Firefox 2.x, Firefox 3, Opera 9.26, Opera 9.50, Safari 3.0.4, Konqueror 3.5.2, Hv3 TKHTML alpha 16, Amaya 10.0.1, Seamonkey 1.x, Seamonkey 2.x, NS 7.2, K-meleon 1.x, Galeon 2.0.2, Epiphany 2.20 all pass this test.
Credit must go to Sjaak Priester for discovering and reporting this bug.