[title] {}
[title=foo] {}
[title="foo"] {}
[ title = "foo" ] {}
[   title   =   "foo"   ] {}
[lang~="en-us"] {}
[lang|="zh"] {}
[href^="#"] {}
[href$=".org"] {}
[href*="example"] {}
[href*="insensitive" i] {}
[href*="insensitive" I] {}
[href*="cAsE" s] {}
[href*="cAsE" S] {}
[foo|att=val] {}
[*|att] {}
[   *|att   ] {}
[|att] {}
[ |att ] {}
[   |att   ] {}
[att] {}
[ att ] {}
[   att   ] {}
a[ class = "test" ] {}
a[   class   =   "test"   ] {}
[href*="insensitive"   i] {}
[   href*="insensitive"   i   ] {}
[   href   *=   "insensitive"   i   ] {}
[   href   ] {}
[frame=hsides i] {}
[🐈] {}
[🐈=🐈] {}
[🐈|🐈=🐈] {}
[frame=hsides I] {}
[href*="cAsE" S] {}
