[css-speech-1] Useful values to drive TTS engines #13402
Description
As the goal of CSS Speech is to override default TTS engines behavior / values, one could ask why define normal, medium, and auto values? To define default/initial values and to block the inheritance of undesired custom values I suppose.
If yes, it could be interesting to mention it, when defining these three values, and to point, in each definition, to the concepts of inheritance and defaulting, as defined by CSS Cascading and Inheritance Level 4.
As matter of fact, all specialists of aural rendering are not CSS specialists. They may be puzzled by these values (as I was on first reading). Cascading is the most difficult part of CSS for people who have no experience in object programming.
normal is a value for:
- speak-as
- voice-stress
- voice-rate
medium is a value for:
- voice-pitch
- voice-range
- voice-rate
- voice-volume
- pause-before
- pause-after
- pause
- rest-before
- rest-after
- rest
auto is a value for:
- speak
- voice-duration