| http://www.w3.org/ns/prov#value | - ily musical expression such as singing or rapping, at least one of the following is true: (Level AAA) No Background: The audio does not contain background sounds.Turn Off: The background sounds can be turned off.20 dB: The background sounds are at least 20 decibels lower than the foreground speech content, with the exception of occasional sounds that last for only one or two seconds.Note: Per the
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