a popover=auto)');
+  </script>
+</div>
+
+<div>
+  <div popover>Auto</div>
+  <div popover=hint>Non-Nested hint</div>
+  <script>
+  test(() => {
+    const auto = document.currentScript.parentElement.querySelector('[popover=""]');
+    const hint = document.currentScript.parentElement.querySelector('[popover=hint]');
+    auto.showPopover();
+    hint.showPopover();
+    assert_true(auto.matches(':open'));
+    assert_true(hint.matches(':open'));
+    auto.hidePopover();
+    assert_false(auto.matches(':open'));
+    assert_true(hint.matches(':open'));
+    hint.hidePopover();
+  },'If you: a) show a popover=auto (call it D), then b) show a non-descendent popover=hint of D (call it T), then c) hide D, then T should be left showing. (Non-nested popover=hint can stay open when unrelated popover=autos are hidden)');
+  </script>
+</div>
diff --git a/tests/wpt/web-platform-tests/html/semantics/popovers/resources/popover-utils.js b/tests/wpt/web-platform-tests/html/semantics/popovers/resources/popover-utils.js
index 0df24ccd4fc..404b893bf03 100644
--- a/tests/wpt/web-platform-tests/html/semantics/popovers/resources/popover-utils.js
+++ b/tests/wpt/web-platform-tests/html/semantics/popovers/resources/popover-utils.js
@@ -107,3 +107,10 @@ function showDefaultopenPopoversOnLoad() {
     window.addEventListener('load',show,{once:true});
   }
 }
+function popoverHintSupported() {
+  // TODO(crbug.com/1416284): This function should be removed, and
+  // any calls replaced with `true`, once popover=hint ships.
+  const testElement = document.createElement('div');
+  testElement.popover = 'hint';
+  return testElement.popover === 'hint';
+}
diff --git a/tests/wpt/web-platform-tests/url/resources/urltestdata.json b/tests/wpt/web-platform-tests/url/resources/urltestdata.json
index 085ea1ec669..19f9ecddbee 100644
--- a/tests/wpt/web-platform-tests/url/resources/urltestdata.json
+++ b/tests/wpt/web-platform-tests/url/resources/urltestdata.json
@@ -8877,5 +8877,20 @@
     "input": "",
     "base": "about:blank",
     "failure": true
+  },
+  {
+    "input": "https://example.com/\"quoted\"",
+    "base": "about:blank",
+    "hash": "",
+    "host": "example.com",
+    "hostname": "example.com",
+    "href": "https://example.com/%22quoted%22",
+    "origin": "https://example.com",
+    "password": "",
+    "pathname": "/%22quoted%22",
+    "port": "",
+    "protocol": "https:",
+    "search": "",
+    "username": ""
   }
 ]