Re: [w3c/webcomponents] Disabling tabindex across potentially many shadow roots (#520)

@rniwa yeah @dglazkov asked me to file it here as part of it relates to Shadow DOM.

> A bug in browser that focusable element makes animation slow even if it's not visible in the viewport

To clarify, the issue is there's no easy way to remove an entire shadow tree of elements from the tab order. It's my understanding (though I may be mistaken) that setting tabindex=-1 on the host would not remove the children from the tab order.

The animation use case is an example to demonstrate when someone would encounter this issue.

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