[Webkit-unassigned] [Bug 256883] New: unexpected line rendered in <th> with border-radius

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256883

            Bug ID: 256883
           Summary: unexpected line rendered in <th> with border-radius
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: samuel at cendio.se
                CC: simon.fraser at apple.com

Created attachment 466378

  --> https://bugs.webkit.org/attachment.cgi?id=466378&action=review

simple HTML that illustrates the problem

A line renders in-between <th> elements when the first <th> has a border-top-left-radius set. The attached example HTML displays the issue in our end in most zoom levels, but not all. The text inside the <th> also seems to matter, some contents doesn't trigger the issue for some reason.

FYI, we ended up using border-top-left-radius like this due to bug 251909.

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