This bug was originally reported at eggheadcafe's post Bug: IE8 Standards Mode Float Mode on december 29th 2009
"The -ms vendor prefix explicitly marks the property as proprietary to Microsoft. By delimiting the entire value as a string [with balanced delimiter quote pairs], grammatical delimiter issues are avoided. (...) The -ms prefix in your static style rules is something we recommend not just to be a good standard citizen but because it is the forward-looking thing to do in your future stylesheets."
Using Filters In IE8, Sylvain Galineau [MSFT]
Firefox 3.6, Opera 10.10, Safari 4.0.4, Konqueror 4.3.4 and Seamonkey 2.x pass this test.