Test that if a focused element becomes expressly inert, it stops being focused #31776
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https://html.spec.whatwg.org/multipage/interaction.html#focus-fixup-rule
Blink passes the test now, used to fail before https://crrev.com/941651
since enabling inertness was not enough, also needed a style recalc.
Firefox and WebKit fail the test since they don't seem to implement
the focus fixup at all, e.g. removing tabindex attr doesn't work either.