CSS 听觉参考手册

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：

  1. h1, h2, h3, h4
  2. {
  3. voice-family: male;
  4. richness: 80;
  5. cue-before: url("beep.au")
  6. }

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 cue-before
cue-after 		2
cue-after Specifies a sound to be played after speaking an element's content to delimit it from other none
url 		2
cue-before Specifies a sound to be played before speaking an element's content to delimit it from other none
url 		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 pause-before
pause-after 		2
pause-after Specifies a pause after speaking an element's content time
% 		2
pause-before Specifies a pause before speaking an element's content time
% 		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?) number 2
play-during Specifies a sound to be played while speaking an element's content auto
none
url
mix
repeat 		2
richness Specifies the richness in the speaking voice. (Rich voice or thin voice?) number 2
speak Specifies whether content will render aurally normal
none
spell-out 		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 always
once 		2
speak-numeral Specifies how to speak numbers digits
continuous 		2
speak-punctuation Specifies how to speak punctuation characters none
code 		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 number 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 		2