CQ uses YUI Compressor to control the handling of client libraries for JavaScript and CSS minification to preserve the operational qualities of the code while reducing its overall byte footprint. The cq5.5 uses yuicompressor-2.3.6.jar. The latest yuicompressor-2.4.7.jar includes fixes for several bugs, such as media queries handling.
Lataa
Test completely in lower envirnoment to ensure that updated YUI jar does not cause any problems.
Also AEM5.6 GA version contains latest yui 2.4.7 compressor.
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