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https://www.w3.org/TR/CSS21/aural.html

This chapter is informative. UAs are not required to implement the properties of this chapter in order to conform to CSS 2.1. We expect that in a future level of CSS there will be new properties and values defined for speech output. Therefore CSS 2.1 reserves the 'speech' media t…

https://www.w3.org/TR/CSS2/aural.html

Aural style sheets previous next contents properties index Appendix A. Aural style sheets Contents A.1 The media types 'aural' and 'speech' A.2 Introduction to aural style sheets A.2.1 Angles A.2.2 Times A.2.3 Frequencies A.3 Volume properties: 'volume' A.4 Speaking properties: '…