RFR: 8345188: Support tree-structural pseudo-classes [v8]

[Andy Goryachev]

On Wed, 8 Jan 2025 22:27:03 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> I wouldn't think you'd see it in those cases as that would primarily be hidden by the cost of adding all the children.

I agree.  Let me prototype something quickly - give me 10 minutes.

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PR Comment: https://git.openjdk.org/jfx/pull/1652#issuecomment-2578802698