I was building a new webpage with divs, and tried to make all with a percentage, so the page would be screenfilling on all resolutions.But what I encountered was that IE didn't support height % for those divs, the source was working properly in FF, but in IE, it didn't work. So I fixed it with a hard height option. (setting pixels for height). Maybe it's good to show this (bug??) in the .CSS tutorial.