chromium/third_party/blink/web_tests/css3/selectors3/xml/css3-modsel-95.css

@namespace a url(http://www.example.org/a);
@namespace b url(http://www.example.org/b);
div.test * { background-color : red ; display : block ; margin-bottom : 1em }
div.test *|* { background-color : lime }