RFR: 8268225: Support :focus-visible and :focus-within CSS pseudoclasses [v7]

[Jeanette Winzenburg]

On Fri, 20 Aug 2021 05:15:49 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> This PR adds the `Node.focusVisible` and `Node.focusWithin` properties, as well as the corresponding `:focus-visible` and `:focus-within` CSS pseudo-classes.
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed undeterministic test failures

Just curious: with this in place, would it be possible to use for supporting [JDK-8087926](https://bugs.openjdk.java.net/browse/JDK-8087926) (it's a bit vague, though, at least for me)?

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PR: https://git.openjdk.java.net/jfx/pull/475