Specify the attribute of the <link> tag that is us

Specify the attribute of the tag that is used to reference the external style sheet.

stylesheet
href
text/css
alternate

Explanation

The <link> tag makes a link between web document and external resources (mostly CSS external style sheets).
Supported in all major browsers.
Typical form of use is:
<link rel="stylesheet" type="text/css" href="mystylesheet.css">
href specifies the place of location of the linked file.