Re: [w3c/webcomponents] :focus behavior of delegatesFocus:true will be confusing for users (#554)

We already have overloaded meaning for "tabindex" attribute (determine tab order, and making the element focusable), I'm reluctant to add another meaning of "making it match for `:focus` when
`delegatesFocus=true` shadow root is attached and inner element has focus".

IMHO we can do either
* Preserve the current behavior as is
* Remove the recursive `:focus` matching completely, and make the `:focus` only match to the element which has real focus

In the latter case, you lose the ability to make `<input type="date">`-compatible `<date-input>`, and
the component user loses the ability to style by `:focus { ... }` equally for native elements and custom
elements. On the other hand you can make sure only one element in a shadow-including document 
matches `:focus` rule.

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