A muted audio:
The muted attribute is supported in Internet Explorer 10, Firefox, and Opera.
Note: Internet Explorer 9 and earlier versions, do not support the muted attribute.
The muted attribute is a boolean attribute.
When present, it specifies that the audio output should be muted.
The <audio> tag is new in HTML5.
In XHTML, attribute minimization is forbidden, and the muted attribute must be defined as <audio muted="muted">.
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