[Webkit-unassigned] [Bug 167901] New: Animated GIFs fail to play in multi-column layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167901

            Bug ID: 167901
           Summary: Animated GIFs fail to play in multi-column layout
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eprev at me.com

When multiple animated GIFs are placed in multi-column container, Safari (10 and TP) will manage to play only a few of them.
More GIFs you put in, higher chance they fail to play. This is happening only when the value of `columns` property is greater than 1.

How to reproduce:
1) Open https://jsfiddle.net/sdxaxuv5/
2) Usually last two images (in 3rd column) fail to start playing.
3) Change `columns` property's value from 3 to 1, and the issue will disappear.

Checked on both iMac and iOS. Other browsers play all the images.

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