link function
A <link rel=... href=...>; attributes carries integrity,
crossorigin, media, as, type...
Implementation
Element link({
required String rel,
required String href,
String? id,
String? classes,
Map<String, Object?> attributes = const {},
}) => _tag('link', const [], id, classes, {
'rel': rel,
'href': href,
...attributes,
});