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

@domenic, yes, there are three categories if we include non-focusable.  I meant categories in default focusable elements.

In Safari, the second category in my comment is not mouse-focusable even if Full Keyboard Access setting is "All controls".
Behavior of overflowed elements and ```<video controls>``` may be implementation bugs which we should fix.

```tabindex``` attribute should override the default focus behavior, right? 


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