When I was building my extension for finding unused CSS rules, I needed a way of qualifying any href value into a complete URI. I needed this because I wanted it to support stylesheets inside IE conditional comments, but of course to Firefox these are just comments — I had to parse each comment node [...] http://www.pheedo.com/img.phdo?i=e6e...2e6c966e05e057
Dealing with unqualified HREF values
Linear Mode
