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[學習筆記] CSS2 聽覺參考

Posted on 2011-05-28 21:24 RTY 閱讀(224) 評論(0) 編輯收藏引用所屬分類: CSS

聽覺樣式表

聽覺樣式表可把語音合成與音響效果相組合，使用戶可以聽到信息，而無需進行閱讀。

聽覺呈現可用于：

視覺能力低弱的人士
幫助用戶學習閱讀
幫助有閱讀障礙的用戶
家庭娛樂
在汽車中使用

聽覺呈現通常會把文檔轉化為純文本，然后傳給屏幕閱讀器（可讀出屏幕上所有字符的一種程序）。

聽覺樣式表的一個例子：

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

上面的例子可以讓語音合成器演奏一段聲音，然后用男性的聲音讀出標題。

CSS2 聽覺參考

W3C : "W3C" 列的數字顯示出屬性由哪個 CSS 標準定義（CSS1 還是 CSS2）。

屬性	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

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[學習筆記] CSS2 聽覺參考

聽覺樣式表

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