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[学习笔记] CSS2 听觉参考

Posted on 2011-05-28 21:24 RTY 阅读(199) 评论(0)  编辑 收藏 引用 所属分类: CSS

听觉样式表

听觉样式表可把语音合成与音响效果相组合，使用户可以听到信息，而无需进行阅读。

听觉呈现可用于：

  • 视觉能力低弱的人士
  • 帮助用户学习阅读
  • 帮助有阅读障碍的用户
  • 家庭娱乐
  • 在汽车中使用

听觉呈现通常会把文档转化为纯文本，然后传给屏幕阅读器（可读出屏幕上所有字符的一种程序）。

听觉样式表的一个例子：

h1, h2, h3, h4 { voice-family: male; richness: 80; cue-before: url("beep.au") }

上面的例子可以让语音合成器演奏一段声音，然后用男性的声音读出标题。

CSS2 听觉参考

W3C : "W3C" 列的数字显示出属性由哪个 CSS 标准定义（CSS1 还是 CSS2）。

属性描述值W3C
azimuthSets where the sound/voices should come from (horizontally)
  • angle
  • left-side
  • far-left
  • left
  • center-left
  • center
  • center-right
  • right
  • far-right
  • right-side
  • behind
  • leftwards
  • rightwards
2
cueA shorthand property for setting the cue-before and cue-after properties in one declaration
  • cue-before
  • cue-after
2
cue-afterSpecifies a sound to be played after speaking an element's content to delimit it from other
  • none
  • url
2
cue-beforeSpecifies a sound to be played before speaking an element's content to delimit it from other
  • none
  • url
2
elevationSets where the sound/voices should come from (vertically)
  • angle
  • below
  • level
  • above
  • higher
  • lower 
2
pauseA shorthand property for setting the pause-before and pause-after properties in one declaration
  • pause-before
  • pause-after
2
pause-afterSpecifies a pause after speaking an element's content
  • time
  • %
2
pause-beforeSpecifies a pause before speaking an element's content
  • time
  • %
2
pitchSpecifies the speaking voice
  • frequency
  • x-low
  • low
  • medium
  • high
  • x-high 
2
pitch-rangeSpecifies the variation in the speaking voice. (Monotone voice or animated voice?)
  • number
2
play-duringSpecifies a sound to be played while speaking an element's content
  • auto
  • none
  • url
  • mix
  • repeat
2
richnessSpecifies the richness in the speaking voice. (Rich voice or thin voice?)
  • number
2
speakSpecifies whether content will render aurally
  • normal
  • none
  • spell-out
2
speak-headerSpecifies how to handle table headers. Should the headers be spoken before every cell, or only before a cell with a different header than the previous cell
  • always
  • once
2
speak-numeralSpecifies how to speak numbers
  • digits
  • continuous
2
speak-punctuationSpecifies how to speak punctuation characters
  • none
  • code
2
speech-rateSpecifies the speed of the speaking
  • number
  • x-slow
  • slow
  • medium
  • fast
  • x-fast
  • faster
  • slower 
2
stressSpecifies the "stress" in the speaking voice
  • number
2
voice-familyA prioritized list of voice family names that contain specific voices
  • specific-voice
  • generic-voice
2
volumeSpecifies the volume of the speaking
  • number
  • %
  • silent
  • x-soft
  • soft
  • medium
  • loud
  • x-loud 
2

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