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https://issues.apache.org/jira/browse/TAP5-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16741990#comment-16741990
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Balázs Palcsó commented on TAP5-2524:
-------------------------------------

There is an open PR now in YUI compressor project, but has not been merged for 
while: https://github.com/yui/yuicompressor/pull/312

> CSS minification breaks keyframes 
> ----------------------------------
>
>                 Key: TAP5-2524
>                 URL: https://issues.apache.org/jira/browse/TAP5-2524
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-webresources
>    Affects Versions: 5.4
>            Reporter: Jochen Kemnade
>            Assignee: Jochen Kemnade
>            Priority: Major
>             Fix For: 5.4.1
>
>
> {code}
> @keyframes anim {
>     0% { opacity: 0; }
>   100% { opacity: 1; }
> }
> {code}
> is turned into
> {code}
> @keyframes anim{0{opacity:0}100%{opacity:1}}
> {code}
> but that should be
> {code}
> @keyframes anim{0%{opacity:0}100%{opacity:1}}
> {code}
> See https://github.com/yui/yuicompressor/issues/151, 
> https://github.com/yui/yuicompressor/issues/162, 
> https://github.com/yui/yuicompressor/pull/118, 
> https://github.com/yui/yuicompressor/issues/80 and others.



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