MediaDesc
Attribute values of type MediaDesc are media descriptors--a comma-separated list of media for which the linked resource is tailored. Media descriptors are case-sensitive.

The following media descriptors are defined in HTML 4.0:

screen (the default), for non-paged computer screens;
tty, for fixed-pitch character grid displays (such as the display used by Lynx);
tv, for television-type devices with low resolution and limited scrollability;
projection, for projectors;
handheld, for handheld devices (characterized by a small, monochrome display and limited bandwidth);
print, for output to a printer;

braille, for braille tactile feedback devices;
aural, for speech synthesizers;
all, for all devices.