-- v2: mshtml: Implement 'specified' for detached attributes. mshtml: Detach attribute nodes when removing the attribute from the element. mshtml: Use a helper function to find an attribute in the collection's list. mshtml: Use a BSTR to store the detached attribute's name. mshtml: Don't include non-specified attributes in getAttributeNode from mshtml: Only allow a specific set of builtin props as attributes. mshtml: Use HasAttribute instead of GetAttributeNode when checking if