[Webkit-unassigned] [Bug 226406] New: background image gradient colors wrong when background-attachment:fixed is used inside scrollable element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226406

            Bug ID: 226406
           Summary: background image gradient colors wrong when
                    background-attachment:fixed is used inside scrollable
                    element
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 430074

  --> https://bugs.webkit.org/attachment.cgi?id=430074&action=review

test

Noticed this while working on bug 226399.  Only tested on macOS.  STR:

1. Open the test case.
2. Resize the Safari window as small as possible while still showing the entire blue-bordered element.
3. Scroll the blue-bordered element down.
4. Notice that about half way through the scrollable area, the gradient changes colors slightly.

I reproduced on the oldest Safari I could run on my Big Sur machine.

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