Since the JSF2.2 supports HTML friednly markup, the CC should show at HTML elements of facelets also elements from the http://xmlns.jcp.org/jsf namespace.
It means that it should offer at "a" tag, elements like "disabled, fragment" etc. At least values which are not ignored by the renderer:
jsf-2.2 spec -> renderkitdocs/index.html
CC for jsf: attributes implemented in web-main #5dcd0e6f4ff9.
Integrated into 'main-silver', will be available in build *201311170002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Martin Fousek <email@example.com>
Log: #232344 - Improve the html Code completion in Facelets file to offer attributes from http://xmlns.jcp.org/jsf namespace