[Webkit-unassigned] [Bug 155823] New: multi-column + border-radius + overflow:hidden = no background-image

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155823

            Bug ID: 155823
           Summary: multi-column + border-radius + overflow:hidden = no
                    background-image
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com
                CC: simon.fraser at apple.com

Created attachment 274806
  --> https://bugs.webkit.org/attachment.cgi?id=274806&action=review
Screenshot of incorrect rendering in Safari 9.1

Original Bootstrap bug: https://github.com/twbs/bootstrap/issues/19600
Similar Chrome bug: https://bugs.chromium.org/p/chromium/issues/detail?id=597471

Steps to reproduce:
1. Open https://jsfiddle.net/cvrebert/q7750s03/ in OS X Safari 9.1
2. Observe the right square.

Expected results:
The right square should match the left square and show a pentagram image.
See attached Firefox screenshot.

Actual results:
The right square doesn't match the left square.
The right square is solid white instead of showing a pentagram image.
See attached Safari screenshot.

For some reason, when combined with certain other CSS properties,
the `background-image` of boxes in columns in CSS multi-column layouts (other than the 1st column) isn't shown by WebKit.

More info:
Removing the `border-radius` or the `overflow:hidden` from the example avoids triggering the bug.
Firefox 47, Chrome Canary 51, and Edge 13 all render the example correctly.

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