2.1.126 [HTML5:2014] Section 7.4.1 Sequential focus navigation and the tabindex attribute

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V0297: tabindex returns 0 as the default for elements that are not focusable

The specification states:

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     The tabIndex IDL attribute must reflect the value of the tabindex content attribute. 
     Its default value is 0 for elements that are focusable and −1 for [for all other 
     elements./elements that are not focusable].

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tabindex returns 0 as the default for elements that are not focusable.