CSS PITCH-RANGE

Meaning and emphasis is created in most languages by varying the pitch and inflection of the voice. This property specifies the degree of variation from the average pitch of the voice being used to render the content. A voice with a small pitch-range will sound monotone, while a voice with high pitch range values will sound very animated.

Example
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strong {
  pitch-range: 80
}
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<strong style="pitch-range: 80">content</strong>

Possible Values

inherit: Explicitly sets the value of this property to that of the parent.
[number]: An integer between ’0′ and ’100′. A value of ’0′ produces a monotone voice, while ’50′ would produce a normal inflection. Pitch ranges greater than 50 create animated voices.