Description
Requests a speaking rate of synthesized speech in words per minute. The value is give as a absolute number of words per minute, relative change, or one of "fast", "medium", "slow", "default".
Relative changes to values are specified as signed numbers with optional decimals, for example "+12.5". The change can be expressed as a percentage, e.g. "-10%".
VoiceXML browsers are not obligated to fully implement all speech markup tags, however, a compliant browser must silently ignore any tags it does not support, and should make its best efforts to map any unimplemented mark-up to something similar that is supported.
