media specifies the intended destination medium for style information.
medium = stylesheet.media stylesheet.media = medium
medium
is a string describing a single medium or a comma-separated list.<link rel="StyleSheet" href="document.css" type="text/css" media="screen" />
The default value for media is "screen."
DOM Level 2 Styles - STYLESHEET
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https://developer.mozilla.org/en-US/docs/Web/API/StyleSheet/media