Feature Request: New component <o:criticalStylesheet> for Critical CSS

[banifou]

It is such a pity that there is nothing like 'criticalCSS' for JSF. It would be nice to have at least a new component like '<o:criticalStylesheet>'. When this component appears in the header, the CombinedResourceHandler should leave the CSS file inlined and remove all separate stylesheet resources, creating a combined and non-blocking one for all stylesheets.

The non-blocking stylesheet should look as follows:
<link rel="preload" href="nonBlockingCombined.css" as="style" onload="this.onload=null;this.rel='stylesheet'"> <noscript><link rel="stylesheet" href="nonBlockingCombined.css"></noscript>

It should have an option, whether the nonBlockingCombined CSS should or should not contain the primefaces stylesheets components.css and layout.css.

[BalusC]

<o:criticalStylesheet> has been added to OmniFaces 4.5.
The CombinedResourceHandler transparently recognizes it.

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It should have an option, whether the nonBlockingCombined CSS should or should not contain the primefaces stylesheets components.css and layout.css.

Simply explicitly redeclare them as <o:criticalStylesheet>:

<o:criticalStylesheet library="primefaces" name="components.css" />
<o:criticalStylesheet library="primefaces" name="layout.css" />