[Webkit-unassigned] [Bug 197957] New: Translucent border rendering issue in combination with gradient background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197957

            Bug ID: 197957
           Summary: Translucent border rendering issue in combination with
                    gradient background
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonastreub at me.com

Overview:

Translucent border looks off when rendering in combination with a gradient background.

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

2) Notice that the border looks off on the top and bottom sides

Expected Results: translucent border to darken the background evenly

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