[Webkit-unassigned] [Bug 209681] New: CSS Columns child items hidden when relatively positioned

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209681

            Bug ID: 209681
           Summary: CSS Columns child items hidden when relatively
                    positioned
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: onlyforhisname at gmail.com

Created attachment 394760

  --> https://bugs.webkit.org/attachment.cgi?id=394760&action=review

Shows the column bug occurring with the minimum amount of css

Noticed in Safari Version 13.1 (14609.1.20.111.8), verified still present in Mojave r259135

(See attachment or https://codepen.io/onlyforhisname/pen/LYVMLEV)
When an item contains multiple columns using column-count or column-width and the first-level items have overflow hidden, any second-level children with position relative still take up space but are not visible (unless they are in the first column).

May be related to https://bugs.webkit.org/show_bug.cgi?id=207991

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