网页制作学习CSS2的听觉参考
听觉样式表听觉样式表可把语音合成与音响效果相组合，使得用户可以听到信息，而不用进行阅读。
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: The number in the "W3C" column indicates in which CSS recommendation the property is defined (CSS1 or 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 declarationcue-before
cue-after
2
cue-afterSpecifies a sound to be played after speaking an element's content to delimit it from othernone
url
2
cue-beforeSpecifies a sound to be played before speaking an element's content to delimit it from othernone
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 declarationpause-before
pause-after
2
pause-afterSpecifies a pause after speaking an element's contenttime
%
2
pause-beforeSpecifies a pause before speaking an element's contenttime
%
2
pitchSpecifies the speaking voicefrequency
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 contentauto
none
url
mix
repeat
2
richnessSpecifies the richness in the speaking voice. (Rich voice or thin voice?)number
2
speakSpecifies whether content will render aurallynormal
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 cellalways
once
2
speak-numeralSpecifies how to speak numbersdigits
continuous
2
speak-punctuationSpecifies how to speak punctuation charactersnone
code
2
speech-rateSpecifies the speed of the speakingnumber
x-slow
slow
medium
fast
x-fast
faster
slower
2
stressSpecifies the "stress" in the speaking voicenumber
2
voice-familyA prioritized list of voice family names that contain specific voicesspecific-voice
generic-voice
2
volumeSpecifies the volume of the speakingnumber
%
silent
x-soft
soft
medium
loud
x-loud
2
关键词：网页制作,CSS
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