Implement spec-compliant HTMLElement.prototype.isContentEditable

third_party/WebKit/Source/core/editing/EditingUtilities.h

Index: third_party/WebKit/Source/core/editing/EditingUtilities.h
diff --git a/third_party/WebKit/Source/core/editing/EditingUtilities.h b/third_party/WebKit/Source/core/editing/EditingUtilities.h
index 558b274897baf02a12ca73ae04cbe3b9f0cf1ef3..dba406f48f9747aedcc78b2d393b9fb7dfb32053 100644
--- a/third_party/WebKit/Source/core/editing/EditingUtilities.h
+++ b/third_party/WebKit/Source/core/editing/EditingUtilities.h
@@ -72,6 +72,16 @@ CORE_EXPORT bool needsLayoutTreeUpdate(const Position&);
 // Node
 // -------------------------------------------------------------------------
 
+// Style-independent editability.  These functions are useless in Blink editing
+// code.
+
+// https://w3c.github.io/editing/execCommand.html#editing-host
+bool isEditingHost(const Node&);

[yosin_UTC9, 2016/07/27 01:34:36]

Could you rename |isEditingHost()| or |isEditable()| to 
 - |isEditingHostWithoutStyle()| or
 - |isEditingHostIgnoringStyle()| or
 - something other
to avoid use them in other than "HTMLElement.cpp".
Or, move to "HTMLElement.cpp" as static function?

WDYT?

+// https://w3c.github.io/editing/execCommand.html#editable
+bool isEditable(const Node&);
+
+// Style-dependent editability
+
 CORE_EXPORT bool isContentEditable(const Node&);
 CORE_EXPORT bool isContentRichlyEditable(const Node&);
 CORE_EXPORT bool hasEditableStyle(const Node&, EditableType = ContentIsEditable);