CSS SPEECH-RATE

This property specifies the speaking rate (speed) of the content.

Example
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strong {
  speech-rate: fast
}
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<strong style="speech-rate: fast">text</strong>

Possible Values

inherit: Explicitly sets the value of this property to that of the parent.

x-slow, slow, medium, fast, x-fast: x-slow: 80 words per minute, slow: 120 words per minute, medium: 180 – 200 words per minute, fast: 300 words per minute, x-fast: 500 words per minute

slower, faster: slower: Subtracts 40 words per minute from the current speech-rate. faster: Adds 40 words per minute to the current speech-rate

[number]: Positive number indicating speech-rate in words per minute.