Ian Hickson p { background: green; color: white; } .t1:not(.t2) { background: red; color: yellow; } :not(.t2).t1 { background: red; color: yellow; } .t2:not(.t1) { background: red; color: yellow; } :not(.t1).t2 { background: red; color: yellow; }


  This line should be green.