Re: [w3c/webcomponents] Focus delegation from shadow host should not behave like sequential focus navigation (#830)

I haven't used `delegatesFocus` yet. Maybe @azakus, who's working on the material design components, can comment from actual usage.

But reading the details (thanks for the very clear explanation @rakina), it doesn't sound to me like any choice is going to be all that great. We have to choose either the first sequential or first clickable focusable element - and in either case we're only inferring what the component author wants in the face of no explicit `onfocus` event handler. I honestly find either choice strange in its own way. `tabindex-1` could be interpreted to mean "only focus this element explicitly" and yet the proposed change would add a new want to focus it without actually clicking it or calling `focus()`.

The thing I find particularly strange about the proposed change is that we'd be picking the _first_ click-focusable element, ie sequentially., where order doesn't matter otherwise. At least with Chrome's current behavior the author already expects that tabindex ordering and tree-order matter.

All that said, I don't feel particularly strongly here.

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