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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
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 | 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
2 cue A shorthand property for setting the cue-before and cue-after properties in one declaration 2 cue-after Specifies a sound to be played after speaking an element's content to delimit it from other 2 cue-before Specifies a sound to be played before speaking an element's content to delimit it from other 2 elevation Sets where the sound/voices should come from (vertically) - angle
- below
- level
- above
- higher
- lower
2 pause A shorthand property for setting the pause-before and pause-after properties in one declaration 2 pause-after Specifies a pause after speaking an element's content 2 pause-before Specifies a pause before speaking an element's content 2 pitch Specifies the speaking voice - frequency
- x-low
- low
- medium
- high
- x-high
2 pitch-range Specifies the variation in the speaking voice. (Monotone voice or animated voice?) 2 play-during Specifies a sound to be played while speaking an element's content 2 richness Specifies the richness in the speaking voice. (Rich voice or thin voice?) 2 speak Specifies whether content will render aurally 2 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 2 speak-numeral Specifies how to speak numbers 2 speak-punctuation Specifies how to speak punctuation characters 2 speech-rate Specifies the speed of the speaking - number
- x-slow
- slow
- medium
- fast
- x-fast
- faster
- slower
2 stress Specifies the "stress" in the speaking voice 2 voice-family A prioritized list of voice family names that contain specific voices - specific-voice
- generic-voice
2 volume Specifies the volume of the speaking - number
- %
- silent
- x-soft
- soft
- medium
- loud
- x-loud
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