What does !important mean in CSS?

Question

What does !important mean in CSS?

Is it available in CSS 2? CSS 3?

Where is it supported? All modern browsers?

Answer 1

!important is a part of CSS1.

Browsers supporting it: IE5.5+, Firefox 1+, Safari 3+, Chrome 1+.

It means, something like:

Use me, if there is nothing important else around!

Cant say it better.