Since implementing css themes in OpenACS is taking focus:
What about a feature that verifies a page's css references exist in the css?
For example, verify that a page's use of:
id="top-part" class="first-part" class="second-part"
is in css as:
#top-part .first-part .second-part
This is one feature that does not seem to be available in css validators and has been one of more common problems in dealing with (cross-browser) rendering issues.