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            [學(xué)習(xí)筆記] CSS2 聽覺參考

            Posted on 2011-05-28 21:24 RTY 閱讀(211) 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(jìn)行閱讀。

            聽覺呈現(xiàn)可用于:

            • 視覺能力低弱的人士
            • 幫助用戶學(xué)習(xí)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(xiàn)通常會(huì)把文檔轉(zhuǎn)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(gè)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(biāo)題。

            CSS2 聽覺參考

            W3C : "W3C" 列的數(shù)字顯示出屬性由哪個(gè) CSS 標(biāo)準(zhǔn)定義(CSS1 還是 CSS2)。

            屬性描述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 declaration
            • cue-before
            • cue-after
            2
            cue-afterSpecifies a sound to be played after speaking an element's content to delimit it from other
            • none
            • url
            2
            cue-beforeSpecifies a sound to be played before speaking an element's content to delimit it from other
            • none
            • 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 declaration
            • pause-before
            • pause-after
            2
            pause-afterSpecifies a pause after speaking an element's content
            • time
            • %
            2
            pause-beforeSpecifies a pause before speaking an element's content
            • time
            • %
            2
            pitchSpecifies the speaking voice
            • frequency
            • 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 content
            • auto
            • none
            • url
            • mix
            • repeat
            2
            richnessSpecifies the richness in the speaking voice. (Rich voice or thin voice?)
            • number
            2
            speakSpecifies whether content will render aurally
            • normal
            • 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 cell
            • always
            • once
            2
            speak-numeralSpecifies how to speak numbers
            • digits
            • continuous
            2
            speak-punctuationSpecifies how to speak punctuation characters
            • none
            • code
            2
            speech-rateSpecifies the speed of the speaking
            • number
            • x-slow
            • slow
            • medium
            • fast
            • x-fast
            • faster
            • slower 
            2
            stressSpecifies the "stress" in the speaking voice
            • number
            2
            voice-familyA prioritized list of voice family names that contain specific voices
            • specific-voice
            • generic-voice
            2
            volumeSpecifies the volume of the speaking
            • number
            • %
            • silent
            • x-soft
            • soft
            • medium
            • loud
            • x-loud 
            2
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