[Webkit-unassigned] [Bug 279962] [view-transitions] https://simple-set-demos.glitch.me/5-heading-text/ glitches

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=279962

Matt Woodrow <mattwoodrow at apple.com> changed:

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                 CC|                            |mattwoodrow at apple.com

--- Comment #11 from Matt Woodrow <mattwoodrow at apple.com> ---
(In reply to Tim Nguyen (:ntim) from comment #10)
> Maybe something to consider is to return true here:
> `RenderView::shouldPaintBaseBackground` when a view transition is running,
> or to paint a white background behind all snapshots.

What about in dark mode?

If I'm reading it correctly, the test is fading out the old snapshot entirely, before fading in the new snapshot.

That leaves a period where users can see what's behind the snapshots, which I believe should be the 'canvas surface' - https://www.w3.org/TR/css-backgrounds-3/#canvas-surface.

That's typically white, but the spec explicitly clarifies that it doesn't need to be, and indeed is not in Safari at times.

Possibly we should force it back to white while a view transition is animating, but it's not obvious that authors should be relying on this (without spec additions).

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