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CSS听觉参考

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CSS2 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

媒介类型 描述
azimuth Sets 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
cue A shorthand property for setting the cue-before and cue-after properties in one declaration cue-before
cue-after
cue-after Specifies a sound to be played after speaking an element's content to delimit it from other none
url
cue-before Specifies a sound to be played before speaking an element's content to delimit it from other none
url
elevation Sets where the sound/voices should come from (vertically) angle

below
level
above
higher
lower
pause A shorthand property for setting the pause-before and pause-after properties in one declaration pause-before
pause-after
pause-after Specifies a pause after speaking an element's content time
%
pause-before Specifies a pause before speaking an element's content time
%
pitch Specifies the speaking voice frequency
x-low
low
medium
high
x-high
pitch-range Specifies the variation in the speaking voice. (Monotone voice or animated voice?) number
play-during Specifies a sound to be played while speaking an element's content auto
none
url
mix
repeat
richness Specifies the richness in the speaking voice. (Rich voice or thin voice?) number
speak Specifies whether content will render aurally normal
none
spell-out
speak-header Specifies 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
speak-numeral Specifies how to speak numbers digits
continuous
speak-punctuation Specifies how to speak punctuation characters none
code
speech-rate Specifies the speed of the speaking number
x-slow
slow
medium
fast
x-fast
faster
slower
stress Specifies the "stress" in the speaking voice number
voice-family A prioritized list of voice family names that contain specific voices specific-voice
generic-voice
volume Specifies the volume of the speaking number
%
silent
x-soft
soft
medium
loud
x-loud
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