Feature Request

Currently Sling Model that used to collect and include client libraries allows to add the onload attribute only to the javascript script tag. It would be useful to be able to add this attribute to the stylesheet link tag as well.

In my personal case I'm going to use this attribute to implement loading of non-critical css in a non-blocking way, but I think this attribute can also be useful in some other cases.

Solution
Add the onload attribute for css here: com.adobe.cq.wcm.core.components.internal.models.v1.ClientLibrariesImpl.

Example of usage
<sly data-sly-use.clientlibs="${'com.adobe.cq.wcm.core.components.models.ClientLibraries' @ categories='wknd.base',       media='print' onloadCss='this.media=\'all\''}">
          ${clientlibs.cssIncludes @ context="unsafe"}
</sly>

Result
<link rel="stylesheet" href="style.css" media="print" onload="this.media='all'">