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21.2. volume Property

The volume property behaves much like the “volume” knob on your radio or television — it regulates the “loudness” level of the sound being played back. The aural style sheet volume property is designed to control the sound level of the speech being played over the computer's speakers. It is a very versatile property, giving Web authors complete control over sound level.

The volume property can take a wide range of values, covering the complete spectrum from near-quiet to deafening loudness. It can take a numeric value that ranges from “0” to “100,” where “0” is equivalent to near-silence, and “100” is the loudest possible sound the Web browser can produce. The volume property can also take a percentage value, where a value of “0%” is the same as near-silence (or “0”), and “100%” is full volume (or “100” in numerical terms).


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