17th October 2007, 10:28 PM
Because a PDF is an exact image of the page... HTML changes the formatting and stuff. But the format is just so awful... you can't scroll normally, because of how ridiculously slowly it scrolls, so you have to either use the page up/page down keys (which aren't perfect, but are faster than scrolling line by line) or tediously scroll it line by line... either way reading PDFs is a pain.