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Fundamental Rendering Proerties



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Tagged Element Rendering
  Media Types
   all
   braille
   embossed
   handheld
   print
   projection
   screen
   speech
   tty
   tv
  Media Groups

Tagged Element Rendering

Tagged elements in a document are rendered by CSS rule according to the specified CSS properties. One important feature of CSS is to specify how a document to be presented on different media. And therefore some CSS properties are only designed for certain media.

Media Types

The media names of possible media types are.

all

to specify for all devices

braille

to specify for braille tactile feedback devices.

embossed

to specify for paged braille printers.

handheld

to specify for handheld devices (typically small screen, limited bandwidth).

print

to specify for paged material and for documents viewed on screen in print preview mode.

projection

to specify for projected presentation devices

screen

to specify for primarily color computer screens.

speech

to specify for speech synthesizers. CSS2 had a similar media type called 'aural"

tty

to specify for media using a fixed-pitch character grid (such as teletypes, terminals, or portable devices with limited display capabilities).

tv

to specify for television-type devices (low resolution, color, limited-scrollability screens, sound available).

Media Groups

Media devices can also be grouped according to the features of media device.

  • continuous or paged
  • visual, audio, speech, or tactile
  • grid (for character grid devices), or bitmap
  • iteractive (for devices that allow user interaction), or static
  • all
Media Types Media Groups
  continuous/paged visual/audio/speech/tactile grid/bitmap interactive/static
braille continuous tactile grid both
embossed paged tactile grid static
handheld both visual, audio, speech both both
print paged visual bitmap static
projection paged visual bitmap interactive
screen continuous visual, audio bitmap both
speech continuous speech N/A both
tty continuous visual grid both
tv both visual, audio bitmap both

Sources: https://www.w3.org/TR/CSS21/media.html

  • CSS 2.1
    • 'CSS-property-name'
    • 'CSS-pseudo-class-name'
    • 'CSS-value'
    • "css-attribute-name"
    • css-keyword-value
    • <css-basic-data-type>
  • Modifier Notation:
    • ( * ): zero or more; 
    • ( + ): one or more;
    • ( ? ): zero or one times;
    • (   ): exactly once
    • ( {A,B} ): at least A and at most B times
  • Grouping:
    • ( [] ): grouping
    • ( a b c ): all must occur in the given order
    • ( | ): one of separated alternatives must occur
    • ( || ): two or more of separated alternatives must occur in any order
    • ( && ): all separated alternatives must occur in any order

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References

  1. http://www.w3.org/TR/1999/REC-html401-1999, 1999, HTML 4.01 Specification: W3C Recommendation, updated 24 December 1999
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ID: 180200036 Last Updated: 2018/2/22 Revision: 0 Ref:

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