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

Excellent browser support.

It was part of the CSS1 spec and has been around forever, and was always easy enough to implement that browsers appear to have gotten it right on the first try.

At the very least (from personal experience) IE5.5+, Firefox 1+, Safari 3+, Chrome 1+.

Pretty much supported by every browser that supports CSS (which is every browser you care about).

Answer 2

According to Wiki, IE7, FireFox 1.0, Safari 1.0, Opera 7, and Chrome fully support !important. IE6 supports it, but it does have a bug. If you do this, color will be red:

h1 {   color: green !important;   color: red; }