diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 6a712f8e84a..3f9485883c0 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -48785,6 +48785,18 @@
      {}
     ]
    ],
+   "css/CSS2/floats/floated-table-wider-than-specified.html": [
+    [
+     "/css/CSS2/floats/floated-table-wider-than-specified.html",
+     [
+      [
+       "/css/reference/ref-filled-green-200px-square.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/CSS2/floats/floats-placement-vertical-001a.xht": [
     [
      "/css/CSS2/floats/floats-placement-vertical-001a.xht",
@@ -294093,6 +294105,11 @@
      {}
     ]
    ],
+   "webaudio/resources/delay-testing.js": [
+    [
+     {}
+    ]
+   ],
    "webaudio/resources/distance-model-testing.js": [
     [
      {}
@@ -315974,6 +315991,12 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/border-image-source.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/border-image-source.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/border-style.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/border-style.html",
@@ -315992,12 +316015,24 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/box-sizing.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/box-sizing.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/caret-color.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/caret-color.html",
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/clear.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/clear.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/color.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/color.html",
@@ -316016,6 +316051,24 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/float.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/float.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/font-style.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/font-style.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/font-weight.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/font-weight.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/height.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/height.html",
@@ -316028,12 +316081,30 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/line-height.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/line-height.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/list-style-position.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/list-style-position.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/margin.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/margin.html",
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/mask-image.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/mask-image.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/object-position.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/object-position.html",
@@ -316052,6 +316123,18 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/outline-style.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/outline-style.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/overflow.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/overflow.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/padding.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/padding.html",
@@ -316070,6 +316153,12 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/shape-outside.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/shape-outside.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/text-align.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/text-align.html",
@@ -316094,6 +316183,12 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/text-transform.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/text-transform.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/top.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/top.html",
@@ -316124,6 +316219,12 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/whitespace.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/whitespace.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/width.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/width.html",
@@ -327698,6 +327799,12 @@
      {}
     ]
    ],
+   "html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html": [
+    [
+     "/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html",
+     {}
+    ]
+   ],
    "html/infrastructure/safe-passing-of-structured-data/structured_clone_blob.html": [
     [
      "/html/infrastructure/safe-passing-of-structured-data/structured_clone_blob.html",
@@ -336642,6 +336749,26 @@
      {}
     ]
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+   "infrastructure/assumptions/non-secure-context.any.js": [
+    [
+     "/infrastructure/assumptions/non-secure-context.any.html",
+     {}
+    ],
+    [
+     "/infrastructure/assumptions/non-secure-context.any.worker.html",
+     {}
+    ]
+   ],
+   "infrastructure/assumptions/secure-context.https.any.js": [
+    [
+     "/infrastructure/assumptions/secure-context.https.any.html",
+     {}
+    ],
+    [
+     "/infrastructure/assumptions/secure-context.https.any.worker.html",
+     {}
+    ]
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     [
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@@ -362910,18 +363037,84 @@
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+    [
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+     {}
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+   "webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html",
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+   "webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html",
+     {}
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+   "webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html",
+     {}
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+   "webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html",
+     {}
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+   "webaudio/the-audio-api/the-delaynode-interface/delaynode.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/delaynode.html",
+     {}
+    ]
+   ],
    "webaudio/the-audio-api/the-delaynode-interface/idl-test.html": [
     [
      "/webaudio/the-audio-api/the-delaynode-interface/idl-test.html",
      {}
     ]
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+   "webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html": [
+    [
+     "/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html",
+     {}
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+   "webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html": [
+    [
+     "/webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html",
+     {}
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+    [
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+     {}
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+   "webaudio/the-audio-api/the-gainnode-interface/gain.html": [
+    [
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+     {}
+    ]
+   ],
    "webaudio/the-audio-api/the-gainnode-interface/idl-test.html": [
     [
      "/webaudio/the-audio-api/the-gainnode-interface/idl-test.html",
      {}
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+   "webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html": [
+    [
+     "/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html",
+     {}
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    "webaudio/the-audio-api/the-gainnode-interface/test-gainnode.html": [
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@@ -439531,6 +439724,10 @@
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    "support"
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+  "css/CSS2/floats/floated-table-wider-than-specified.html": [
+   "4081cd8860323434f2461673c39c872f7e9c55e2",
+   "reftest"
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   "css/CSS2/floats/floats-placement-vertical-001-ref.xht": [
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    "support"
@@ -506384,7 +506581,7 @@
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   "css/css-style-attr/style-attr-braces-002-quirks.htm": [
-   "134c9965cb75e87bb97a52040088755dbaf4eaa0",
+   "e96cc484f81fd01c4d9975445b7d00d08dd37441",
    "reftest"
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   "css/css-style-attr/style-attr-braces-002.xht": [
@@ -519855,6 +520052,10 @@
    "5b8adde602ac79d8b1ea92bd29f25d8756d72f8a",
    "testharness"
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+  "css/css-typed-om/the-stylepropertymap/properties/border-image-source.html": [
+   "08934e205f88aecda9809ff98d63f2d8784080c3",
+   "testharness"
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   "css/css-typed-om/the-stylepropertymap/properties/border-style.html": [
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@@ -519867,10 +520068,18 @@
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    "testharness"
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+  "css/css-typed-om/the-stylepropertymap/properties/box-sizing.html": [
+   "6fb5b014ffbbe4fe9c0019cea618a001fefdbedd",
+   "testharness"
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   "css/css-typed-om/the-stylepropertymap/properties/caret-color.html": [
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    "testharness"
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+  "css/css-typed-om/the-stylepropertymap/properties/clear.html": [
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+   "testharness"
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@@ -519883,6 +520092,18 @@
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+   "testharness"
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@@ -519891,10 +520112,22 @@
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    "testharness"
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+   "testharness"
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@@ -519907,6 +520140,14 @@
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    "testharness"
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+  "css/css-typed-om/the-stylepropertymap/properties/outline-style.html": [
+   "c9a622aacc8c61581110670cb7044a89b11956d4",
+   "testharness"
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+   "testharness"
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   "css/css-typed-om/the-stylepropertymap/properties/text-emphasis-color.html": [
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    "testharness"
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    "testharness"
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+   "testharness"
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@@ -558519,6 +558772,10 @@
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+  "html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html": [
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+   "testharness"
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@@ -568879,6 +569136,14 @@
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    "support"
   ],
   "interfaces/dom.idl": [
-   "773c449a2f9a6bd9e35d0dd8a4c2e1eaa0266150",
+   "605bb139c7695e46f8657097cf2d9bc6240a2d38",
    "support"
   ],
   "interfaces/fullscreen.idl": [
@@ -587688,7 +587953,7 @@
    "testharness"
   ],
   "screen-orientation/lock-bad-argument.html": [
-   "4d06c44e347ae7326e928ed0fd09b8ae3991e11b",
+   "89abd7337374b1cd4b1b33133e2f55d737f94d7c",
    "testharness"
   ],
   "screen-orientation/lock-basic.html": [
@@ -598019,6 +598284,10 @@
    "914a0268776de98f3b608babfa5699a93a2cd723",
    "support"
   ],
+  "webaudio/resources/delay-testing.js": [
+   "aeb4554e50589738c94600cc2ed1e84be7381cac",
+   "support"
+  ],
   "webaudio/resources/distance-model-testing.js": [
    "0be27d8bddd91a2c4c6e54d3b52af58bff2ed023",
    "support"
@@ -598183,26 +598452,70 @@
    "da39a3ee5e6b4b0d3255bfef95601890afd80709",
    "support"
   ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode-max-default-delay.html": [
+   "c732635549f5eab61f8bdce05b27f0f3e8a3f6c2",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html": [
+   "8c1a46ae95f921d78a59473c6f1f5d12315f07e8",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html": [
+   "d3ed5ccd10c62ca00edadcfd54cbe6a05ce2e1c0",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html": [
+   "2effacd5886d0af8c615f294fcd50dc4df8940f3",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html": [
+   "6f7c363e610fe141458b77d3ca7ec69bca8012a6",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-delaynode-interface/delaynode.html": [
+   "622ca5f882644f183674cc07e55a69e63e5c85d9",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-delaynode-interface/idl-test.html": [
    "8507a293b696d2d3fc51b429864373606a75eeb6",
    "testharness"
   ],
+  "webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html": [
+   "96b405fd00ee657194de348ea46b263ba43f98a4",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-dynamicscompressornode-interface/.gitkeep": [
    "da39a3ee5e6b4b0d3255bfef95601890afd80709",
    "support"
   ],
+  "webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html": [
+   "6ceaf50b8cacdfa246bc997f2c8e46aefd789659",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-gainnode-interface/.gitkeep": [
    "da39a3ee5e6b4b0d3255bfef95601890afd80709",
    "support"
   ],
+  "webaudio/the-audio-api/the-gainnode-interface/gain-basic.html": [
+   "70165c60c482d6507670af965756f639e7b3ba78",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-gainnode-interface/gain-expected.wav": [
    "823f7ae1a5f5eb0c630e7d1881c50a1f710f9350",
    "support"
   ],
+  "webaudio/the-audio-api/the-gainnode-interface/gain.html": [
+   "5f50c22eaa77f09d0fa8c6f6f5249fdbf7db4b24",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-gainnode-interface/idl-test.html": [
    "30843d3b74e8ec33bedd849f3f2b1bbd4bcc9f5e",
    "testharness"
   ],
+  "webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html": [
+   "2205ec8f56472bd45e102cf57f10b4532b18a554",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-gainnode-interface/test-gainnode.html": [
    "bf2de43e568c79b96fd5b0602e26346c483162a5",
    "testharness"
diff --git a/tests/wpt/metadata/css/CSS2/floats/floated-table-wider-than-specified.html.ini b/tests/wpt/metadata/css/CSS2/floats/floated-table-wider-than-specified.html.ini
new file mode 100644
index 00000000000..ffd8cc51603
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/floated-table-wider-than-specified.html.ini
@@ -0,0 +1,2 @@
+[floated-table-wider-than-specified.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/custom-elements/Document-createElement.html.ini b/tests/wpt/metadata/custom-elements/Document-createElement.html.ini
index d4651069a7a..228fc09afd7 100644
--- a/tests/wpt/metadata/custom-elements/Document-createElement.html.ini
+++ b/tests/wpt/metadata/custom-elements/Document-createElement.html.ini
@@ -5,3 +5,6 @@
   [document.createElement must create an instance of autonomous custom elements when it has is attribute]
     expected: FAIL
 
+  [document.createElement()'s second argument is to be ignored when it's a string]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/Document-createElementNS.html.ini b/tests/wpt/metadata/custom-elements/Document-createElementNS.html.ini
new file mode 100644
index 00000000000..eca647d1fac
--- /dev/null
+++ b/tests/wpt/metadata/custom-elements/Document-createElementNS.html.ini
@@ -0,0 +1,4 @@
+[Document-createElementNS.html]
+  [document.createElementNS()'s third argument is to be ignored when it's a string]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini b/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
index 09be798a7ed..22d65b148f1 100644
--- a/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
+++ b/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
@@ -29,3 +29,6 @@
   [RTCDataChannel.send: unpaired surrogate codepoint should be replaced with U+FFFD.]
     expected: FAIL
 
+  [RegisterPtotocolHandler URL: unpaired surrogate codepoint should not make any exceptions.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html.ini b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html.ini
new file mode 100644
index 00000000000..c3a5aed5e44
--- /dev/null
+++ b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html.ini
@@ -0,0 +1,4 @@
+[structured_clone_bigint.html]
+  [2.7 Safe passing of structured data]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/user-interface/muted.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/user-interface/muted.html.ini
index c7c2988c68f..ff3c9651fdc 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/user-interface/muted.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/user-interface/muted.html.ini
@@ -63,3 +63,15 @@
   [getting video.muted with muted="" (document.write-created)]
     expected: FAIL
 
+  [cloning audio propagates muted (script-created)]
+    expected: FAIL
+
+  [cloning audio propagates muted (innerHTML-created)]
+    expected: FAIL
+
+  [cloning video propagates muted (script-created)]
+    expected: FAIL
+
+  [cloning video propagates muted (innerHTML-created)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_01.htm.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_01.htm.ini
index f983f5be3c4..25da6e476ff 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_01.htm.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_01.htm.ini
@@ -1,6 +1,5 @@
 [iframe_javascript_url_01.htm]
   type: testharness
-  expected: TIMEOUT
   [javascript: URL creating a document in an about:blank iframe]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/glsl/misc/shader-with-non-reserved-words.html.ini b/tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/glsl/misc/shader-with-non-reserved-words.html.ini
index c508ae3ae71..ad64e1afe0b 100644
--- a/tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/glsl/misc/shader-with-non-reserved-words.html.ini
+++ b/tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/glsl/misc/shader-with-non-reserved-words.html.ini
@@ -1,5 +1,6 @@
 [shader-with-non-reserved-words.html]
   type: testharness
+  expected: TIMEOUT
   [WebGL test #1696: shader with: 'dmat2' failed to compile]
     expected: FAIL
 
@@ -144,3 +145,6 @@
   [WebGL test #1862: shader with: 'dmat4x4' failed to compile]
     expected: FAIL
 
+  [Overall test]
+    expected: NOTRUN
+
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats/floated-table-wider-than-specified.html b/tests/wpt/web-platform-tests/css/CSS2/floats/floated-table-wider-than-specified.html
new file mode 100644
index 00000000000..f93d50e43dd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats/floated-table-wider-than-specified.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>Floated table that becomes wider than its specified width, due to wide contents</title>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#float-width" title="10.3.5 Floating, non-replaced elements">
+<link rel="help" href="https://www.w3.org/TR/CSS22/tables.html#auto-table-layout" title="17.5.2.2 Automatic table layout">
+<link rel="match" href="../../reference/ref-filled-green-200px-square.html">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="width:200px; height:200px; background:red;">
+  <div style="width:300px;">
+    <div style="float:left; width:200px; height:100px; margin-right:10px; background:green;"></div>
+    <div style="float:left; display:table; width:50px; height:10px; background:green;">
+      <div style="width:200px; height:100px;"></div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-style-attr/style-attr-braces-002-quirks.htm b/tests/wpt/web-platform-tests/css/css-style-attr/style-attr-braces-002-quirks.htm
index d3465d8a297..7b74d8f1f77 100644
--- a/tests/wpt/web-platform-tests/css/css-style-attr/style-attr-braces-002-quirks.htm
+++ b/tests/wpt/web-platform-tests/css/css-style-attr/style-attr-braces-002-quirks.htm
@@ -8,7 +8,7 @@
   <meta name="assert" content="Style attribute values are the content of a
     declaration block: the braces must not be included and are therefore invalid."/>
   <style type="text/css">
-    p { background: lime; color: green; }
+    p { background: lime; color: green; margin-top: 1em; }
   </style>
  </head>
  <body>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/border-image-source.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/border-image-source.html
new file mode 100644
index 00000000000..b9ddf19ff2e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/border-image-source.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'border-image-source' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('border-image-source', [
+  { syntax: 'none' },
+  { syntax: '<image>' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/box-sizing.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/box-sizing.html
new file mode 100644
index 00000000000..551adbfe4f7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/box-sizing.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'box-sizing' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('box-sizing', [
+  { syntax: 'content-box'},
+  { syntax: 'border-box' }
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/clear.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/clear.html
new file mode 100644
index 00000000000..3852dd2542b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/clear.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'clear' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('clear', [
+  { syntax: 'none' },
+  { syntax: 'left' },
+  { syntax: 'right' },
+  { syntax: 'both' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/float.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/float.html
new file mode 100644
index 00000000000..569bae34390
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/float.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'float' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('float', [
+  { syntax: 'left' },
+  { syntax: 'right' },
+  { syntax: 'none' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-style.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-style.html
new file mode 100644
index 00000000000..c361e21f42a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-style.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'font-style' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('font-style', [
+  { syntax: 'normal' },
+  { syntax: 'italic' },
+  { syntax: 'oblique' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-weight.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-weight.html
new file mode 100644
index 00000000000..cd6bec30df2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/font-weight.html
@@ -0,0 +1,50 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'font-weight' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+function assert_is_font_weight(weight, result) {
+  assert_style_value_equals(result, new CSSUnitValue(weight, 'number'));
+}
+
+runPropertyTests('font-weight', [
+  {
+    syntax: 'normal',
+    computed: (_, result) => assert_is_font_weight(400, result)
+  },
+  {
+    syntax: 'bold',
+    computed: (_, result) => assert_is_font_weight(700, result)
+  },
+  {
+    syntax: 'bolder',
+    computed: (_, result) => assert_is_unit('number', result)
+  },
+  {
+    syntax: 'lighter',
+    computed: (_, result) => assert_is_unit('number', result)
+  },
+  {
+    syntax: '<number>',
+    specified: (input, result) => {
+      if (input instanceof CSSUnitValue &&
+          (input.value < 0 || input.value > 1000))
+        assert_style_value_equals(result, new CSSMathSum(input));
+      else
+        assert_style_value_equals(result, input);
+    }
+  },
+]);
+
+</script>
+
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/line-height.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/line-height.html
new file mode 100644
index 00000000000..4e35eaf786a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/line-height.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'line-height' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('line-height', [
+  { syntax: 'normal' },
+  {
+    syntax: '<length>',
+    specified: assert_is_equal_with_range_handling,
+    computed: (_, result) => assert_is_unit('px', result)
+  },
+  {
+    syntax: '<number>',
+    specified: assert_is_equal_with_range_handling,
+    computed: (_, result) => assert_is_unit('px', result)
+  },
+  {
+    syntax: '<percentage>',
+    specified: assert_is_equal_with_range_handling,
+    computed: (_, result) => assert_is_unit('px', result)
+  },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/list-style-position.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/list-style-position.html
new file mode 100644
index 00000000000..3c6724fcb6f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/list-style-position.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'list-style-position' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('list-style-position', [
+  { syntax: 'inside' },
+  { syntax: 'outside' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/mask-image.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/mask-image.html
new file mode 100644
index 00000000000..f306fdde92b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/mask-image.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'mask-image' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+// FIXME: mask-image is list-valued. Run list-valued tests here too.
+runPropertyTests('mask-image', [
+  { syntax: 'none' },
+  { syntax: '<image>' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/outline-style.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/outline-style.html
new file mode 100644
index 00000000000..2d793f36ae6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/outline-style.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'outline-style' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('outline-style', [
+  { syntax: 'auto' },
+  { syntax: 'none' },
+  { syntax: 'dotted' },
+  { syntax: 'dashed' },
+  { syntax: 'solid' },
+  { syntax: 'double' },
+  { syntax: 'groove' },
+  { syntax: 'ridge' },
+  { syntax: 'inset' },
+  { syntax: 'outset' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/overflow.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/overflow.html
new file mode 100644
index 00000000000..a4692fc178d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/overflow.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'overflow' properties</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+for (const suffix of ['x', 'y']) {
+  runPropertyTests(`overflow-${suffix}`, [
+    { syntax: 'visible' },
+    { syntax: 'hidden' },
+    { syntax: 'clip' },
+    { syntax: 'scroll' },
+    { syntax: 'auto' },
+  ]);
+}
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/shape-outside.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/shape-outside.html
new file mode 100644
index 00000000000..d514c838068
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/shape-outside.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'shape-outside' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('shape-outside', [
+  { syntax: 'none' },
+  { syntax: 'margin-box' },
+  { syntax: 'border-box' },
+  { syntax: 'padding-box' },
+  { syntax: 'content-box' },
+  { syntax: '<image>' },
+]);
+
+// <basic-shape>s are not supported in level 1
+runUnsupportedPropertyTests('shape-outside', [
+  'inset(22% 12% 15px 35px)',
+  'circle(6rem at 12rem 6rem)',
+  'ellipse(115px 55px at 50% 40%)',
+  'polygon(50% 20%, 90% 80%, 10% 80%)',
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-decoration-style.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-decoration-style.html
index 6bed8b625a4..956c6e578b0 100644
--- a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-decoration-style.html
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-decoration-style.html
@@ -16,7 +16,9 @@
 runPropertyTests('text-decoration-style', [
   { syntax: 'solid' },
   { syntax: 'double' },
-  // and other keywords
+  { syntax: 'dotted' },
+  { syntax: 'dashed' },
+  { syntax: 'wavy' },
 ]);
 
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-transform.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-transform.html
new file mode 100644
index 00000000000..7d6e9c35774
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/text-transform.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'text-transform' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('text-transform', [
+  { syntax: 'none' },
+  { syntax: 'captialize' },
+  { syntax: 'uppercase' },
+  { syntax: 'lowercase' },
+  { syntax: 'full-width' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html
index 4cfcf6576db..42a020d313a 100644
--- a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html
@@ -15,8 +15,8 @@
 
 runPropertyTests('visibility', [
   { syntax: 'visible'},
-  { syntax: 'hidden' }
-  // and other keywords
+  { syntax: 'hidden' },
+  { syntax: 'collapse' },
 ]);
 
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/whitespace.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/whitespace.html
new file mode 100644
index 00000000000..f050da2839e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/whitespace.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'white-space' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('white-space', [
+  { syntax: 'normal'},
+  { syntax: 'pre' },
+  { syntax: 'nowrap' },
+  { syntax: 'pre-wrap' },
+  { syntax: 'pre-line' },
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/custom-elements/Document-createElement.html b/tests/wpt/web-platform-tests/custom-elements/Document-createElement.html
index 21f024c5735..ad29b91d88d 100644
--- a/tests/wpt/web-platform-tests/custom-elements/Document-createElement.html
+++ b/tests/wpt/web-platform-tests/custom-elements/Document-createElement.html
@@ -50,6 +50,21 @@ test(function () {
     assert_true(instance2 instanceof DefinedLater);
 }, 'document.createElement must create an instance of autonomous custom elements when it has is attribute');
 
+test(() => {
+    class SuperP extends HTMLParagraphElement {}
+    customElements.define("super-p", SuperP, { extends: "p" });
+
+    const superP = document.createElement("p", { is: "super-p" });
+    assert_true(superP instanceof HTMLParagraphElement);
+    assert_true(superP instanceof SuperP);
+    assert_equals(superP.localName, "p");
+
+    const notSuperP = document.createElement("p", "super-p");
+    assert_true(notSuperP instanceof HTMLParagraphElement);
+    assert_false(notSuperP instanceof SuperP);
+    assert_equals(notSuperP.localName, "p");
+}, "document.createElement()'s second argument is to be ignored when it's a string");
+
 function assert_reports(expected, testFunction, message) {
     var uncaughtError = null;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
diff --git a/tests/wpt/web-platform-tests/custom-elements/Document-createElementNS.html b/tests/wpt/web-platform-tests/custom-elements/Document-createElementNS.html
index 4cc4561f54c..6377ba63fca 100644
--- a/tests/wpt/web-platform-tests/custom-elements/Document-createElementNS.html
+++ b/tests/wpt/web-platform-tests/custom-elements/Document-createElementNS.html
@@ -49,5 +49,20 @@ test(() => {
   assert_false(element instanceof MyBuiltinElement2);
   assert_false(element.hasAttribute('is'));
 }, 'builtin: document.createElementNS should check namespaces.');
+
+test(() => {
+    class SuperP extends HTMLParagraphElement {}
+    customElements.define("super-p", SuperP, { extends: "p" });
+
+    const superP = document.createElementNS("http://www.w3.org/1999/xhtml", "p", { is: "super-p" });
+    assert_true(superP instanceof HTMLParagraphElement);
+    assert_true(superP instanceof SuperP);
+    assert_equals(superP.localName, "p");
+
+    const notSuperP = document.createElementNS("http://www.w3.org/1999/xhtml", "p", "super-p");
+    assert_true(notSuperP instanceof HTMLParagraphElement);
+    assert_false(notSuperP instanceof SuperP);
+    assert_equals(notSuperP.localName, "p");
+}, "document.createElementNS()'s third argument is to be ignored when it's a string");
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/docs/_running-tests/chrome_android.md b/tests/wpt/web-platform-tests/docs/_running-tests/chrome_android.md
index 62a2028eb4e..cf05a59425a 100644
--- a/tests/wpt/web-platform-tests/docs/_running-tests/chrome_android.md
+++ b/tests/wpt/web-platform-tests/docs/_running-tests/chrome_android.md
@@ -1,9 +1,9 @@
-To run WPT on Chrome on an android device, some additional set up is required.
+To run WPT on Chrome on an Android device, some additional set up is required.
 
 First of all, as usual Android development, we need to have `adb` and be able to
 connect to the device.
 
-Furthermore, until we find a better way, we need to root the android device and
+Furthermore, until we find a better way, we need to root the Android device and
 update the /etc/hosts file to include
 
 ```
diff --git a/tests/wpt/web-platform-tests/docs/_writing-tests/index.md b/tests/wpt/web-platform-tests/docs/_writing-tests/index.md
index 6454eb1edac..3922d7a4cc4 100644
--- a/tests/wpt/web-platform-tests/docs/_writing-tests/index.md
+++ b/tests/wpt/web-platform-tests/docs/_writing-tests/index.md
@@ -40,6 +40,9 @@ first two, and it is at times advisable to use testharness.js tests
 for things which would typically be tested using reftests but for
 which it would be overly cumbersome.
 
+See [file names][] for test types and features determined by the file names,
+and [server features][] for advanced testing features.
+
 In addition to the four main test types, there are also WebDriver
 tests, which are used exclusively for testing the WebDriver protocol
 itself. There is currently no documentation about these tests,
@@ -52,8 +55,10 @@ the [typical GitHub Pull Request workflow][submission-process]; please
 make sure you run the [`lint` script][lint-tool] before opening a pull request!
 
 [introduction]: {{ site.baseurl }}{% link introduction.md %}
+[file names]: {{ site.baseurl }}{% link _writing-tests/file-names.md %}
 [general guidelines]: {{ site.baseurl }}{% link _writing-tests/general-guidelines.md %}
 [reftests]: {{ site.baseurl }}{% link _writing-tests/reftests.md %}
+[server features]: {{ site.baseurl }}{% link _writing-tests/server-features.md %}
 [testharness.js]: {{ site.baseurl }}{% link _writing-tests/testharness.md %}
 [visual]: {{ site.baseurl }}{% link _writing-tests/visual.md %}
 [manual]: {{ site.baseurl }}{% link _writing-tests/manual.md %}
diff --git a/tests/wpt/web-platform-tests/docs/_writing-tests/server-features.md b/tests/wpt/web-platform-tests/docs/_writing-tests/server-features.md
index b8f50ab2e4f..495426a8e2a 100644
--- a/tests/wpt/web-platform-tests/docs/_writing-tests/server-features.md
+++ b/tests/wpt/web-platform-tests/docs/_writing-tests/server-features.md
@@ -8,8 +8,8 @@ order: 12
 
 Certain test scenarios require more than just static HTML
 generation. This is supported through the
-[wptserve](http://wptserve.readthedocs.io) server. Several scenarios
-in particular are common:
+[wptserve](http://wptserve.readthedocs.io) server, and controlled by
+[file name flags][file names]. Several scenarios in particular are common:
 
 
 ### Tests Involving Multiple Origins
@@ -85,3 +85,6 @@ responses. It also provides the ability to write Python scripts that
 have access to request data and can manipulate the content and timing
 of the response. For details see the
 [wptserve documentation](https://wptserve.readthedocs.org).
+
+
+[file names]: {{ site.baseurl }}{% link _writing-tests/file-names.md %}
diff --git a/tests/wpt/web-platform-tests/docs/_writing-tests/testharness.md b/tests/wpt/web-platform-tests/docs/_writing-tests/testharness.md
index 84aef5887b6..96a36ceb5e2 100644
--- a/tests/wpt/web-platform-tests/docs/_writing-tests/testharness.md
+++ b/tests/wpt/web-platform-tests/docs/_writing-tests/testharness.md
@@ -16,8 +16,8 @@ documented in two sections:
   * [idlharness.js Documentation][idlharness] — A library for testing
      IDL interfaces using `testharness.js`.
 
-As always, we recommend reading over the [general guidelines][] for
-all test types.
+See [server features][] for advanced testing features that are commonly used
+with testharness.js. See also the [general guidelines][] for all test types.
 
 ## Auto-generated test boilerplate
 
@@ -103,3 +103,4 @@ Use `// META: timeout=long` at the beginning of the resource.
 [general guidelines]: {{ site.baseurl }}{% link _writing-tests/general-guidelines.md %}
 [testharness-api]: {{ site.baseurl }}{% link _writing-tests/testharness-api.md %}
 [idlharness]: {{ site.baseurl }}{% link _writing-tests/idlharness.md %}
+[server features]: {{ site.baseurl }}{% link _writing-tests/server-features.md %}
diff --git a/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html b/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
index edbf4e2442b..b9c06d824ec 100644
--- a/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
+++ b/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
@@ -104,10 +104,18 @@ test(() => {
   }
 }, "sendBeacon URL: unpaired surrogate codepoint should not make any exceptions.")
 
+test(() => {
+  // This shouldn't throw an exception.
+  window.navigator.registerProtocolHandler('web+myprotocol', "custom-scheme\uD800/url=%s", "title");
+}, "RegisterPtotocolHandler URL: unpaired surrogate codepoint should not make any exceptions.")
+
 test(() => {
   var w = window.open("about:blank#\uD800");
   assert_equals(w.document.URL, 'about:blank#%EF%BF%BD');
   assert_equals(w.document.documentURI, 'about:blank#%EF%BF%BD');
+  // TODO(gyuyoung): How to test document.origin? When opening a URL with an
+  // unpaired surrogate codepoint, invalid URL exception happens.
+  //   e.g) var w = window.open("http://test.com\uDB89");
 }, "Document URLs: unpaired surrogate codepoint should be replaced with U+FFFD")
 
 promise_test(t => {
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html
new file mode 100644
index 00000000000..e51837b6ffc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html
@@ -0,0 +1,76 @@
+<!doctype html>
+<html>
+ <head>
+  <meta content="text/html; charset=utf-8" http-equiv="content-type" />
+  <title>2.7 Safe passing of structured data</title>
+  <link rel="help" href="https://html.spec.whatwg.org/multipage/#safe-passing-of-structured-data" />
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+ <div id="log"></div>
+
+<script type="text/javascript">
+    // Note, this test is designed to be in a similar style to
+    // html/infrastructure/safe-passing-of-structured-data/structuredclone_0.html
+    // It is in a separate file to avoid causing a syntax error on UAs which
+    // do not yet support BigInt, so the rest of the test can continue running.
+
+    var worker;
+    var testCollection;
+    setup(function()
+    {
+        //the worker is used for each test in sequence
+        //worker's callback will be set for each test
+        //worker's internal onmessage echoes the data back to this thread through postMessage
+        worker = new Worker("./echo.js");
+        testCollection = [
+            function() {
+                var t = async_test("Primitive BigInt is cloned");
+                t.id = 0;
+                worker.onmessage = t.step_func(function(e) {assert_equals(1n, e.data, "1n === event.data"); t.done(); });
+                t.step(function() { worker.postMessage(1n);});
+            },
+            function() {
+                var t = async_test("Instance of BigInt is cloned");
+                t.id = 1;
+                var obj;
+                t.step(function() {obj = Object(1n);});
+                worker.onmessage = t.step_func(function(e) {
+                    assert_equals(obj.constructor, e.data.constructor, "BigInt === event.data.constructor");
+                    assert_equals(obj.valueOf(), e.data.valueOf(), "(BigInt(1n)).valueOf() === event.data.valueOf()");
+                    t.done();
+                });
+                t.step(function() { worker.postMessage(obj);});
+            },
+        ];
+    }, {explicit_done:true});
+
+    //Callback for result_callback
+    //queues the next test in the array testCollection
+    //serves to make test execution sequential from the async worker callbacks
+    //alternatively, we would have to create a worker for each test
+    function testFinished(test) {
+        if(test.id < testCollection.length - 1) {
+            //queue the function so that stack remains shallow
+            queue(testCollection[test.id+1]);
+        } else {
+            //when the last test has run, explicitly end test suite
+            done();
+        }
+    }
+    function queue(func) {
+        step_timeout(func, 10);
+    }
+
+    add_result_callback(testFinished);
+    //start the first test manually
+    queue(testCollection[0]);
+
+
+
+
+ </script>
+</body>
+</html>
+
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/user-interface/muted.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/user-interface/muted.html
index 906350d88c8..eb6d2ac688d 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/user-interface/muted.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/user-interface/muted.html
@@ -148,5 +148,22 @@ async_test(function(t) {
     assert_true(m.hasAttribute('muted'));
     assert_true(m.muted);
   }, 'getting ' + tagName + '.muted with muted="" (document.write-created)');
+
+  test(function() {
+    var m = document.createElement(tagName);
+    m.setAttribute('muted', '');
+
+    var c = m.cloneNode(true);
+    assert_true(c.muted);
+  }, 'cloning ' + tagName + ' propagates muted (script-created)');
+
+  test(function() {
+    var div = document.createElement('div');
+    div.innerHTML = '<' + tagName + ' muted>';
+    m = div.firstChild;
+
+    var c = m.cloneNode(true);
+    assert_true(c.muted);
+  }, 'cloning ' + tagName + ' propagates muted (innerHTML-created)');
 });
 </script>
diff --git a/tests/wpt/web-platform-tests/infrastructure/assumptions/html-elements.html b/tests/wpt/web-platform-tests/infrastructure/assumptions/html-elements.html
index 6be17b1aba2..1cfe1d1fee5 100644
--- a/tests/wpt/web-platform-tests/infrastructure/assumptions/html-elements.html
+++ b/tests/wpt/web-platform-tests/infrastructure/assumptions/html-elements.html
@@ -10,7 +10,7 @@
 div.b {
   all: initial;
   direction: initial;
-  unicode-bidi: initial;
+  unicode-bidi: isolate;
   display: block;
 }
 
diff --git a/tests/wpt/web-platform-tests/infrastructure/assumptions/non-secure-context.any.js b/tests/wpt/web-platform-tests/infrastructure/assumptions/non-secure-context.any.js
new file mode 100644
index 00000000000..c05689fe760
--- /dev/null
+++ b/tests/wpt/web-platform-tests/infrastructure/assumptions/non-secure-context.any.js
@@ -0,0 +1,9 @@
+test(() => {
+  assert_false(self.isSecureContext);
+}, "Lack of .https file name flag implies non-secure context");
+
+test(() => {
+  assert_equals(location.protocol, "http:");
+}, "Lack of .https file name flag implies HTTP scheme");
+
+done();
diff --git a/tests/wpt/web-platform-tests/infrastructure/assumptions/secure-context.https.any.js b/tests/wpt/web-platform-tests/infrastructure/assumptions/secure-context.https.any.js
new file mode 100644
index 00000000000..99f6c4c0894
--- /dev/null
+++ b/tests/wpt/web-platform-tests/infrastructure/assumptions/secure-context.https.any.js
@@ -0,0 +1,9 @@
+test(() => {
+  assert_true(self.isSecureContext);
+}, "Use of .https file name flag implies secure context");
+
+test(() => {
+  assert_equals(location.protocol, "https:");
+}, "Use of .https file name flag implies HTTPS scheme");
+
+done();
diff --git a/tests/wpt/web-platform-tests/interfaces/dom.idl b/tests/wpt/web-platform-tests/interfaces/dom.idl
index 90419f083f8..e97f803f821 100644
--- a/tests/wpt/web-platform-tests/interfaces/dom.idl
+++ b/tests/wpt/web-platform-tests/interfaces/dom.idl
@@ -266,8 +266,8 @@ interface Document : Node {
   HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
   HTMLCollection getElementsByClassName(DOMString classNames);
 
-  [NewObject] Element createElement(DOMString localName, optional ElementCreationOptions options);
-  [NewObject] Element createElementNS(DOMString? namespace, DOMString qualifiedName, optional ElementCreationOptions options);
+  [NewObject] Element createElement(DOMString localName, optional (DOMString or ElementCreationOptions) options);
+  [NewObject] Element createElementNS(DOMString? namespace, DOMString qualifiedName, optional (DOMString or ElementCreationOptions) options);
   [NewObject] DocumentFragment createDocumentFragment();
   [NewObject] Text createTextNode(DOMString data);
   [NewObject] CDATASection createCDATASection(DOMString data);
diff --git a/tests/wpt/web-platform-tests/screen-orientation/lock-bad-argument.html b/tests/wpt/web-platform-tests/screen-orientation/lock-bad-argument.html
index df27ac21d29..222b9ab5f94 100644
--- a/tests/wpt/web-platform-tests/screen-orientation/lock-bad-argument.html
+++ b/tests/wpt/web-platform-tests/screen-orientation/lock-bad-argument.html
@@ -4,69 +4,24 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
+promise_test(t => {
+  const invalid_lock_types = [
+    "invalid-orientation",
+    null,
+    undefined,
+    123,
+    window,
+    ["portrait-primary", "landscape-primary"],
+  ];
+  const promisesToReject = invalid_lock_types.map(type =>
+    promise_rejects(t, new TypeError(), screen.orientation.lock(type))
+  );
+  return Promise.all(promisesToReject);
+}, "screen.orientation.lock() must throw given invalid input.");
 
-var test = async_test("Test that screen.orientation.lock() throws when the input isn't valid.");
-
-function onOrientationChangeEvent(ev) {
-    assert_unreached('Unexpected orientation change');
-}
-
-window.screen.orientation.addEventListener('change', test.step_func(onOrientationChangeEvent));
-
-test.step(function() {
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock('invalid-orientation');
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(null);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(undefined);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(undefined);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(123);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(window);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(['portrait-primary']);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock(['portrait-primary', 'landscape-primary']);
-    });
-
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    assert_throws(new TypeError(), function() {
-        screen.orientation.lock();
-    });
-});
-
-// Finish asynchronously to give events a chance to fire.
-setTimeout(test.step_func(function() {
-    assert_equals(screen.orientation.type, 'portrait-primary');
-    screen.orientation.unlock();
-    test.done();
-}));
-
+promise_test(t => {
+  return promise_rejects(t, new TypeError(), screen.orientation.lock());
+}, "screen.orientation.lock() must throw when the input is missing.");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/tools/wpt/browser.py b/tests/wpt/web-platform-tests/tools/wpt/browser.py
index 86580f9c58b..18eadffbbf7 100644
--- a/tests/wpt/web-platform-tests/tools/wpt/browser.py
+++ b/tests/wpt/web-platform-tests/tools/wpt/browser.py
@@ -45,12 +45,6 @@ class Browser(object):
         """Name of the browser-specific wptrunner requirements file"""
         return NotImplemented
 
-    def prepare_environment(self):
-        """Do any additional setup of the environment required to start the
-           browser successfully
-        """
-        pass
-
 
 class Firefox(Browser):
     """Firefox-specific interface.
@@ -262,26 +256,6 @@ class Chrome(Browser):
         output = call(self.binary, "--version")
         return re.search(r"[0-9\.]+( [a-z]+)?$", output.strip()).group(0)
 
-    def prepare_environment(self):
-        # https://bugs.chromium.org/p/chromium/issues/detail?id=713947
-        logger.debug("DBUS_SESSION_BUS_ADDRESS %s" % os.environ.get("DBUS_SESSION_BUS_ADDRESS"))
-        if "DBUS_SESSION_BUS_ADDRESS" not in os.environ:
-            if find_executable("dbus-launch"):
-                logger.debug("Attempting to start dbus")
-                dbus_conf = subprocess.check_output(["dbus-launch"])
-                logger.debug(dbus_conf)
-
-                # From dbus-launch(1):
-                #
-                # > When dbus-launch prints bus information to standard output,
-                # > by default it is in a simple key-value pairs format.
-                for line in dbus_conf.strip().split("\n"):
-                    key, _, value = line.partition("=")
-                    os.environ[key] = value
-            else:
-                logger.critical("dbus not running and can't be started")
-                sys.exit(1)
-
 
 class ChromeAndroid(Browser):
     """Chrome-specific interface for Android.
@@ -364,26 +338,6 @@ class Opera(Browser):
         output = call(self.binary, "--version")
         return re.search(r"[0-9\.]+( [a-z]+)?$", output.strip()).group(0)
 
-    def prepare_environment(self):
-        # https://bugs.chromium.org/p/chromium/issues/detail?id=713947
-        logger.debug("DBUS_SESSION_BUS_ADDRESS %s" % os.environ.get("DBUS_SESSION_BUS_ADDRESS"))
-        if "DBUS_SESSION_BUS_ADDRESS" not in os.environ:
-            if find_executable("dbus-launch"):
-                logger.debug("Attempting to start dbus")
-                dbus_conf = subprocess.check_output(["dbus-launch"])
-                logger.debug(dbus_conf)
-
-                # From dbus-launch(1):
-                #
-                # > When dbus-launch prints bus information to standard output,
-                # > by default it is in a simple key-value pairs format.
-                for line in dbus_conf.strip().split("\n"):
-                    key, _, value = line.partition("=")
-                    os.environ[key] = value
-            else:
-                logger.critical("dbus not running and can't be started")
-                sys.exit(1)
-
 
 class Edge(Browser):
     """Edge-specific interface."""
diff --git a/tests/wpt/web-platform-tests/webaudio/resources/delay-testing.js b/tests/wpt/web-platform-tests/webaudio/resources/delay-testing.js
new file mode 100644
index 00000000000..9033da6730f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/resources/delay-testing.js
@@ -0,0 +1,66 @@
+let sampleRate = 44100.0;
+
+let renderLengthSeconds = 4;
+let delayTimeSeconds = 0.5;
+let toneLengthSeconds = 2;
+
+function createToneBuffer(context, frequency, numberOfCycles, sampleRate) {
+  let duration = numberOfCycles / frequency;
+  let sampleFrameLength = duration * sampleRate;
+
+  let audioBuffer = context.createBuffer(1, sampleFrameLength, sampleRate);
+
+  let n = audioBuffer.length;
+  let data = audioBuffer.getChannelData(0);
+
+  for (let i = 0; i < n; ++i)
+    data[i] = Math.sin(frequency * 2.0 * Math.PI * i / sampleRate);
+
+  return audioBuffer;
+}
+
+function checkDelayedResult(renderedBuffer, toneBuffer, should) {
+  let sourceData = toneBuffer.getChannelData(0);
+  let renderedData = renderedBuffer.getChannelData(0);
+
+  let delayTimeFrames = delayTimeSeconds * sampleRate;
+  let toneLengthFrames = toneLengthSeconds * sampleRate;
+
+  let success = true;
+
+  let n = renderedBuffer.length;
+
+  for (let i = 0; i < n; ++i) {
+    if (i < delayTimeFrames) {
+      // Check that initial portion is 0 (since signal is delayed).
+      if (renderedData[i] != 0) {
+        should(
+            renderedData[i], 'Initial portion expected to be 0 at frame ' + i)
+            .beEqualTo(0);
+        success = false;
+        break;
+      }
+    } else if (i >= delayTimeFrames && i < delayTimeFrames + toneLengthFrames) {
+      // Make sure that the tone data is delayed by exactly the expected number
+      // of frames.
+      let j = i - delayTimeFrames;
+      if (renderedData[i] != sourceData[j]) {
+        should(renderedData[i], 'Actual data at frame ' + i)
+            .beEqualTo(sourceData[j]);
+        success = false;
+        break;
+      }
+    } else {
+      // Make sure we have silence after the delayed tone.
+      if (renderedData[i] != 0) {
+        should(renderedData[j], 'Final portion at frame ' + i).beEqualTo(0);
+        success = false;
+        break;
+      }
+    }
+  }
+
+  should(
+      success, 'Delaying test signal by ' + delayTimeSeconds + ' sec was done')
+      .message('correctly', 'incorrectly')
+}
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-default-delay.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-default-delay.html
new file mode 100644
index 00000000000..ef526c96ffc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-default-delay.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode-max-default-delay.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description: 'DelayNode with delay set to default maximum delay'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            let delay = context.createDelay();
+            delayTimeSeconds = 1;
+            delay.delayTime.value = delayTimeSeconds;
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(() => task.done());
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html
new file mode 100644
index 00000000000..3be07255e15
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-max-nondefault-delay.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode-max-nondefault-delay.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description: 'DelayNode with delay set to non-default maximum delay'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            let maxDelay = 1.5;
+            let delay = context.createDelay(maxDelay);
+            delayTimeSeconds = maxDelay;
+            delay.delayTime.value = delayTimeSeconds;
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(() => task.done());
+            ;
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html
new file mode 100644
index 00000000000..a43ceeb7be9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelay.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode-maxdelay.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description:
+                'Basic functionality of DelayNode with a non-default max delay time'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            // Create a delay node with an explicit max delay time (greater than
+            // the default of 1 second).
+            let delay = context.createDelay(2);
+            // Set the delay time to a value greater than the default max delay
+            // so we can verify the delay is working for this case.
+            delayTimeSeconds = 1.5;
+            delay.delayTime.value = delayTimeSeconds;
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(() => task.done());
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html
new file mode 100644
index 00000000000..3f4c0208fdd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-maxdelaylimit.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode-maxdelaylimit.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description:
+                'Tests attribute and maximum allowed delay of DelayNode'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            window.context = context;
+            should(() => context.createDelay(180)).throw();
+            should(() => context.createDelay(0)).throw();
+            should(() => context.createDelay(-1)).throw();
+            should(() => context.createDelay(NaN)).throw();
+            ;
+            let delay = context.createDelay(179);
+            delay.delayTime.value = delayTimeSeconds;
+            window.delay = delay;
+            should(
+                delay.delayTime.value,
+                'delay.delayTime.value = ' + delayTimeSeconds)
+                .beEqualTo(delayTimeSeconds);
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(() => task.done());
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html
new file mode 100644
index 00000000000..af6c54950a1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode-scheduling.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode-scheduling.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description:
+                'DelayNode delayTime parameter can be scheduled at a given time'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            let delay = context.createDelay();
+
+            // Schedule delay time at time zero.
+            delay.delayTime.setValueAtTime(delayTimeSeconds, 0);
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(() => task.done());
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode.html
new file mode 100644
index 00000000000..da508e439fb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/delaynode.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      delaynode.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/delay-testing.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'test',
+            description: 'Tests attribute and basic functionality of DelayNode'
+          },
+          function(task, should) {
+
+            // Create offline audio context.
+            let context = new OfflineAudioContext(
+                1, sampleRate * renderLengthSeconds, sampleRate);
+            let toneBuffer = createToneBuffer(
+                context, 20, 20 * toneLengthSeconds, sampleRate);  // 20Hz tone
+
+            let bufferSource = context.createBufferSource();
+            bufferSource.buffer = toneBuffer;
+
+            let delay = context.createDelay();
+
+            window.delay = delay;
+            should(delay.numberOfInputs, 'delay.numberOfInputs').beEqualTo(1);
+            should(delay.numberOfOutputs, 'delay.numberOfOutputs').beEqualTo(1);
+            should(delay.delayTime.defaultValue, 'delay.delayTime.defaultValue')
+                .beEqualTo(0.0);
+            should(delay.delayTime.value, 'delay.delayTime.value')
+                .beEqualTo(0.0);
+
+            delay.delayTime.value = delayTimeSeconds;
+            should(
+                delay.delayTime.value,
+                'delay.delayTime.value = ' + delayTimeSeconds)
+                .beEqualTo(delayTimeSeconds);
+
+            bufferSource.connect(delay);
+            delay.connect(context.destination);
+            bufferSource.start(0);
+
+            context.startRendering()
+                .then(buffer => checkDelayedResult(buffer, toneBuffer, should))
+                .then(task.done.bind(task));
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html
new file mode 100644
index 00000000000..7857cf16aa0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html
@@ -0,0 +1,183 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test DelayNode Has No Dezippering
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      // The sample rate must be a power of two to avoid any round-off errors in
+      // computing when to suspend a context on a rendering quantum boundary.
+      // Otherwise this is pretty arbitrary.
+      let sampleRate = 16384;
+
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {label: 'test0', description: 'Test DelayNode has no dezippering'},
+          (task, should) => {
+            let context = new OfflineAudioContext(1, sampleRate, sampleRate);
+
+            // Simple integer ramp for testing delay node
+            let buffer = new AudioBuffer(
+                {length: context.length, sampleRate: context.sampleRate});
+            let rampData = buffer.getChannelData(0);
+            for (let k = 0; k < rampData.length; ++k) {
+              rampData[k] = k + 1;
+            }
+
+            // |delay0Frame| is the initial delay in frames. |delay1Frame| is
+            // the new delay in frames.  These must be integers.
+            let delay0Frame = 64;
+            let delay1Frame = 16;
+
+            let src = new AudioBufferSourceNode(context, {buffer: buffer});
+            let delay = new DelayNode(
+                context, {delayTime: delay0Frame / context.sampleRate});
+
+            src.connect(delay).connect(context.destination);
+
+            // After a render quantum, change the delay to |delay1Frame|.
+            context.suspend(RENDER_QUANTUM_FRAMES / context.sampleRate)
+                .then(() => {
+                  delay.delayTime.value = delay1Frame / context.sampleRate;
+                })
+                .then(() => context.resume());
+
+            src.start();
+            context.startRendering()
+                .then(renderedBuffer => {
+                  let renderedData = renderedBuffer.getChannelData(0);
+
+                  // The first |delay0Frame| frames should be zero.
+                  should(
+                      renderedData.slice(0, delay0Frame),
+                      'output[0:' + (delay0Frame - 1) + ']')
+                      .beConstantValueOf(0);
+
+                  // Now we have the ramp should show up from the delay.
+                  let ramp0 =
+                      new Float32Array(RENDER_QUANTUM_FRAMES - delay0Frame);
+                  for (let k = 0; k < ramp0.length; ++k) {
+                    ramp0[k] = rampData[k];
+                  }
+
+                  should(
+                      renderedData.slice(delay0Frame, RENDER_QUANTUM_FRAMES),
+                      'output[' + delay0Frame + ':' +
+                          (RENDER_QUANTUM_FRAMES - 1) + ']')
+                      .beEqualToArray(ramp0);
+
+                  // After one rendering quantum, the delay is changed to
+                  // |delay1Frame|.
+                  let ramp1 =
+                      new Float32Array(context.length - RENDER_QUANTUM_FRAMES);
+                  for (let k = 0; k < ramp1.length; ++k) {
+                    // ramp1[k] = 1 + k + RENDER_QUANTUM_FRAMES - delay1Frame;
+                    ramp1[k] =
+                        rampData[k + RENDER_QUANTUM_FRAMES - delay1Frame];
+                  }
+                  should(
+                      renderedData.slice(RENDER_QUANTUM_FRAMES),
+                      'output[' + RENDER_QUANTUM_FRAMES + ':]')
+                      .beEqualToArray(ramp1);
+                })
+                .then(() => task.done());
+          });
+
+      audit.define(
+          {label: 'test1', description: 'Test value setter and setValueAtTime'},
+          (task, should) => {
+            testWithAutomation(should, {prefix: ''}).then(() => task.done());
+          });
+
+      audit.define(
+          {label: 'test2', description: 'Test value setter and modulation'},
+          (task, should) => {
+            testWithAutomation(should, {
+              prefix: 'With modulation: ',
+              modulator: true
+            }).then(() => task.done());
+          });
+
+      // Compare .value setter with setValueAtTime, Optionally allow modulation
+      // of |delayTime|.
+      function testWithAutomation(should, options) {
+        let prefix = options.prefix;
+        // Channel 0 is the output of delay node using the setter and channel 1
+        // is the output using setValueAtTime.
+        let context = new OfflineAudioContext(2, sampleRate, sampleRate);
+
+        let merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+        merger.connect(context.destination);
+
+        let src = new OscillatorNode(context);
+
+        // |delay0Frame| is the initial delay value in frames. |delay1Frame| is
+        // the new delay in frames. The values here are constrained only by the
+        // constraints for a DelayNode.  These are pretty arbitrary except we
+        // wanted them to be fractional so as not be on a frame boundary to
+        // test interpolation compared with |setValueAtTime()|..
+        let delay0Frame = 3.1;
+        let delay1Frame = 47.2;
+
+        let delayTest = new DelayNode(
+            context, {delayTime: delay0Frame / context.sampleRate});
+        let delayRef = new DelayNode(
+            context, {delayTime: delay0Frame / context.sampleRate});
+
+        src.connect(delayTest).connect(merger, 0, 0);
+        src.connect(delayRef).connect(merger, 0, 1);
+
+        if (options.modulator) {
+          // Fairly arbitrary modulation of the delay time, with a peak
+          // variation of 10 ms.
+          let mod = new OscillatorNode(context, {frequency: 1000});
+          let modGain = new GainNode(context, {gain: .01});
+          mod.connect(modGain);
+          modGain.connect(delayTest.delayTime);
+          modGain.connect(delayRef.delayTime);
+          mod.start();
+        }
+
+        // The time at which the delay time of |delayTest| node will be
+        // changed.  This MUST be on a render quantum boundary, but is
+        // otherwise arbitrary.
+        let changeTime = 3 * RENDER_QUANTUM_FRAMES / context.sampleRate;
+
+        // Schedule the delay change on |delayRef| and also apply the value
+        // setter for |delayTest| at |changeTime|.
+        delayRef.delayTime.setValueAtTime(
+            delay1Frame / context.sampleRate, changeTime);
+        context.suspend(changeTime)
+            .then(() => {
+              delayTest.delayTime.value = delay1Frame / context.sampleRate;
+            })
+            .then(() => context.resume());
+
+        src.start();
+
+        return context.startRendering().then(renderedBuffer => {
+          let actual = renderedBuffer.getChannelData(0);
+          let expected = renderedBuffer.getChannelData(1);
+
+          let match = should(actual, prefix + '.value setter output')
+                          .beEqualToArray(expected);
+          should(
+              match,
+              prefix + '.value setter output matches setValueAtTime output')
+              .beTrue();
+        });
+      }
+
+      audit.run();
+
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html
new file mode 100644
index 00000000000..6c602010d0e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-dynamicscompressornode-interface/dynamicscompressor-basic.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      dynamicscompressor-basic.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+      let context;
+      let compressor;
+
+      audit.define(
+          {
+            label: 'test',
+            description: 'Basic tests for DynamicsCompressorNode API'
+          },
+          function(task, should) {
+
+            context = new AudioContext();
+            compressor = context.createDynamicsCompressor();
+
+            should(compressor.threshold.value, 'compressor.threshold.value')
+                .beEqualTo(-24);
+            should(compressor.knee.value, 'compressor.knee.value')
+                .beEqualTo(30);
+            should(compressor.ratio.value, 'compressor.ratio.value')
+                .beEqualTo(12);
+            should(compressor.attack.value, 'compressor.attack.value')
+                .beEqualTo(Math.fround(0.003));
+            should(compressor.release.value, 'compressor.release.value')
+                .beEqualTo(0.25);
+            should(typeof compressor.reduction, 'typeof compressor.reduction')
+                .beEqualTo('number');
+            should(compressor.reduction, 'compressor.reduction').beEqualTo(0);
+
+            task.done();
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain-basic.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain-basic.html
new file mode 100644
index 00000000000..de2ba11a7f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain-basic.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!--
+Verifies GainNode attributes and their type.
+-->
+<html>
+  <head>
+    <title>
+      gain-basic.html
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define('test', function(task, should) {
+        // Create audio context.
+        let context = new AudioContext();
+
+        // Create gain node.
+        let gainNode = context.createGain();
+
+        should(
+            gainNode.gain instanceof AudioParam,
+            'gainNode.gain instanceof AudioParam')
+            .beTrue();
+
+        task.done();
+      });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain.html
new file mode 100644
index 00000000000..cff609de4b7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/gain.html
@@ -0,0 +1,154 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Basic GainNode Functionality 
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      // Tests that GainNode is properly scaling the gain.  We'll render 11
+      // notes, starting at a gain of 1.0, decreasing in gain by 0.1.  The 11th
+      // note will be of gain 0.0, so it should be silent (at the end in the
+      // rendered output).
+
+      let audit = Audit.createTaskRunner();
+
+      let sampleRate = 44100.0;
+      let bufferDurationSeconds = 0.125;
+      let numberOfNotes = 11;
+      let noteSpacing = bufferDurationSeconds +
+          0.020;  // leave 20ms of silence between each "note"
+      let lengthInSeconds = numberOfNotes * noteSpacing;
+
+      let context = 0;
+      let sinWaveBuffer = 0;
+
+      // Create a stereo AudioBuffer of duration |lengthInSeconds| consisting of
+      // a pure sine wave with the given |frequency|.  Both channels contain the
+      // same data.
+      function createSinWaveBuffer(lengthInSeconds, frequency) {
+        let audioBuffer =
+            context.createBuffer(2, lengthInSeconds * sampleRate, sampleRate);
+
+        let n = audioBuffer.length;
+        let channelL = audioBuffer.getChannelData(0);
+        let channelR = audioBuffer.getChannelData(1);
+
+        for (let i = 0; i < n; ++i) {
+          channelL[i] = Math.sin(frequency * 2.0 * Math.PI * i / sampleRate);
+          channelR[i] = channelL[i];
+        }
+
+        return audioBuffer;
+      }
+
+      function playNote(time, gain, merger) {
+        let source = context.createBufferSource();
+        source.buffer = sinWaveBuffer;
+
+        let gainNode = context.createGain();
+        gainNode.gain.value = gain;
+
+        let sourceSplitter = context.createChannelSplitter(2);
+        let gainSplitter = context.createChannelSplitter(2);
+
+        // Split the stereo channels from the source output and the gain output
+        // and merge them into the desired channels of the merger.
+        source.connect(gainNode).connect(gainSplitter);
+        source.connect(sourceSplitter);
+
+        gainSplitter.connect(merger, 0, 0);
+        gainSplitter.connect(merger, 1, 1);
+        sourceSplitter.connect(merger, 0, 2);
+        sourceSplitter.connect(merger, 1, 3);
+
+        source.start(time);
+      }
+
+      audit.define(
+          {label: 'create context', description: 'Create context for test'},
+          function(task, should) {
+            // Create offline audio context.
+            context = new OfflineAudioContext(
+                4, sampleRate * lengthInSeconds, sampleRate);
+            task.done();
+          });
+
+      audit.define(
+          {label: 'test', description: 'GainNode functionality'},
+          function(task, should) {
+            let merger = new ChannelMergerNode(
+                context, {numberOfInputs: context.destination.channelCount});
+            merger.connect(context.destination);
+
+            // Create a buffer for a short "note".
+            sinWaveBuffer = createSinWaveBuffer(bufferDurationSeconds, 880.0);
+
+            let startTimes = [];
+            let gainValues = [];
+
+            // Render 11 notes, starting at a gain of 1.0, decreasing in gain by
+            // 0.1. The last note will be of gain 0.0, so shouldn't be
+            // perceptible in the rendered output.
+            for (let i = 0; i < numberOfNotes; ++i) {
+              let time = i * noteSpacing;
+              let gain = 1.0 - i / (numberOfNotes - 1);
+              startTimes.push(time);
+              gainValues.push(gain);
+              playNote(time, gain, merger);
+            }
+
+            context.startRendering()
+                .then(buffer => {
+                  let actual0 = buffer.getChannelData(0);
+                  let actual1 = buffer.getChannelData(1);
+                  let reference0 = buffer.getChannelData(2);
+                  let reference1 = buffer.getChannelData(3);
+
+                  // It's ok to a frame too long since the sine pulses are
+                  // followed by silence.
+                  let bufferDurationFrames =
+                      Math.ceil(bufferDurationSeconds * context.sampleRate);
+
+                  // Apply the gains to the reference signal.
+                  for (let k = 0; k < startTimes.length; ++k) {
+                    // It's ok to be a frame early because the sine pulses are
+                    // preceded by silence.
+                    let startFrame =
+                        Math.floor(startTimes[k] * context.sampleRate);
+                    let gain = gainValues[k];
+                    for (let n = 0; n < bufferDurationFrames; ++n) {
+                      reference0[startFrame + n] *= gain;
+                      reference1[startFrame + n] *= gain;
+                    }
+                  }
+
+                  // Verify the channels are clsoe to the reference.
+                  should(actual0, 'Left output from gain node')
+                      .beCloseToArray(
+                          reference0, {relativeThreshold: 1.1908e-7});
+                  should(actual1, 'Right output from gain node')
+                      .beCloseToArray(
+                          reference1, {relativeThreshold: 1.1908e-7});
+
+                  // Test the SNR too for both channels.
+                  let snr0 = 10 * Math.log10(computeSNR(actual0, reference0));
+                  let snr1 = 10 * Math.log10(computeSNR(actual1, reference1));
+                  should(snr0, 'Left SNR (in dB)')
+                      .beGreaterThanOrEqualTo(148.69);
+                  should(snr1, 'Right SNR (in dB)')
+                      .beGreaterThanOrEqualTo(148.69);
+                })
+                .then(() => task.done());
+            ;
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html
new file mode 100644
index 00000000000..6326d00dfb7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html
@@ -0,0 +1,121 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Gain Dezippering Test: Dezippering Removed
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {label: 'test0', description: 'Dezippering of GainNode removed'},
+          (task, should) => {
+            // Only need a few frames to verify that dezippering has been
+            // removed from the GainNode.  Sample rate is pretty arbitrary.
+            let context = new OfflineAudioContext(1, 1024, 16000);
+
+            // Send a unit source to the gain node so we can measure the effect
+            // of the gain node.
+            let src = new ConstantSourceNode(context, {offset: 1});
+            let g = new GainNode(context, {gain: 1});
+            src.connect(g).connect(context.destination);
+
+            context.suspend(RENDER_QUANTUM_FRAMES / context.sampleRate)
+                .then(() => {
+                  g.gain.value = .5;
+                })
+                .then(() => context.resume());
+
+            src.start();
+
+            context.startRendering()
+                .then(audio => {
+                  let c = audio.getChannelData(0);
+
+                  // If dezippering has been removed, the gain output should
+                  // instantly jump at frame 128 to 0.5.
+                  should(c.slice(0, 128), 'output[0:127]').beConstantValueOf(1);
+                  should(c.slice(128), 'output[128:]').beConstantValueOf(0.5);
+                })
+                .then(() => task.done());
+          });
+
+      audit.define(
+          {
+            label: 'test2',
+            description: 'Compare value setter and setValueAtTime'
+          },
+          (task, should) => {
+            testWithAutomation(should, {prefix: ''}).then(() => task.done());
+          });
+
+      audit.define(
+          {label: 'test3', description: 'Automation effects'},
+          (task, should) => {
+            testWithAutomation(should, {
+              prefix: 'With modulation: ',
+              modulator: true
+            }).then(() => task.done());
+          });
+
+      audit.run();
+
+      function testWithAutomation(should, options) {
+        // Sample rate must be a power of two to eliminate round-off in
+        // computing the time at render quantum boundaries.
+        let context = new OfflineAudioContext(2, 1024, 16384);
+        let merger = new ChannelMergerNode(context, {numberOfChannels: 2});
+        merger.connect(context.destination);
+
+        let src = new OscillatorNode(context);
+        let gainTest = new GainNode(context);
+        let gainRef = new GainNode(context);
+
+        src.connect(gainTest).connect(merger, 0, 0);
+        src.connect(gainRef).connect(merger, 0, 1);
+
+        if (options.modulator) {
+          let mod = new OscillatorNode(context, {frequency: 1000});
+          let modGain = new GainNode(context);
+          mod.connect(modGain);
+          modGain.connect(gainTest.gain);
+          modGain.connect(gainRef.gain);
+          mod.start();
+        }
+
+        // Change the gains. Must do the change on a render boundary!
+        let changeTime = 3 * RENDER_QUANTUM_FRAMES / context.sampleRate;
+        let newGain = .3;
+
+        gainRef.gain.setValueAtTime(newGain, changeTime);
+        context.suspend(changeTime)
+            .then(() => gainTest.gain.value = newGain)
+            .then(() => context.resume());
+
+        src.start();
+
+        return context.startRendering().then(audio => {
+          let actual = audio.getChannelData(0);
+          let expected = audio.getChannelData(1);
+
+          // The values using the .value setter must be identical to the
+          // values using setValueAtTime.
+          let match = should(actual, options.prefix + '.value setter output')
+                          .beEqualToArray(expected);
+
+          should(
+              match,
+              options.prefix +
+                  '.value setter output matches setValueAtTime output')
+              .beTrue();
+        });
+      }
+    </script>
+  </body>
+</html>