[Webkit-unassigned] [Bug 158184] New: CSS Transitions don't occur when parent elements lose/gain "display: flex"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158184

            Bug ID: 158184
           Summary: CSS Transitions don't occur when parent elements
                    lose/gain "display: flex"
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xymostech at gmail.com
                CC: dino at apple.com

Example URL:
https://jsbin.com/zekeko/edit

Steps to reproduce the problem:
1. Make a container with display: flex
2. Add a CSS transition property to children of the container
3. Attempt to trigger the transition at the same time as removing display: flex from the container

What is the expected behavior?
The CSS transitions should happen.

What went wrong?
The transitions don't occur; instead, the style updates immediately.

Also occurs in Chrome. Reported at https://bugs.chromium.org/p/chromium/issues/detail?id=615653#

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