meta function
A <meta>: meta(name: 'description', content: '...'), or any other
form through attributes ({'property': 'og:title', 'content': ...}).
Implementation
Element meta({
String? name,
String? content,
String? id,
String? classes,
Map<String, Object?> attributes = const {},
}) => _tag('meta', const [], id, classes, {
'name': name,
'content': content,
...attributes,
});