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4.6 CSS2 UnitsIn addition to what we've covered in CSS2.1, CSS2 contains a few extra units, all of which are concerned with aural style sheets (employed by those browsers that are capable of speech). These units were not included in CSS2.1, but since they may be part of future versions of CSS, we'll briefly discuss them here:
The only user agent known to support any of these values at this writing is Emacspeak, an aural style sheets implementation. See Chapter 14 for details on aural styles. In addition to these values, there is also an old friend with a new name. A URI is a Uniform Resource Identifier, which is sort of another name for a Uniform Resource Locator (URL). Both the CSS2 and CSS2.1 specifications require that URIs be declared with the form url(...), so there is no practical change. |
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