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7 Media types

7.1 Introduction to media types

A feature of style sheets is that they specify how a document is to be presented on different media: on the screen, on paper, with a speech synthesizer, with a braille device, etc.

Some properties are only for particular media (e.g., cue-before: aural user agents).
media types may share a property, but require different values.
For example font-size is useful both for screen and print media. , the two media are different enough to require different values ; a document will typically need a larger font on a computer screen than on paper.
sans-serif fonts are easier to read on screen, serifs are easier to read on paper. Sections of a style sheet -- applies to certain media types.

7.2 Specifying media-dependent style sheets

7.3 types

aural speech synthesizers. See aural style sheets
braille braille tactile feedback devices.
embossed paged braille printers.
handheld Intended for handheld devices (typically small screen, monochrome, limited bandwidth).
print paged, opaque material and for documents viewed on screen in print preview mode. See paged media for formatting issues
projection  presentations, for example projectors or print to transparencies. See paged media for formatting issues
screen color computer screens.
tty fixed-pitch character grid, such as teletypes, terminals, or portable devices with limited display capabilities. Do not use pixel units with this
tv low resolution, color, limited-scrollability screens, sound available).

7.3.1 groups

Relationship between media groups and media types
Media Groups
aural continuous auralN/Ainteractive
braille continuous tactilegridinteractive
emboss paged tactilegridinteractive
handheldboth visualbothinteractive
print paged visualbitmap 
projectionpaged visualbitmap 
screen continuous visualbitmapinteractive
tty continuous visualgridinteractive
tv both visual, auralbitmapinteractive