Ian Hickson tests, tests * { display: block; color: green; } testA[|attribute] { color: red; } testB[|attribute="fail"] { color: red; } testC[|attribute~="fail"] { color: red; } testD[|attribute^="fail"] { color: red; } testE[|attribute*="fail"] { color: red; } testF[|attribute$="fail"] { color: red; } testG[|attribute|="fail"] { color: red; } This should be green. This should be green. This should be green. This should be green. This should be green. This should be green. This should be green.