[Webkit-unassigned] [Bug 187903] New: Table caption tag jumps to the bottom of the table if table has a positioned child element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187903

            Bug ID: 187903
           Summary: Table caption tag jumps to the bottom of the table if
                    table has a positioned child element
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webschik at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Environment:

Safari: 11.1.1 (12605.2.8)
macOS Sierra: 10.12.6 (16G1408)

Bug description:

When <table> has a positioned child element (or an element that creates a new stacking context), and we hide/show this element, the table <caption> element starts jumping to the bottom of the table and back.


How to reproduce:

1) Go to https://codepen.io/webschik/pen/ZjeqBg
2) Move a cursor to the table cell to show the popup element and see how table <caption> behaves.

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