RFR: 8268225: Support :focus-visible and :focus-within CSS pseudoclasses

[Kevin Rushforth]

On Wed, 21 Apr 2021 18:17:27 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.

I note that the discussion hasn't finished on the openjfx-dev mailing list as to whether to accept this feature. The proposed API and docs in this PR can be used to inform the discussion, but it's premature to start the code review.

If it ends up going forward, it will need a CSR and 2 reviewers.

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