Misuse of commas in font shorthand declarations are honored instead of leading to appropriate rejection of involved CSS rules in Internet Explorer 7 and Internet Explorer 8 beta 2

This sentence should be using a serif font (like Times New Roman) with a font-size of 16px.

This sentence should be using a serif font (like Times New Roman) with a font-size of 16px.

The CSS validator will report a parsing error for each of the 2 above tested sentences.

Firefox 3.5, Opera 9.52, Safari 3.1.2, Safari 4.0, Konqueror 4.1, Hv3 TKHTML alpha 16, Seamonkey 2.0a1pre (rv: 1.9.1b1pre) all pass these 2 tests.

Update: This bug has been FIXED in Internet Explorer 8 Partner pre-RC1 build 6001.18343 released on December 11th 2008. Otherwise, Internet Explorer 8 Partner pre-RC1 build 6001.18343 PASSES this specific and particular testcase.