Count element name validity per DOM versus HTML parsing.

third_party/WebKit/Source/core/dom/Document.idl

Index: third_party/WebKit/Source/core/dom/Document.idl
diff --git a/third_party/WebKit/Source/core/dom/Document.idl b/third_party/WebKit/Source/core/dom/Document.idl
index 136ae2c285a69c7b9be7dc4cb70f4768e4ba716e..bc6a55fa0e2bac0d8b016d668d6e7f7071004230 100644
--- a/third_party/WebKit/Source/core/dom/Document.idl
+++ b/third_party/WebKit/Source/core/dom/Document.idl
@@ -55,8 +55,10 @@ interface Document : Node {
     HTMLCollection getElementsByTagNameNS(DOMString? namespaceURI, DOMString localName);
     HTMLCollection getElementsByClassName(DOMString classNames);
 
-    [NewObject, DoNotTestNewObject, CustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName);
-    [NewObject, DoNotTestNewObject, CustomElementCallbacks, RaisesException] Element createElementNS(DOMString? namespaceURI, DOMString qualifiedName);
+    // TODO(dominicc): Remove CallWith= when crbug/648179 is fixed.
+    [CallWith=EnteredWindow, NewObject, DoNotTestNewObject, CustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName);
+    // TODO(dominicc): Remove CallWith= when crbug/648179 is fixed.
+    [CallWith=EnteredWindow, NewObject, DoNotTestNewObject, CustomElementCallbacks, RaisesException] Element createElementNS(DOMString? namespaceURI, DOMString qualifiedName);
     [NewObject] DocumentFragment createDocumentFragment();
     [NewObject] Text createTextNode(DOMString data);
     [NewObject, RaisesException] CDATASection createCDATASection(DOMString data);
@@ -176,8 +178,10 @@ interface Document : Node {
     [CallWith=ScriptState, CustomElementCallbacks, RaisesException, MeasureAs=DocumentRegisterElement] CustomElementConstructor registerElement(DOMString type, optional ElementRegistrationOptions options);
     // https://w3c.github.io/webcomponents/spec/custom/#extensions-to-document-interface-to-instantiate
     // FIXME: The typeExtension arguments should not be nullable.
-    [CustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName, (DOMString or Dictionary)? options);
-    [CustomElementCallbacks, RaisesException] Element createElementNS(DOMString? namespaceURI, DOMString qualifiedName, (DOMString or Dictionary)? options);
+    // TODO(dominicc): Remove CallWith= when crbug/648179 is fixed.
+    [CallWith=EnteredWindow, CustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName, (DOMString or Dictionary)? options);
+    // TODO(dominicc): Remove CallWith= when crbug/648179 is fixed.
+    [CallWith=EnteredWindow, CustomElementCallbacks, RaisesException] Element createElementNS(DOMString? namespaceURI, DOMString qualifiedName, (DOMString or Dictionary)? options);
 
     // Page Visibility
     // https://w3c.github.io/page-visibility/#extensions-to-the-document-interface