Aural style sheets, a new functionality from CSS2, are mainly intended for Internet surfers with impaired vision. An aural rendering uses speech synthesis in order to read a page content. The aural style sheets gave birth to the concept of an aural canvas, and use a three-dimensional physical space and a temporal space to output sound as page elements are displayed and selected.

azimuth | cue | cue-after, cue-before | elevation | pause | pause-after, pause-before | pitch | pitch-range | play-during | richness | speak | speak-header | speak-numeral | speak-punctuation | speech-rate | stress | voice-family | volume

azimuth
Allows you to position the audio output. This is intended for spatial audio and multi-speaker systems.
CSS2 value	<angle> | [[left-side | far-left | left | center-left | center | center-right | right | far-right | right-side] || behind ]| leftwards | rightwards | inherit
Initial value	center
Applied to	All elements.
Inherited	Yes.
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cue
Defines the cue-before and cue-after properties. Produces a sound before or after an element appears.
CSS2 value	cue-before | cue-after | inherit
Initial value	Not defined.
Applied to	All elements.
Inherited	No.
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cue-after, cue-before
Outputs a sound after (cue-after) or before (cue-before) an element appears.
CSS2 value	<uri> | none | inherit
Initial value	none
Applied to	All elements.
Inherited	No.
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elevation
Positions the angle of a sound. This is intended for spatial audio and multi-speaker systems.
CSS2 value	<angle> | below | level | above | higher | lower | inherit
Initial value	level
Applied to	All elements.
Inherited	Yes.
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pause
Defines the pause-before and pause-after properties.
CSS2 value	<time> | <percentage> | inherit
Initial value	Depends on the browser.
Applied to	All elements.
Inherited	No.
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pause-after, pause-before
Specifies a pause to be observed before or after the aural rendering or speaking of an element's content.
CSS2 value	<time> | <percentage> | inherit
Initial value	Depends on the browser.
Applied to	All elements.
Inherited	No.
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pitch
Specifies the average pitch of the speaking voice.
CSS2 value	<frequency> | x-low | low | medium | high | x-high | inherit
Initial value	medium
Applied to	All elements.
Inherited	Yes.
Notes	The average frequency for a standard male voice is around 120Hz and, for a female voice, around 210Hz.
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pitch-range
Specifies a variation in the average frequency. Allows an author to introduce some nuances and to animate the voice.
CSS2 value	<number> | inherit
Initial value	50
Applied to	All elements.
Inherited	Yes.
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play-during
Specifies a sound to be played in the background while an element's content is being spoken.
CSS2 value	<uri> | mix? | repeat? | auto | none | inherit
Initial value	auto
Applied to	All elements.
Inherited	No.
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richness
Specifies the warmth and depth of the speaking voice.
CSS2 value	<number> | inherit
Initial value	50
Applied to	All elements.
Inherited	Yes.
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speak
Specifies if and how the text should be read.
CSS2 value	normal | none | spell-out | inherit
Initial value	normal
Applied to	All elements.
Inherited	Yes.
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speak-header
Specifies whether table headers should be aurally rendered before every cell, or only before one that is associated with a header which is different from that of the previous cell.
CSS2 value	once | always | inherit
Initial value	once
Applied to	Elements containing header information.
Inherited	Yes.
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speak-numeral
Specifies whether numerals should be rendered as individual digits (100 is read "one zero zero") or as full numbers (100 is read "hundred").
CSS2 value	digits | continuous | inherit
Initial value	continuous
Applied to	All elements.
Inherited	Yes.
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speak-punctuation
Controls how punctuation is rendered: either literally (comma, full stop, etc.) or naturally, by making a number of pauses.
CSS2 value	code | none | inherit
Initial value	none
Applied to	All elements.
Inherited	Yes.
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speech-rate
Specifies the reading speed.
CSS2 value	<number> | x-slow | slow | medium | fast | x-fast | faster | slower | inherit
Initial value	medium
Applied to	All elements.
Inherited	Yes.
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stress
Specifies the height of "local peaks" in the intonation of a voice. The amount of inflection is controlled through the stress markers.
CSS2 value	<number> | inherit
Initial value	50
Applied to	All elements.
Inherited	Yes.
Notes	Supplements the pitch-range property.
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voice-family
Specifies a comma-separated list of voice families.
CSS2 value	<specific-voice> | <generic-voice> | inherit
Initial value	Depends on the browser.
Applied to	All elements.
Inherited	Yes.
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volume
Specifies the average volume of a waveform. The values range from 0 (minimum audible level) to 100 (maximum comfort level).
CSS2 value	<number> | <percentage> | silent | x-soft | soft | medium | loud | x-loud | inherit
Initial value	medium
Applied to	All elements.
Inherited	Yes.
Notes	x-soft = 0, soft = 25, medium = 50, loud = 75, et x-loud = 100.
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