[Webkit-unassigned] [Bug 207123] New: CSS Filter: drop-shadow() disappears when element is hidden by overflow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207123

            Bug ID: 207123
           Summary: CSS Filter: drop-shadow() disappears when element is
                    hidden by overflow
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: b.houdusse at whiteimp.com

When a drop-shadow() filter is applied to the child of an element with hidden overflow, the filter will only appear if at least 1px of the child element is still visible.
A test case is available here: https://codepen.io/chototoro/pen/Jjogeyd

Bug appears on Safari (12.1 and above), on macOS and iOS.
Behavior is normal on Chrome, Firefox, and Edge 79.

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