Media: Printing and Other Devices - The CSS - page 209

has already been downloaded. This rule is most useful for targeting
devices with small amounts of CSS.
/* style rules for all media */
@media all {
body {
body:#ddd;
color:#666;
}
}
/* style rules for print only */
@media print {
body {
body:#fff;
color:#000;
}
}
/* style rules for handheld and projection only */
@media handheld, projection {
body {
body:#000;
color:#fff;
}
}
Although you can have an @import rule inside a linked style sheet or an
@media rule inside either type of linked style sheet document, it is not
legal to nest an @media rule inside another @media rule. If you were to
define a media type with @media or @import inside an already restricted
block of code, the new media type would further restrict the targeted
media list.