[Webkit-unassigned] [Bug 227576] New: Animation bugs caused by background image

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227576

            Bug ID: 227576
           Summary: Animation bugs caused by background image
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben at deaxon.com

The background of the top bar on the following test page should always stay yellow, yet the black background flashes on every animation iteration:
http://sharedfil.es/M97qw2Khn.html

This bug only happens in Safari (macOS, iOS and iPadOS), and it's apparently caused by the linear gradient. If you replace the gradient by a simple background:yellow, the bug doesn't occur. It's also worth noting the bug only happens when the viewport is fairly large (I don't have an exact number but I'd say > 1000px on macOS, and only in landscape mode on iOS).

I recently stumbled upon similar bugs with different use cases, all of them being caused by a background gradient. Disabling the gradients always fixes the bugs.

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