bramus/mixed-content-scan — pull request #1 by mathiasbynens (2014-12-10 15:21:39+00:00)
Title: Support `<link rel=stylesheet href=foo>`

The `type=text/css` attribute/value part can safely be omitted in HTML:
https://mathiasbynens.be/notes/html5-levels#type-attributes

But the scanner should not skip such elements.