[Webkit-unassigned] [Bug 197654] New: Translucent gradient rendering bug due to will-change transform

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197654

            Bug ID: 197654
           Summary: Translucent gradient rendering bug due to will-change
                    transform
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonastreub at me.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Overview:

When toggling an element background from a color to a translucent gradient the gradient sometimes gets a black background.
This only appears to happen when will-change transform is enabled for the element.

1) View the example: https://codepen.io/jonastreub/pen/XwbWaR

2) Toggle the element background by clicking it

3) Notice that the gradient has a black background

Expected Results: The gradient to be translucent.

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