Re: [w3c/webcomponents] In Shadow DOM v1, tabIndex=-1 makes all elements inside the shadow tree to be no tab-focusable (#774)

Setting `tabindex=-1` on a shadow host as the effect of disabling the focus of the component. We have builtin elements like input and video elements, and if `tabindex=-1` is set on either element, then its content including buttons and media controls aren't focusable. That is, the intention of setting `tabindex=-1` is to make that particular reusable element not focusable including its implementation details.

Using `tabindex=-1` instead of `delegatesFocus` for focus delegation is a wrong thing to do, and we should really [add `delegatesFocus` back to the HTML specification](https://github.com/whatwg/html/issues/2013)

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