Check that getComputedStyle causes a shadow re-distribution when necessary. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS getComputedStyle(d1).color is '' PASS getComputedStyle(d2).color is green PASS getComputedStyle(d1).color is green PASS getComputedStyle(d2).color is '' PASS successfullyParsed is true TEST COMPLETE A