Re: [w3c/webcomponents] Mechanism for setting the tabindex focus flag without sprouting tabindex attribute? (#762)

A possible API is:

    interface ElementIntenals {
      attribute boolean defaultTabindexFocusFlag;
    }

If the ```tabindex``` content attribute of the target element is omitted or the attribute value is not parsable, '[tabindex focus flag](https://html.spec.whatwg.org/multipage/interaction.html#specially-focusable)' is initialized with ```defaultTabindexFocusFlag``` value.


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