- balance (between channels or speakers)
- sounds that provide cues before and/or after specific elements
- voice characteristics (e.g., type of voice, rate of speech, pitch, emphasis, time taken to speak text)
- phonetic pronunciation
Right now, alternative browsers use the elements within the HTML/XHTML/XML documents themselves to provide indications of how to speak the text. With these CSS properties, your ability as a web author will be enhanced by providing not only the words, but also control over how they are spoken.
Keep tuned . . .