The following 2 sentences should be using the same font size.

This bug will occur in MSIE 7 even if the MSIE 7 user has the Tools/Internet Options.../Advanced tab/Accessibility section/Always expand ALT text for images checkbox checked and even if the MSIE 7 user has the Tools/Internet Options.../Advanced tab/Multimedia section/Show pictures checkbox unchecked. So, this is really and truly an HTML 4.01 spec. violation.
This was also reported at Ian "Hixie" Hickson evil tests website in January 1999: The alternative text of the IMG element
Firefox 2.0.0.4, Opera 9.21, Konqueror 3.5.8, Amaya 9.55, Seamonkey 1.x, Seamonkey 2.x, NS 6.2, NS 7.0, NS 7.2, K-meleon 1.x, Galeon 2, Epiphany 2 all pass this test.