Add m-esr52 at 52.6.0

19 files changed, 874 insertions, 0 deletions

diff --git a/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini b/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini
new file mode 100644
index 000000000..9e2bf7385
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini
@@ -0,0 +1,29 @@
+[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/HTMLElement-constructor.html.ini b/testing/web-platform/meta/custom-elements/HTMLElement-constructor.html.ini
new file mode 100644
index 000000000..0d2d4374f
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/HTMLElement-constructor.html.ini
@@ -0,0 +1,11 @@
+[HTMLElement-constructor.html]
+  type: testharness
+  [HTMLElement constructor must infer the tag name from the element interface]
+    expected: FAIL
+
+  [HTMLElement constructor must allow subclassing a custom element]
+    expected: FAIL
+
+  [HTMLElement constructor must allow subclassing an user-defined subclass of HTMLElement]
+    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
new file mode 100644
index 000000000..fdd258bd6
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/adopted-callback.html.ini
@@ -0,0 +1,173 @@
+[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
+
+  [Inserting the shadow host of a custom element into the document of the template elements must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a 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 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
+
+  [Inserting the shadow host of a custom element into a new document must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a custom element from the owner document into a new document must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into a cloned document must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a custom element from the owner document into a cloned document must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into a document created by createHTMLDocument must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a 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 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
+
+  [Inserting the shadow host of a custom element into an HTML document created by createDocument must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a 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 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
+
+  [Inserting the shadow host of a custom element into the document of an iframe must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a 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 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
+
+  [Inserting the shadow host of a custom element into an HTML document fetched by XHR must enqueue and invoke adoptedCallback]
+    expected: FAIL
+
+  [Moving the shadow host of a 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 detached shadow tree that belongs to 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
new file mode 100644
index 000000000..10eea70b2
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/attribute-changed-callback.html.ini
@@ -0,0 +1,32 @@
+[attribute-changed-callback.html]
+  type: testharness
+  [setAttribute and removeAttribute must enqueue and invoke attributeChangedCallback]
+    expected: FAIL
+
+  [setAttributeNS and removeAttributeNS must enqueue and invoke attributeChangedCallback]
+    expected: FAIL
+
+  [setAttributeNode and removeAttributeNode must enqueue and invoke attributeChangedCallback for an HTML attribute]
+    expected: FAIL
+
+  [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
new file mode 100644
index 000000000..d57ab6bdb
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/connected-callbacks.html.ini
@@ -0,0 +1,122 @@
+[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
+
+  [Inserting the shadow host of a custom element into the document must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into the document of the template elements must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into a new document must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into a cloned document must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into a document created by createHTMLDocument must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into an HTML document created by createDocument must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into the document of an iframe must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Inserting the shadow host of a custom element into an HTML document fetched by XHR must enqueue and invoke connectedCallback]
+    expected: FAIL
+
+  [Inserting a custom element into a detached shadow tree that belongs to an HTML document fetched by XHR must not 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
new file mode 100644
index 000000000..122abccd3
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/custom-element-registry/define.html.ini
@@ -0,0 +1,26 @@
+[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
new file mode 100644
index 000000000..631dc8b5d
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/disconnected-callbacks.html.ini
@@ -0,0 +1,122 @@
+[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
+
+  [Removing the shadow host of a custom element from athe document must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from athe document of the template elements must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from aa new document must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from aa cloned document must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from aa document created by createHTMLDocument must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from aan HTML document created by createDocument must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from athe document of an iframe must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [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
+
+  [Removing the shadow host of a custom element from aan HTML document fetched by XHR must enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
+  [Removing a custom element from a detached shadow tree that belongs to an HTML document fetched by XHR must not enqueue and invoke disconnectedCallback]
+    expected: FAIL
+
diff --git a/testing/web-platform/meta/custom-elements/htmlconstructor/newtarget.html.ini b/testing/web-platform/meta/custom-elements/htmlconstructor/newtarget.html.ini
new file mode 100644
index 000000000..f77a64e1d
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/htmlconstructor/newtarget.html.ini
@@ -0,0 +1,14 @@
+[newtarget.html]
+  type: testharness
+  [Use NewTarget's prototype, not the one stored at definition time]
+    expected: FAIL
+
+  [Rethrow any exceptions thrown while getting the prototype]
+    expected: FAIL
+
+  [If prototype is not object, derives the fallback from NewTarget's realm (autonomous custom elements)]
+    expected: FAIL
+
+  [If prototype is not object, derives the fallback from NewTarget's realm (customized built-in elements)]
+    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
new file mode 100644
index 000000000..0697f7014
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reaction-timing.html.ini
@@ -0,0 +1,5 @@
+[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/Attr.html.ini b/testing/web-platform/meta/custom-elements/reactions/Attr.html.ini
new file mode 100644
index 000000000..5a3ddc4ec
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/Attr.html.ini
@@ -0,0 +1,8 @@
+[Attr.html]
+  type: testharness
+  [value on Attr must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [value on Attr must not enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    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
new file mode 100644
index 000000000..4265435e3
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/ChildNode.html.ini
@@ -0,0 +1,23 @@
+[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/DOMTokenList.html.ini b/testing/web-platform/meta/custom-elements/reactions/DOMTokenList.html.ini
new file mode 100644
index 000000000..55b32ed3a
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/DOMTokenList.html.ini
@@ -0,0 +1,59 @@
+[DOMTokenList.html]
+  type: testharness
+  [add on DOMTokenList must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [add on DOMTokenList must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [add on DOMTokenList must enqueue an attributeChanged reaction when adding a value to an existing attribute]
+    expected: FAIL
+
+  [add on DOMTokenList must not enqueue an attributeChanged reaction when adding a value to an unobserved attribute]
+    expected: FAIL
+
+  [add on DOMTokenList must enqueue exactly one attributeChanged reaction when adding multiple values to an attribute]
+    expected: FAIL
+
+  [remove on DOMTokenList must enqueue an attributeChanged reaction when removing a value from an attribute]
+    expected: FAIL
+
+  [remove on DOMTokenList must enqueue exactly one attributeChanged reaction when removing multiple values to an attribute]
+    expected: FAIL
+
+  [remove on DOMTokenList must not enqueue an attributeChanged reaction when removing a non-existent value from an attribute]
+    expected: FAIL
+
+  [remove on DOMTokenList must not enqueue an attributeChanged reaction when removing a value from an unobserved attribute]
+    expected: FAIL
+
+  [toggle on DOMTokenList must enqueue an attributeChanged reaction when adding a value to an attribute]
+    expected: FAIL
+
+  [toggle on DOMTokenList must enqueue an attributeChanged reaction when removing a value from an attribute]
+    expected: FAIL
+
+  [replace on DOMTokenList must enqueue an attributeChanged reaction when replacing a value in an attribute]
+    expected: FAIL
+
+  [replace on DOMTokenList must not enqueue an attributeChanged reaction when the token to replace does not exist in the attribute]
+    expected: FAIL
+
+  [replace on DOMTokenList must not enqueue an attributeChanged reaction when replacing a value in an unobserved attribute]
+    expected: FAIL
+
+  [the stringifier of DOMTokenList must enqueue an attributeChanged reaction when adding an observed attribute]
+    expected: FAIL
+
+  [the stringifier of DOMTokenList must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [the stringifier of DOMTokenList must enqueue an attributeChanged reaction when mutating the value of an observed attribute]
+    expected: FAIL
+
+  [the stringifier of DOMTokenList must not enqueue an attributeChanged reaction when mutating the value of an unobserved attribute]
+    expected: FAIL
+
+  [the stringifier of DOMTokenList must enqueue an attributeChanged reaction when the setter is called with the original value of the attribute]
+    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
new file mode 100644
index 000000000..71f9e29a4
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/Document.html.ini
@@ -0,0 +1,8 @@
+[Document.html]
+  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/Element.html.ini b/testing/web-platform/meta/custom-elements/reactions/Element.html.ini
new file mode 100644
index 000000000..d4049a4b0
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/Element.html.ini
@@ -0,0 +1,110 @@
+[Element.html]
+  type: testharness
+  [id on Element must enqueue an attributeChanged reaction when adding id content attribute]
+    expected: FAIL
+
+  [id on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [className on Element must enqueue an attributeChanged reaction when adding class content attribute]
+    expected: FAIL
+
+  [className on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [slot on Element must enqueue an attributeChanged reaction when adding slot content attribute]
+    expected: FAIL
+
+  [slot on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setAttribute on Element must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setAttribute on Element must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setAttribute on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setAttribute on Element must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNS on Element must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setAttributeNS on Element must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNS on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setAttributeNS on Element must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [removeAttribute on Element must not enqueue an attributeChanged reaction when removing an attribute that does not exist]
+    expected: FAIL
+
+  [removeAttribute on Element must not enqueue an attributeChanged reaction when removing an unobserved attribute]
+    expected: FAIL
+
+  [removeAttribute on Element must enqueue an attributeChanged reaction when removing an existing attribute]
+    expected: FAIL
+
+  [removeAttribute on Element must not enqueue an attributeChanged reaction when removing an existing unobserved attribute]
+    expected: FAIL
+
+  [removeAttributeNS on Element must not enqueue an attributeChanged reaction when removing an attribute that does not exist]
+    expected: FAIL
+
+  [removeAttributeNS on Element must not enqueue an attributeChanged reaction when removing an unobserved attribute]
+    expected: FAIL
+
+  [removeAttributeNS on Element must enqueue an attributeChanged reaction when removing an existing attribute]
+    expected: FAIL
+
+  [removeAttributeNS on Element must not enqueue an attributeChanged reaction when removing an existing unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNode on Element must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setAttributeNode on Element must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNode on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setAttributeNode on Element must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNodeNS on Element must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setAttributeNodeNS on Element must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setAttributeNodeNS on Element must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setAttributeNodeNS on Element must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [removeAttributeNode on Element must not enqueue an attributeChanged reaction when removing an attribute that does not exist]
+    expected: FAIL
+
+  [removeAttributeNode on Element must not enqueue an attributeChanged reaction when removing an unobserved attribute]
+    expected: FAIL
+
+  [removeAttributeNode on Element must enqueue an attributeChanged reaction when removing an existing attribute]
+    expected: FAIL
+
+  [removeAttributeNode on Element must not enqueue an attributeChanged reaction when removing an existing unobserved attribute]
+    expected: FAIL
+
+  [undefined must enqueue a connected reaction]
+    expected: FAIL
+
+  [undefined 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/NamedNodeMap.html.ini b/testing/web-platform/meta/custom-elements/reactions/NamedNodeMap.html.ini
new file mode 100644
index 000000000..0b11439cf
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/NamedNodeMap.html.ini
@@ -0,0 +1,50 @@
+[NamedNodeMap.html]
+  type: testharness
+  [setNamedItem on NamedNodeMap must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setNamedItem on NamedNodeMap must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setNamedItem on NamedNodeMap must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setNamedItem on NamedNodeMap must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [setNamedItemNS on NamedNodeMap must enqueue an attributeChanged reaction when adding an attribute]
+    expected: FAIL
+
+  [setNamedItemNS on NamedNodeMap must not enqueue an attributeChanged reaction when adding an unobserved attribute]
+    expected: FAIL
+
+  [setNamedItemNS on NamedNodeMap must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
+  [setNamedItemNS on NamedNodeMap must enqueue an attributeChanged reaction when replacing an existing unobserved attribute]
+    expected: FAIL
+
+  [removeNamedItem on NamedNodeMap must not enqueue an attributeChanged reaction when removing an attribute that does not exist]
+    expected: FAIL
+
+  [removeNamedItem on NamedNodeMap must not enqueue an attributeChanged reaction when removing an unobserved attribute]
+    expected: FAIL
+
+  [removeNamedItem on NamedNodeMap must enqueue an attributeChanged reaction when removing an existing attribute]
+    expected: FAIL
+
+  [removeNamedItem on NamedNodeMap must not enqueue an attributeChanged reaction when removing an existing unobserved attribute]
+    expected: FAIL
+
+  [removeNamedItemNS on NamedNodeMap must not enqueue an attributeChanged reaction when removing an attribute that does not exist]
+    expected: FAIL
+
+  [removeNamedItemNS on NamedNodeMap must not enqueue an attributeChanged reaction when removing an unobserved attribute]
+    expected: FAIL
+
+  [removeNamedItemNS on NamedNodeMap must enqueue an attributeChanged reaction when removing an existing attribute]
+    expected: FAIL
+
+  [removeNamedItemNS on NamedNodeMap must not enqueue an attributeChanged reaction when removing an existing unobserved attribute]
+    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
new file mode 100644
index 000000000..87acc9aa6
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/Node.html.ini
@@ -0,0 +1,44 @@
+[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
new file mode 100644
index 000000000..ccdf5de7c
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/ParentNode.html.ini
@@ -0,0 +1,14 @@
+[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
new file mode 100644
index 000000000..4ca3fcde7
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/reactions/Range.html.ini
@@ -0,0 +1,23 @@
+[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/custom-elements/v0/__dir__.ini b/testing/web-platform/meta/custom-elements/v0/__dir__.ini
new file mode 100644
index 000000000..ae323e6d5
--- /dev/null
+++ b/testing/web-platform/meta/custom-elements/v0/__dir__.ini
@@ -0,0 +1 @@
+disabled: We are going to move to the latest spec, so we don't care about the result of old tests.