Merge branch 'master' of https://github.com/MoonchildProductions/UXP into form-disabled-issue

22 files changed, 115 insertions, 371 deletions

diff --git a/testing/web-platform/harness/wptrunner/browsers/firefox.py b/testing/web-platform/harness/wptrunner/browsers/firefox.py
index 183820c5c..c03dd0eda 100644
--- a/testing/web-platform/harness/wptrunner/browsers/firefox.py
+++ b/testing/web-platform/harness/wptrunner/browsers/firefox.py
@@ -142,11 +142,6 @@ class FirefoxBrowser(Browser):
         if self.e10s:
             self.profile.set_preferences({"browser.tabs.remote.autostart": True})
 
-        # Bug 1262954: winxp + e10s, disable hwaccel
-        if (self.e10s and platform.system() in ("Windows", "Microsoft") and
-            '5.1' in platform.version()):
-            self.profile.set_preferences({"layers.acceleration.disabled": True})
-
         if self.ca_certificate_path is not None:
             self.setup_ssl()
 
diff --git a/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini b/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini
index 9e2bf7385..3f9f66d17 100644
--- a/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini
+++ b/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini
@@ -1,29 +1,11 @@
 [CustomElementRegistry.html]
   type: testharness
-  [customElements.define must throw a NotSupportedError when there is already a custom element with the same class]
-    expected: FAIL
-
   [customElements.define must get callbacks of the constructor prototype]
     expected: FAIL
 
   [customElements.define must get "observedAttributes" property on the constructor prototype when "attributeChangedCallback" is present]
     expected: FAIL
 
-  [customElements.define must rethrow an exception thrown while getting observedAttributes on the constructor prototype]
-    expected: FAIL
-
-  [customElements.define must rethrow an exception thrown while converting the value of observedAttributes to sequence<DOMString>]
-    expected: FAIL
-
-  [customElements.define must rethrow an exception thrown while iterating over observedAttributes to sequence<DOMString>]
-    expected: FAIL
-
-  [customElements.define must rethrow an exception thrown while retrieving Symbol.iterator on observedAttributes]
-    expected: FAIL
-
-  [customElements.define must define an instantiatable custom element]
-    expected: FAIL
-
   [customElements.define must upgrade elements in the shadow-including tree order]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/custom-elements/adopted-callback.html.ini b/testing/web-platform/meta/custom-elements/adopted-callback.html.ini
index fdd258bd6..e35f704ac 100644
--- a/testing/web-platform/meta/custom-elements/adopted-callback.html.ini
+++ b/testing/web-platform/meta/custom-elements/adopted-callback.html.ini
@@ -1,20 +1,5 @@
 [adopted-callback.html]
   type: testharness
-  [Inserting a custom element into the owner document must not enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting a custom element into the document of the template elements must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into the document of the template elements must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into the document of the template elements must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into the document of the template elements must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in the document of the template elements must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -27,18 +12,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to the document of the template elements must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a new document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into a new document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a new document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into a new document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a new document must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -51,18 +24,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a new document must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a cloned document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into a cloned document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a cloned document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into a cloned document must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a cloned document must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -75,18 +36,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a cloned document must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -99,18 +48,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into an HTML document created by createDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into an HTML document created by createDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into an HTML document created by createDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into an HTML document created by createDocument must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in an HTML document created by createDocument must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -123,18 +60,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to an HTML document created by createDocument must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into the document of an iframe must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into the document of an iframe must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into the document of an iframe must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into the document of an iframe must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in the document of an iframe must enqueue and invoke adoptedCallback]
     expected: FAIL
 
@@ -147,18 +72,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to the document of an iframe must enqueue and invoke adoptedCallback]
     expected: FAIL
 
-  [Inserting a custom element into an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving a custom element from the owner document into an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
-  [Moving an ancestor of custom element from the owner document into an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/custom-elements/attribute-changed-callback.html.ini b/testing/web-platform/meta/custom-elements/attribute-changed-callback.html.ini
index 10eea70b2..1b1bea6c9 100644
--- a/testing/web-platform/meta/custom-elements/attribute-changed-callback.html.ini
+++ b/testing/web-platform/meta/custom-elements/attribute-changed-callback.html.ini
@@ -12,21 +12,5 @@
   [setAttributeNode and removeAttributeNS must enqueue and invoke attributeChangedCallback for an SVG attribute]
     expected: FAIL
 
-  [Mutating attributeChangedCallback after calling customElements.define must not affect the callback being invoked]
-    expected: FAIL
-
-  [attributedChangedCallback must not be invoked when the observed attributes does not contain the attribute]
-    expected: FAIL
-
-  [Mutating observedAttributes after calling customElements.define must not affect the set of attributes for which attributedChangedCallback is invoked]
-    expected: FAIL
-
-  [attributedChangedCallback must be enqueued for attributes specified in a non-Array iterable observedAttributes]
-    expected: FAIL
-
   [attributedChangedCallback must be enqueued for style attribute change by mutating inline style declaration]
     expected: FAIL
-
-  [attributedChangedCallback must not be enqueued when mutating inline style declaration if the style attribute is not observed]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/connected-callbacks.html.ini b/testing/web-platform/meta/custom-elements/connected-callbacks.html.ini
index d57ab6bdb..c8a99d695 100644
--- a/testing/web-platform/meta/custom-elements/connected-callbacks.html.ini
+++ b/testing/web-platform/meta/custom-elements/connected-callbacks.html.ini
@@ -1,11 +1,5 @@
 [connected-callbacks.html]
   type: testharness
-  [Inserting a custom element into the document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into the document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in the document must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -15,12 +9,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to the document must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into the document of the template elements must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into the document of the template elements must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in the document of the template elements must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -30,12 +18,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to the document of the template elements must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a new document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a new document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a new document must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -45,12 +27,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a new document must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a cloned document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a cloned document must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a cloned document must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -60,12 +36,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a cloned document must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into a document created by createHTMLDocument must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into a document created by createHTMLDocument must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in a document created by createHTMLDocument must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -75,12 +45,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to a document created by createHTMLDocument must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into an HTML document created by createDocument must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into an HTML document created by createDocument must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in an HTML document created by createDocument must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -90,12 +54,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to an HTML document created by createDocument must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into the document of an iframe must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into the document of an iframe must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in the document of an iframe must enqueue and invoke connectedCallback]
     expected: FAIL
 
@@ -105,12 +63,6 @@
   [Inserting a custom element into a detached shadow tree that belongs to the document of an iframe must not enqueue and invoke connectedCallback]
     expected: FAIL
 
-  [Inserting a custom element into an HTML document fetched by XHR must enqueue and invoke connectedCallback]
-    expected: FAIL
-
-  [Inserting an ancestor of custom element into an HTML document fetched by XHR must enqueue and invoke connectedCallback]
-    expected: FAIL
-
   [Inserting a custom element into a shadow tree in an HTML document fetched by XHR must enqueue and invoke connectedCallback]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/custom-elements/custom-element-registry/define.html.ini b/testing/web-platform/meta/custom-elements/custom-element-registry/define.html.ini
deleted file mode 100644
index 122abccd3..000000000
--- a/testing/web-platform/meta/custom-elements/custom-element-registry/define.html.ini
+++ /dev/null
@@ -1,26 +0,0 @@
-[define.html]
-  type: testharness
-  [If constructor is HTMLElement, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is HTMLButtonElement, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is HTMLImageElement, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is HTMLMediaElement, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is Image, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is Audio, should throw a TypeError]
-    expected: FAIL
-
-  [If constructor is Option, should throw a TypeError]
-    expected: FAIL
-
-  [If the constructor is already defined, should throw a NotSupportedError]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/disconnected-callbacks.html.ini b/testing/web-platform/meta/custom-elements/disconnected-callbacks.html.ini
index 631dc8b5d..03c6f9937 100644
--- a/testing/web-platform/meta/custom-elements/disconnected-callbacks.html.ini
+++ b/testing/web-platform/meta/custom-elements/disconnected-callbacks.html.ini
@@ -1,11 +1,5 @@
 [disconnected-callbacks.html]
   type: testharness
-  [Removing a custom element from the document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from the document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in the document must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -15,12 +9,6 @@
   [Removing a custom element from a detached shadow tree that belongs to the document must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from the document of the template elements must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from the document of the template elements must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in the document of the template elements must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -30,12 +18,6 @@
   [Removing a custom element from a detached shadow tree that belongs to the document of the template elements must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from a new document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from a new document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in a new document must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -45,12 +27,6 @@
   [Removing a custom element from a detached shadow tree that belongs to a new document must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from a cloned document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from a cloned document must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in a cloned document must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -60,12 +36,6 @@
   [Removing a custom element from a detached shadow tree that belongs to a cloned document must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from a document created by createHTMLDocument must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from a document created by createHTMLDocument must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in a document created by createHTMLDocument must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -75,12 +45,6 @@
   [Removing a custom element from a detached shadow tree that belongs to a document created by createHTMLDocument must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from an HTML document created by createDocument must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from an HTML document created by createDocument must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in an HTML document created by createDocument must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -90,12 +54,6 @@
   [Removing a custom element from a detached shadow tree that belongs to an HTML document created by createDocument must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from the document of an iframe must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from the document of an iframe must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in the document of an iframe must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
@@ -105,12 +63,6 @@
   [Removing a custom element from a detached shadow tree that belongs to the document of an iframe must not enqueue and invoke disconnectedCallback]
     expected: FAIL
 
-  [Removing a custom element from an HTML document fetched by XHR must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
-  [Removing an ancestor of custom element from an HTML document fetched by XHR must enqueue and invoke disconnectedCallback]
-    expected: FAIL
-
   [Removing a custom element from a shadow tree in an HTML document fetched by XHR must enqueue and invoke disconnectedCallback]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/custom-elements/reaction-timing.html.ini b/testing/web-platform/meta/custom-elements/reaction-timing.html.ini
deleted file mode 100644
index 0697f7014..000000000
--- a/testing/web-platform/meta/custom-elements/reaction-timing.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[reaction-timing.html]
-  type: testharness
-  [Calling Node.prototype.cloneNode(false) must push a new element queue to the processing stack]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/reactions/ChildNode.html.ini b/testing/web-platform/meta/custom-elements/reactions/ChildNode.html.ini
deleted file mode 100644
index 4265435e3..000000000
--- a/testing/web-platform/meta/custom-elements/reactions/ChildNode.html.ini
+++ /dev/null
@@ -1,23 +0,0 @@
-[ChildNode.html]
-  type: testharness
-  [before on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [before on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [after on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [after on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [replaceWith on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [replaceWith on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [replaceWith on ChildNode must enqueue a disconnected reaction]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/reactions/Document.html.ini b/testing/web-platform/meta/custom-elements/reactions/Document.html.ini
index 71f9e29a4..0c42955de 100644
--- a/testing/web-platform/meta/custom-elements/reactions/Document.html.ini
+++ b/testing/web-platform/meta/custom-elements/reactions/Document.html.ini
@@ -2,7 +2,3 @@
   type: testharness
   [importNode on Document must construct a new custom element when importing a custom element]
     expected: FAIL
-
-  [adoptNode on Document must enqueue an adopted reaction when importing a custom element]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/reactions/Node.html.ini b/testing/web-platform/meta/custom-elements/reactions/Node.html.ini
deleted file mode 100644
index 87acc9aa6..000000000
--- a/testing/web-platform/meta/custom-elements/reactions/Node.html.ini
+++ /dev/null
@@ -1,44 +0,0 @@
-[Node.html]
-  type: testharness
-  [nodeValue on Node must enqueue an attributeChanged reaction when replacing an existing attribute]
-    expected: FAIL
-
-  [nodeValue on Node must not enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
-    expected: FAIL
-
-  [textContent on Node must enqueue an attributeChanged reaction when replacing an existing attribute]
-    expected: FAIL
-
-  [textContent on Node must not enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
-    expected: FAIL
-
-  [cloneNode on Node must enqueue an attributeChanged reaction when cloning an element with an observed attribute]
-    expected: FAIL
-
-  [cloneNode on Node must not enqueue an attributeChanged reaction when cloning an element with an unobserved attribute]
-    expected: FAIL
-
-  [cloneNode on Node must enqueue an attributeChanged reaction when cloning an element only for observed attributes]
-    expected: FAIL
-
-  [insertBefore on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [insertBefore on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [appendChild on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [appendChild on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [replaceChild on ChildNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [replaceChild on ChildNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [removeChild on ChildNode must enqueue a disconnected reaction]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/reactions/ParentNode.html.ini b/testing/web-platform/meta/custom-elements/reactions/ParentNode.html.ini
deleted file mode 100644
index ccdf5de7c..000000000
--- a/testing/web-platform/meta/custom-elements/reactions/ParentNode.html.ini
+++ /dev/null
@@ -1,14 +0,0 @@
-[ParentNode.html]
-  type: testharness
-  [prepend on ParentNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [prepend on ParentNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
-  [append on ParentNode must enqueue a connected reaction]
-    expected: FAIL
-
-  [append on ParentNode must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/custom-elements/reactions/Range.html.ini b/testing/web-platform/meta/custom-elements/reactions/Range.html.ini
deleted file mode 100644
index 4ca3fcde7..000000000
--- a/testing/web-platform/meta/custom-elements/reactions/Range.html.ini
+++ /dev/null
@@ -1,23 +0,0 @@
-[Range.html]
-  type: testharness
-  [deleteContents on Range must enqueue a disconnected reaction]
-    expected: FAIL
-
-  [extractContents on Range must enqueue a disconnected reaction]
-    expected: FAIL
-
-  [cloneContents on Range must enqueue an attributeChanged reaction when cloning an element with an observed attribute]
-    expected: FAIL
-
-  [cloneContents on Range must not enqueue an attributeChanged reaction when cloning an element with an unobserved attribute]
-    expected: FAIL
-
-  [cloneContents on Range must enqueue an attributeChanged reaction when cloning an element only for observed attributes]
-    expected: FAIL
-
-  [insertNode on Range must enqueue a connected reaction]
-    expected: FAIL
-
-  [insertNode on Range must enqueue a disconnected reaction, an adopted reaction, and a connected reaction when the custom element was in another document]
-    expected: FAIL
-
diff --git a/testing/web-platform/meta/html/dom/interfaces.html.ini b/testing/web-platform/meta/html/dom/interfaces.html.ini
index 16a03337e..db6a464d0 100644
--- a/testing/web-platform/meta/html/dom/interfaces.html.ini
+++ b/testing/web-platform/meta/html/dom/interfaces.html.ini
@@ -1,6 +1,6 @@
 [interfaces.html]
   type: testharness
-  prefs: [dom.forms.inputmode:true, dom.details_element.enabled:true, dom.dialog_element.enabled:true]
+  prefs: [dom.forms.inputmode:true, dom.dialog_element.enabled:true]
   [Document interface: attribute domain]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/html/dom/reflection-misc.html.ini b/testing/web-platform/meta/html/dom/reflection-misc.html.ini
index b0909cc6d..bc65d4191 100644
--- a/testing/web-platform/meta/html/dom/reflection-misc.html.ini
+++ b/testing/web-platform/meta/html/dom/reflection-misc.html.ini
@@ -1,6 +1,6 @@
 [reflection-misc.html]
   type: testharness
-  prefs: [dom.details_element.enabled: true, dom.dialog_element.enabled: true]
+  prefs: [dom.dialog_element.enabled: true]
   [html.tabIndex: setAttribute() to object "3" followed by getAttribute()]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/details.html.ini b/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/details.html.ini
deleted file mode 100644
index 6ffca742c..000000000
--- a/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/details.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[details.html]
-  type: testharness
-  prefs: [dom.details_element.enabled:true]
diff --git a/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
deleted file mode 100644
index 335ffd5b3..000000000
--- a/testing/web-platform/meta/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[toggleEvent.html]
-  type: testharness
-  prefs: [dom.details_element.enabled:true]
diff --git a/testing/web-platform/meta/html/semantics/interfaces.html.ini b/testing/web-platform/meta/html/semantics/interfaces.html.ini
index 23f55fbe4..f191cad52 100644
--- a/testing/web-platform/meta/html/semantics/interfaces.html.ini
+++ b/testing/web-platform/meta/html/semantics/interfaces.html.ini
@@ -1,6 +1,6 @@
 [interfaces.html]
   type: testharness
-  prefs: [dom.details_element.enabled: true, dom.dialog_element.enabled: true]
+  prefs: [dom.dialog_element.enabled: true]
   [Interfaces for image]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/svg/interfaces.html.ini b/testing/web-platform/meta/svg/interfaces.html.ini
index 292ca6b74..410f20f69 100644
--- a/testing/web-platform/meta/svg/interfaces.html.ini
+++ b/testing/web-platform/meta/svg/interfaces.html.ini
@@ -1,6 +1,5 @@
 [interfaces.html]
   type: testharness
-  prefs: [dom.details_element.enabled:true]
   [SVGGeometryElement interface: existence and properties of interface object]
     expected: FAIL
 
diff --git a/testing/web-platform/tests/custom-elements/attribute-changed-callback.html b/testing/web-platform/tests/custom-elements/attribute-changed-callback.html
index bd467912b..5090bfbfb 100644
--- a/testing/web-platform/tests/custom-elements/attribute-changed-callback.html
+++ b/testing/web-platform/tests/custom-elements/attribute-changed-callback.html
@@ -11,6 +11,7 @@
 </head>
 <body>
 <div id="log"></div>
+<parser-created-element title></parser-created-element>
 <script>
 
 var customElement = define_new_custom_element(['title', 'id', 'r']);
@@ -218,6 +219,36 @@ test(function () {
     assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: 'hello', namespace: null});
 }, 'attributedChangedCallback must not be enqueued when mutating inline style declaration if the style attribute is not observed');
 
+test(function () {
+    var calls = [];
+    class CustomElement extends HTMLElement { }
+    CustomElement.prototype.attributeChangedCallback = function (...args) {
+        calls.push(create_attribute_changed_callback_log(this, ...args));
+    }
+    CustomElement.observedAttributes = ['title'];
+    customElements.define('parser-created-element', CustomElement);
+    assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
+}, 'Upgrading a parser created element must enqueue and invoke attributeChangedCallback for an HTML attribute');
+
+test(function () {
+    var calls = [];
+    class CustomElement extends HTMLElement { }
+    CustomElement.prototype.attributeChangedCallback = function (...args) {
+        calls.push(create_attribute_changed_callback_log(this, ...args));
+    }
+    CustomElement.observedAttributes = ['title'];
+    customElements.define('cloned-element-with-attribute', CustomElement);
+
+    var instance = document.createElement('cloned-element-with-attribute');
+    assert_equals(calls.length, 0);
+    instance.title = '';
+    assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
+
+    calls = [];
+    var clone = instance.cloneNode(false);
+    assert_attribute_log_entry(calls[0], {name: 'title', oldValue: null, newValue: '', namespace: null});
+}, 'Upgrading a cloned element must enqueue and invoke attributeChangedCallback for an HTML attribute');
+
 </script>
 </body>
 </html>
diff --git a/testing/web-platform/tests/custom-elements/reactions/with-exceptions.html b/testing/web-platform/tests/custom-elements/reactions/with-exceptions.html
new file mode 100644
index 000000000..82e0f59c9
--- /dev/null
+++ b/testing/web-platform/tests/custom-elements/reactions/with-exceptions.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Custom Elements: CEReactions interaction with exceptions</title>
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<meta name="help" content="https://html.spec.whatwg.org/multipage/#cereactions">
+<meta name="help" content="https://github.com/whatwg/html/pull/3235">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/custom-elements-helpers.js"></script>
+
+<div id="log"></div>
+
+<script>
+"use strict";
+// Basically from https://github.com/whatwg/html/issues/3217#issuecomment-343633273
+test_with_window((contentWindow, contentDocument) => {
+  let reactionRan = false;
+  contentWindow.customElements.define("custom-element", class extends contentWindow.HTMLElement {
+    disconnectedCallback() {
+      reactionRan = true;
+    }
+  });
+  const text = contentDocument.createTextNode("");
+  contentDocument.documentElement.appendChild(text);
+  const element = contentDocument.createElement("custom-element");
+  contentDocument.documentElement.appendChild(element);
+  assert_throws("HierarchyRequestError", () => text.before("", contentDocument.documentElement));
+  assert_true(reactionRan);
+}, "Reaction must run even after the exception is thrown");
+</script>
diff --git a/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/Document.body.html b/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/Document.body.html
index 07f1edf93..7d8548885 100644
--- a/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/Document.body.html
+++ b/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/Document.body.html
@@ -166,4 +166,54 @@ test(function() {
   doc.body = new_frameset;
   assert_equals(doc.body, new_frameset, "test6-3, append frameset to a new document");
 }, "Setting document.body to a new frameset element.");
+
+test(function() {
+  var doc = createDocument();
+  var html = doc.appendChild(doc.createElement("html"));
+  var f =
+    html.appendChild(doc.createElement("frameset"));
+  assert_equals(doc.body, f);
+
+  var b = doc.createElement("body");
+  doc.body = b;
+
+  assert_equals(f.parentNode, null,
+                "Frameset should have been removed from the tree");
+  assert_equals(doc.body, b, "Body should be the new doc.body");
+}, "Setting document.body to a body will replace an existing frameset if there is one.");
+
+test(function() {
+  var doc = createDocument();
+  var html = doc.appendChild(doc.createElement("html"));
+  var b =
+    html.appendChild(doc.createElement("body"));
+  assert_equals(doc.body, b);
+
+  var f = doc.createElement("frameset");
+  doc.body = f;
+
+  assert_equals(b.parentNode, null,
+                "Body should have been removed from the tree");
+  assert_equals(doc.body, f, "Frameset should be the new doc.body");
+}, "Setting document.body to a frameset will replace an existing body if there is one.");
+
+test(function() {
+  var doc = createDocument();
+  var html = doc.appendChild(doc.createElement("html"));
+  var b =
+    html.appendChild(doc.createElement("body"));
+  var f1 = html.appendChild(doc.createElement("frameset"));
+  assert_equals(doc.body, b);
+
+  var f2 = doc.createElement("frameset");
+  doc.body = f2;
+
+  assert_equals(b.parentNode, null,
+                "Body should have been removed from the tree");
+  assert_equals(f1.parentNode, html,
+                "Frameset following body should still be in the tree.");
+  assert_equals(doc.body, f2, "New frameset should be the new doc.body");
+  assert_equals(f2.nextSibling, f1, "New frameset should have replaced the body");
+}, "Setting document.body to a frameset will replace the first existing body/frameset.");
+
 </script>