Thank you Microsoft, may I have another ...

Really hate the quirky way that IE handles human-readable HTML ... it inserts unwanted padding, and has since forever. The only solution is to mash your HTML up into a hard to maintain (or read) mess, or just let it go. It does make me pull my hair out every time I need to make major revisions to the web pages.

Oh, by human-readable I mean formatting of source code as strongly recommended by Microsoft (Code Complete). Firefox, Chrome and Opera don't have any problems with it ...