The richness property is used in CSS with audio sounds. This property specifies the richness, or brightness, of the speaking voice. Higher values of richness/brightness have rougher waveforms and tend to carry better than lower richness values with smoother waveforms ("smooth" as in when the waves are drawn, not heard). Before its inclusion in CSS2, this property was first proposed in the W3C Working Draft "Aural Cascading Style Sheets (ACSS)" (1/7/97,


Value Description
inherit Explicitly sets the value of this property to that of the parent.
<number> This is an integer value between 0 and 100 representing the brightness of the voice. Higher values indicate a brighter voice while lower values create a softer voice. The initial value is 50.

CSS example:

body {
      richness: 75;

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