[Webkit-unassigned] [Bug 169001] [GTK] Volume button is broken on YouTube

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169001

--- Comment #6 from Charlie Turner <cturner at igalia.com> ---
Created attachment 314948

  --> https://bugs.webkit.org/attachment.cgi?id=314948&action=review

Reduced test case showing more clearly what might be happening

The problem is specific to an SVG being composited on a button, explaining the platform specific nature of this issue. If you take the SVG out of the button, it renders correctly.

It seems to be how much of the SVG viewport is exposed after clipping (and hence how much of the button to let through). When there is some exposure, we get rendering artefacts, when there isn't it renders correctly.

I hope this might narrow down where this could be happening to someone familiar with the renderer/compositor and how native GUI widgets are used in the browser.

The attachment should help show the issue more clearly.

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