From http://www.w3schools.com (Copyright Refsnes Data)
The speech-rate property is used only in Aural Stylesheets.
The aural rendering of a document combines sounds and voices to go through the content of a document. Aural presentation occurs often by converting the document to plain text and then feeding this to a screen reader.
Situations and markets for listening to information could be:
The speech-rate property specifies how fast the text should be read - the speaking rate.
| Value | Description |
|---|---|
| number | A number that specifies the speaking rate in words per minute |
| x-slow | 80 words per minute |
| slow | 120 words per minute |
| medium | Default. 180-200 words per minute |
| fast | 300 words per minute |
| x-fast | 500 words per minute |
| faster | Current speech-rate + 40 |
| slower | Current speech-rate - 40 |
From http://www.w3schools.com (Copyright Refsnes Data)