The following 2 sentences should be using the same font size.
This bug will occur in MSIE 7 and in MSIE 8 even if the Internet Explorer user has the Tools/Internet Options.../Advanced tab/Accessibility section/Always expand ALT text for images checkbox checked and even if the Internet Explorer user has the Tools/Internet Options.../Advanced tab/Multimedia section/Show pictures checkbox unchecked.
If alternate text is to be rendered as inline, then it should inherit from its parent the inheritable property values, including font-size.
This was also reported at Ian "Hixie" Hickson evil tests website in January 1999: The alternative text of the IMG element
Firefox 188.8.131.52, Firefox 3.0.7, 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.