url(foo); "foo)"; "foo'"; 'foo"'; "foo\""; 'foo\''; url("foo)"); url("foo'"); url('foo"'); url("foo\""); url('foo\''); .blah #foo /********/ html { color: green; } U+2022-2023 U+??33-40fa U+x U+01234599 U+??????-000012f 0.575 .825 15 20% .05% 0.1% 0.% 5em .5em 0.4px .% \.moo\se {} bla\2022 f {} @import url('foo.css'); @\hello; @.bad {} body { font-family: "Bitstream Vera Sans"; } body { font-family: "foo \ bar"; } /** */ body { font-family: "unterminated string foo } blah { baz: bat; foo: bar !important; } foo { bar: ""; }{ color: green; }