AX nodes that aren't contenteditable should be readonly.

Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 332 matching lines @@
     case TabRole:
     case TextAreaRole:
     case TextFieldRole:
     case ToggleButtonRole:
         return true;
     default:
         return false;
     }
 }
 
+bool AXObject::isReadOnly() const
+{
+    if (node())
+        return !node()->hasEditableStyle();
+
+    return true;
+}
+
 bool AXObject::accessibilityIsIgnored() const
 {
     updateCachedAttributeValuesIfNeeded();
     return m_cachedIsIgnored;
 }
 
 void AXObject::updateCachedAttributeValuesIfNeeded() const
 {
     AXObjectCacheImpl* cache = axObjectCache();
     if (!cache)
@@ skipping 754 matching lines @@
 }
 
 const AtomicString& AXObject::roleName(AccessibilityRole role)
 {
     static const Vector<AtomicString>* roleNameVector = createRoleNameVector();
 
     return roleNameVector->at(role);
 }
 
 } // namespace blink