Browser specific CSS rules silently fails
ie Something like the following will cause problems:
background-image: -moz-linear-gradient(top, #4687ce 0%, #3068a2 100%);
Any css rules after this will be blanked out. If you remove the '-' before 'moz' it works fine. This is mostly caused CSSFactory.parse, perhaps we should try to detect this and throw an exception (for now).