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| Description: |
In case you use CSS rules like the following
{code:java}
.title {
font-size: calc(1em + 2px);
}{code}
then the white-space surrounding the plus sign should survive the CSS compression.
Otherwise, it's a CSS syntax error and the corresponding CSS rule will be ignored.
Same with `calc` in combination with the minus sign.
In case you are [still using YUI compressor|https://github.com/xwiki/xwiki-platform/blob/7508c3a91ad2d506adc277f855f8018a7996aca8/xwiki-platform-core/xwiki-platform-skin/xwiki-platform-skin-skinx/src/main/java/com/xpn/xwiki/web/sx/CssExtension.java#L29], than then the problem is a bug in YUI compressor there :
[https://github.com/yui/yuicompressor/issues/330]
In that case, I guess, you should replace it with a modern CSS compressor.
Thank you very much in advance.
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