An HTML comment before the doctype declaration will trigger Internet Explorer 7 and Internet Explorer 8 into backward-compatible "quirks" rendering mode when it should not do so.

Live (actual) result in your browser:

Test passes if there is a filled green square and no red.

Firefox 1.5, Firefox 2.x, Firefox 3.0.4, Opera 9.62, Safari 3.2, Safari 4.0, Konqueror 3.5.10, Konqueror 4.1.1, Hv3 TKHTML alpha 16, Amaya 10.0.1, Seamonkey 1.x, Seamonkey 2.x, NS 7.2, K-meleon 1.x, Galeon 2.0.7, Epiphany 2.22 all pass this test.

This bug has been reported at connect's IE beta feedback as bug 382800. This bug has been closed by the IE team and will not be fixed for the release of IE 8 final.