Backed out changeset bde709210e59 (bug 1274159)

testing/web-platform/meta/custom-elements/CustomElementRegistry.html.ini

@@ -18,6 +18,9 @@
   [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
 

testing/web-platform/meta/custom-elements/Document-createElement.html.ini

@@ -12,6 +12,9 @@
   [document.createElement must report a NotSupportedError when attribute is added by attributes.setNamedItem during construction]
     expected: FAIL
 
+  [document.createElement must not report a NotSupportedError when attribute is added and removed during construction]
+    expected: FAIL
+
   [document.createElement must report a NotSupportedError when a Text child is added during construction]
     expected: FAIL
 

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
+

testing/web-platform/meta/custom-elements/htmlconstructor/newtarget.html.ini

@@ -0,0 +1,38 @@
+[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
+
+  [If prototype is not object (null), derives the fallback from NewTarget's realm (autonomous custom elements)]
+    expected: FAIL
+
+  [If prototype is not object (undefined), derives the fallback from NewTarget's realm (autonomous custom elements)]
+    expected: FAIL
+
+  [If prototype is not object (5), derives the fallback from NewTarget's realm (autonomous custom elements)]
+    expected: FAIL
+
+  [If prototype is not object (string), derives the fallback from NewTarget's realm (autonomous custom elements)]
+    expected: FAIL
+
+  [If prototype is not object (null), derives the fallback from NewTarget's realm (customized built-in elements)]
+    expected: FAIL
+
+  [If prototype is not object (undefined), derives the fallback from NewTarget's realm (customized built-in elements)]
+    expected: FAIL
+
+  [If prototype is not object (5), derives the fallback from NewTarget's realm (customized built-in elements)]
+    expected: FAIL
+
+  [If prototype is not object (string), derives the fallback from NewTarget's realm (customized built-in elements)]
+    expected: FAIL
+