What are the '*' and '_' prefixes in css?

Question

Just stumbled upon this in a borrowed css file - something I've never noticed before, and punctuation in context is inherently hard to google:

.ez-radio { zoom: 1; *display:inline; _height:15px; }

What's the '*' prefix do?

And for the matter the underscore in _height?

Is this some new CSS3 trickery?

Answer 1

It's used for CSS hacks in Internet Explorer.

* is IE 6 - 7 only (thank you, mck89!)

_ is IE 6 and below.

Don't use them. If you need browser specific CSS definitions, use specialized CSS definitions instead.