[Webkit-unassigned] [Bug 255358] New: isolation: isolate and mix-blend-mode: plus-lighter not applied correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255358

            Bug ID: 255358
           Summary: isolation: isolate and mix-blend-mode: plus-lighter
                    not applied correctly
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: flackr at chromium.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Using isolation: isolate on a container with mix-blend-mode: plus-lighter on descendents should result in no gaps between separately composited adjacent elements in the same isolation container. This works on Chrome and Firefox but on Safari there are visible gaps between elements, e.g. https://jsbin.com/norikac/edit?html,css,output

For a simpler example, see https://jsbin.com/jowoken/edit?html,css,output
Or, https://jsbin.com/retafoy/edit?html,css,output for the animation in a paused state showing a visible gap.

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