The W3C Cascading Style Sheets working group has posted a second candidate recommendation of Media Queries:
HTML4 and CSS2 currently support media-dependent style sheets tailored for different media types. For example, a document may use sans-serif fonts when displayed on a screen and serif fonts when printed. ‘
screen’ and ‘
A media query consists of a media type and zero or more expressions to limit the scope of style sheets. Among the media features that can be used in media queries are ‘
height’, and ‘
color’. By using media queries, presentations can be tailored to a specific range of output devices without changing the content itself.