2.1.37 [W3C-HTML52] Section 4.9.10. The th element

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V0137: The abbr attribute is not defined directly on the HTMLTableHeaderCellElement interface

The specification states:

 4.9.10 The th element
     ...
     DOM interface:
  
         interface HTMLTableHeaderCellElement : HTMLTableCellElement {
             ...
             attribute DOMString abbr;
         };

EdgeHTML Mode

The abbr attribute is not defined directly on the HTMLTableHeaderCellElement interface. Instead, it is abstracted to the base class HTMLTableCellElement.