Text in Safari on windows appears extreamly fat, setting text-shadow: 0 0 0 #fff; fixes this so i belive text-shadow is some how always on by default. Some text is very hard to read with out setting this value first.
*** This bug has been marked as a duplicate of 14196 ***
The cause of this is that the AA is switched from ClearType to Standard when ever a shadow is applyed, probably because Core Graphics has issues rendering fonts on shadows, still the bug remains, ill change the topic to a correct one though.
Created attachment 17152 [details] No shadow normal ClearType rendering.
Created attachment 17153 [details] Shadow applyed Standard AA used