[whatwg/fullscreen] How does top layer interact with CSS isolation? (#71)

In https://crbug.com/673976 it was reported that the isolation property isn't reset by Fullscreen in Chromium, with https://jsfiddle.net/2qvw0asr/2/ demonstrating the problem.

As https://drafts.fxtf.org/compositing-1/#isolation talks about stacking contexts does too https://fullscreen.spec.whatwg.org/#new-stacking-layer it's not obvious how they interact. Is an UA style sheet override needed, and should the computed style for `isolation` change?

Note that Chromium does not yet implement Fullscreen in terms of top layer, so it's possible that this is a non-issue spec side.

@upsuper 

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