[Webkit-unassigned] [Bug 181248] New: Element occupy vertical space in flexbox when has no height

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=181248

            Bug ID: 181248
           Summary: Element occupy vertical space in flexbox when has no
                    height
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland at nextendweb.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Example URL:
https://jsfiddle.net/e9fkLcwe/4/

Steps to reproduce the problem:
1. Open https://jsfiddle.net/e9fkLcwe/4/
2. Click on any button which starts with "Break after ..."
3. You will see grey lines where the ".break-row" div added

What is the expected behaviour?
As the element with .break-row class has 0px height, it should not occupy vertical space in the area. .col elements should fill the available vertical space.

What went wrong?
.break-row element filled up vertical space, therefore, we able to see the background of the container.


Does this work in other browsers? No

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