A muted video:
The muted attribute is supported in Internet Explorer 10, Firefox, Opera, Chrome, and Safari 6.
Note: The muted attribute of the <video> tag is not supported in Internet Explorer 9 and earlier versions.
The muted attribute is a boolean attribute.
When present, it specifies that the audio output of the video should be muted.
The <video> tag is new in HTML5.
In XHTML, attribute minimization is forbidden, and the muted attribute must be defined as <video muted="muted">.
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