diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index e3a1ebe61ed..2341518ad75 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -158046,7 +158046,7 @@
      "/css/css-values/vh-support-atviewport.html",
      [
       [
-       "/css/css-values/reference/all-green.html",
+       "/css/css-values/reference/vh-support-atviewport-ref.htm",
        "=="
       ]
      ],
@@ -275214,6 +275214,11 @@
      {}
     ]
    ],
+   "css/css-values/reference/vh-support-atviewport-ref.htm": [
+    [
+     {}
+    ]
+   ],
    "css/css-values/reference/vh_not_refreshing_on_chrome-ref.html": [
     [
      {}
@@ -353391,6 +353396,12 @@
      {}
     ]
    ],
+   "custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html": [
+    [
+     "/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html",
+     {}
+    ]
+   ],
    "custom-elements/historical.html": [
     [
      "/custom-elements/historical.html",
@@ -586988,6 +586999,10 @@
    "962a748d2c059b45fca4d7788b04b77c61e0b923",
    "support"
   ],
+  "css/css-values/reference/vh-support-atviewport-ref.htm": [
+   "cfa9e8d02d48436ee1c311da7c7bd65b0f4291cf",
+   "support"
+  ],
   "css/css-values/reference/vh_not_refreshing_on_chrome-ref.html": [
    "279d1c69b9f7fbe60edb55b7e8a5d507eda24936",
    "support"
@@ -587225,7 +587240,7 @@
    "reftest"
   ],
   "css/css-values/vh-support-atviewport.html": [
-   "c79ace6df18a7432dba34fa83cdb1af183206156",
+   "c1999c4a22e2933259b3f77193c2b20c3b53f199",
    "reftest"
   ],
   "css/css-values/vh-support-margin.html": [
@@ -608036,6 +608051,10 @@
    "7f5a4d0f8e76d495acfdedfe172ef5acfdac75b4",
    "testharness"
   ],
+  "custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html": [
+   "2fd932f29a3bae3e80ee90a1996c1d25ea7934cf",
+   "testharness"
+  ],
   "custom-elements/historical.html": [
    "70981ce59c41dd352bccf1b70a1cb7c8cecf30ec",
    "testharness"
diff --git a/tests/wpt/metadata/css/css-values/vh-support-atviewport.html.ini b/tests/wpt/metadata/css/css-values/vh-support-atviewport.html.ini
new file mode 100644
index 00000000000..9d9d54aebb6
--- /dev/null
+++ b/tests/wpt/metadata/css/css-values/vh-support-atviewport.html.ini
@@ -0,0 +1,2 @@
+[vh-support-atviewport.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html.ini b/tests/wpt/metadata/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html.ini
new file mode 100644
index 00000000000..e2a1761324e
--- /dev/null
+++ b/tests/wpt/metadata/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html.ini
@@ -0,0 +1,7 @@
+[enqueue-custom-element-callback-reactions-inside-another-callback.html]
+  [Connecting an element without connectedCallback while it has a disconnectedCallback in its custom element reaction queue must not result in disconnectedCallback getting invoked before the insertion completes]
+    expected: FAIL
+
+  [Connecting a element with connectedCallback while it has a disconnectedCallback in its custom element reaction queue must result in disconnectedCallback getting invoked before the insertion completes]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index bc427d4a05a..7f1abc15692 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -2,7 +2,7 @@
   type: testharness
 
 [single-byte-decoder.html?document]
-  expected: TIMEOUT
+  expected: CRASH
   [ISO-8859-4: iso_8859-4:1988 (document.characterSet and document.inputEncoding)]
     expected: FAIL
 
@@ -32,7 +32,7 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
-  expected: CRASH
+  expected: TIMEOUT
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     expected: FAIL
 
@@ -141,8 +141,5 @@
   [windows-1254: cp1254 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1253: cp1253 (XMLHttpRequest)]
-    expected: TIMEOUT
-
 
 [single-byte-decoder.html?TextDecoder]
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
deleted file mode 100644
index 75d75b4cda2..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_2.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
deleted file mode 100644
index 385376c7321..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_4.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
index 6f7e41795a2..772148dc71f 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
@@ -11,5 +11,5 @@
     expected: TIMEOUT
 
   [picture: source (max-width:500px) valid image, img valid image, resize to narrow]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
new file mode 100644
index 00000000000..9e522297c94
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
@@ -0,0 +1,7 @@
+[toggleEvent.html]
+  [Calling open twice on 'details' fires only one toggle event]
+    expected: FAIL
+
+  [Setting open=true to opened 'details' element should not fire a toggle event at the 'details' element]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini
deleted file mode 100644
index c6d49957c4a..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[aborted-parser.window.html]
-  [document.open() after parser is aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
new file mode 100644
index 00000000000..63682614c4f
--- /dev/null
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
@@ -0,0 +1,5 @@
+[promise-rejection-events.html]
+  expected: TIMEOUT
+  [rejectionhandled is dispatched from a queued task, and not immediately]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 99a24216c88..7725b118e9d 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -12,3 +12,6 @@
   [Verifies the resolution of entry.startTime is at least 5 microseconds.]
     expected: TIMEOUT
 
+  [Verifies the resolution of performance.now() is at least 5 microseconds.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/resource-timing/buffer-full-store-and-clear-during-callback.html.ini b/tests/wpt/metadata/resource-timing/buffer-full-store-and-clear-during-callback.html.ini
index 88339633554..4f9df99fc13 100644
--- a/tests/wpt/metadata/resource-timing/buffer-full-store-and-clear-during-callback.html.ini
+++ b/tests/wpt/metadata/resource-timing/buffer-full-store-and-clear-during-callback.html.ini
@@ -1,5 +1,5 @@
 [buffer-full-store-and-clear-during-callback.html]
-  expected: TIMEOUT
+  expected: ERROR
   [Test that entries overflowing the buffer trigger the buffer full event, can be stored, and find themselves in the primary buffer after it's cleared.]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
deleted file mode 100644
index dbea4f293ad..00000000000
--- a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[transition_calc_implicit.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/css/css-values/reference/vh-support-atviewport-ref.htm b/tests/wpt/web-platform-tests/css/css-values/reference/vh-support-atviewport-ref.htm
new file mode 100644
index 00000000000..cfa9e8d02d4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-values/reference/vh-support-atviewport-ref.htm
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html><head>
+	<meta charset="utf-8">
+	<title>
+		CSS Reftest Reference
+	</title>
+
+	<link href="mailto:fremycompany.developer@yahoo.fr" rel="author" title="François REMY">
+
+	<style type="text/css">
+			html
+				{
+					background-color: yellow;
+					border-left: blue solid 50vw;
+					height: 100vh;
+				}
+	</style>
+
+</head>
+<body>
+
+</body></html>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/css/css-values/vh-support-atviewport.html b/tests/wpt/web-platform-tests/css/css-values/vh-support-atviewport.html
index c79ace6df18..c1999c4a22e 100644
--- a/tests/wpt/web-platform-tests/css/css-values/vh-support-atviewport.html
+++ b/tests/wpt/web-platform-tests/css/css-values/vh-support-atviewport.html
@@ -1,44 +1,41 @@
 <!DOCTYPE html>
-<html>
-<head>
+<html><head>
 	<meta charset="utf-8">
 	<title>
 		CSS Values and Units Test:
 		Viewports units are supported in @viewport rules
 	</title>
-	<meta name="assert" content="
+	<meta content="
 		Viewports units are supported in @viewport rules
-	" />
+	" name="assert">
 
-	<link
-		rel="author"
-		title="François REMY"
-		href="mailto:fremycompany.developer@yahoo.fr"
-	/>
+	<link href="mailto:fremycompany.developer@yahoo.fr" rel="author" title="François REMY">
 
-	<link rel="help" href="http://www.w3.org/TR/css3-values/#viewport-relative-lengths" />
-	<link rel="help" href="https://drafts.csswg.org/css-device-adapt-1/" />
+	<link href="http://www.w3.org/TR/css3-values/#viewport-relative-lengths" rel="help">
+	<link href="https://drafts.csswg.org/css-device-adapt-1/#atviewport-rule" rel="help">
 
-	<link
-		rel="match"
-		href="reference/all-green.html"
-	/>
+	<link href="reference/vh-support-atviewport-ref.htm" rel="match">
 
 	<style type="text/css">
+			html
+				{
+					background-color: yellow;
+				}
 
-			html, body { margin: 0px; padding: 0px; overflow: hidden; }
-
-			@viewport { width: 1vw; }
-
-			html { background: red; }
-			#target { background: green; width: 100vw; height: 100vh; }
+			body
+				{
+					background-color: blue;
+					height: 100vh;
+					margin: 0;
+				}
 
+			@viewport
+				{
+					width: 50vw;
+				}
 	</style>
 
 </head>
 <body>
 
-	<div id="target"></div>
-
-</body>
-</html>
+</body></html>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html b/tests/wpt/web-platform-tests/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html
new file mode 100644
index 00000000000..2fd932f29a3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/custom-elements/enqueue-custom-element-callback-reactions-inside-another-callback.html
@@ -0,0 +1,223 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Custom Elements: must enqueue an element on the appropriate element queue after checking callback is null and the attribute name</title>
+<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
+<meta name="assert" content="To enqueue a custom element callback reaction, the callback must be checked of being null and whether the attribute name is observed or not">
+<link rel="help" content="https://html.spec.whatwg.org/multipage/custom-elements.html#enqueue-a-custom-element-callback-reaction">
+<link rel="help" content="https://github.com/w3c/webcomponents/issues/760">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/custom-elements-helpers.js"></script>
+</head>
+<body>
+<script>
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            const child = this.firstChild;
+            child.remove();
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        connectedCallback() { logs.push('connected'); }
+        disconnectedCallback() { logs.push('disconnected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'connected', 'disconnected', 'end']);
+}, 'Disconnecting an element with disconnectedCallback while it has a connectedCallback in its custom element reaction queue must result in connectedCallback getting invoked before the removal completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            const child = this.firstChild;
+            child.remove();
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        connectedCallback() { logs.push('connected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'end', 'connected']);
+}, 'Disconnecting an element without disconnectedCallback while it has a connectedCallback in its custom element reaction queue must not result in connectedCallback getting invoked before the removal completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        disconnectedCallback()
+        {
+            logs.push('begin');
+            contentDocument.body.appendChild(this.firstChild);
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        connectedCallback() { logs.push('connected'); }
+        disconnectedCallback() { logs.push('disconnected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    parent.remove();
+    assert_array_equals(logs, ['connected', 'begin', 'disconnected', 'connected', 'end']);
+}, 'Connecting a element with connectedCallback while it has a disconnectedCallback in its custom element reaction queue must result in disconnectedCallback getting invoked before the insertion completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        disconnectedCallback()
+        {
+            logs.push('begin');
+            contentDocument.body.appendChild(this.firstChild);
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        disconnectedCallback() { logs.push('disconnected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    parent.remove();
+    assert_array_equals(logs, ['begin', 'end', 'disconnected']);
+}, 'Connecting an element without connectedCallback while it has a disconnectedCallback in its custom element reaction queue must not result in disconnectedCallback getting invoked before the insertion completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            document.adoptNode(this.firstChild);
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        adoptedCallback() { logs.push('adopted'); }
+        connectedCallback() { logs.push('connected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'connected', 'adopted', 'end']);
+}, 'Adopting an element with adoptingCallback while it has a connectedCallback in its custom element reaction queue must result in connectedCallback getting invoked before the adoption completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            document.adoptNode(this.firstChild);
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        connectedCallback() { logs.push('connected'); }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'end', 'connected']);
+}, 'Adopting an element without adoptingCallback while it has a connectedCallback in its custom element reaction queue must not result in connectedCallback getting invoked before the adoption completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            this.firstChild.setAttribute('title', 'foo');
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        attributeChangedCallback() { logs.push('attributeChanged'); }
+        connectedCallback() { logs.push('connected'); }
+        static get observedAttributes() { return ['title']; }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'connected', 'attributeChanged', 'end']);
+}, 'Setting an observed attribute on an element with attributeChangedCallback while it has a connectedCallback in its custom element reaction queue must result in connectedCallback getting invoked before the attribute change completes');
+
+test_with_window((contentWindow, contentDocument) => {
+    class ParentElement extends contentWindow.HTMLElement {
+        connectedCallback()
+        {
+            logs.push('begin');
+            this.firstChild.setAttribute('lang', 'en');
+            logs.push('end');
+        }
+    }
+    contentWindow.customElements.define('parent-element', ParentElement);
+
+    const logs = [];
+    class ChildElement extends contentWindow.HTMLElement {
+        attributeChangedCallback() { logs.push('attributeChanged'); }
+        connectedCallback() { logs.push('connected'); }
+        static get observedAttributes() { return ['title']; }
+    }
+    contentWindow.customElements.define('child-element', ChildElement);
+
+    const parent = new ParentElement;
+    const child = new ChildElement;
+    parent.appendChild(child);
+    contentDocument.body.appendChild(parent);
+    assert_array_equals(logs, ['begin', 'end', 'connected']);
+}, 'Setting an observed attribute on an element with attributeChangedCallback while it has a connectedCallback in its custom element reaction queue must not result in connectedCallback getting invoked before the attribute change completes');
+
+</script>
+</body>
+</html>