.foo foo-foo {
  onefoothree: foo;
  string: hellofoogoodbye;
  string-single: 'he\'llofoogood"bye';
  string-double: "he\"llofoogood'bye";
  url: url(hellofoogoodbye);
  url-single: url('he\'llofoogood"bye');
  url-double: url("he\"llofoogood'bye");
  nested: "type-of(foo) bar";
}