chromium/src/third_party/blink/web_tests/css3/selectors3/xml/css3-modsel-15b.css

p { background: green; color: white; }
#test#fail { background: red; color: yellow; }
#fail#test { background: red; color: yellow; }
#fail { background: red; color: yellow; }
div { background: red; color: yellow; }
#pass#pass { background: green; color: white; }