This page does have margins specified on it. So, the text wraps to 20 pixels from the edge and top of the browser window. To see what NO margins look like click here.
Netscape uses the MARGINWIDTH, and MARGINHEIGHT commands to specify it's margin settings.
While Internet Explorer uses the LEFTMARGIN, and TOPMARGIN commands to specify it's margins settings.
Please keep this in mind when writing pages for your viewers.