What browsers support “!important”?

Question

Which browsers support the CSS !important directive, and what are the various quirks amongst the different browsers that do support it?

Answer 1

All browsers apart from IE6 support it which makes it quite handy for CSS hacks. Example:

#someElement { width:200px !important; width:198px; }

All browsers apart from IE6 will render #someElement at 200px because they will honor the !important. IE6 however will just ignore the !important and render #someElement at 198px.

EDIT: Most common use case scenario for this (at least with me) is using it to correct the double margin bug in IE6