Charles, when you make CSS for webpage and you use em values instead of pixels, it's quite difficult to remember real (pixel) values, because of em's nature.
body - you set font-size as 1em and it's 16px within that body you have div#header and you set font-size to 0.5em and that's 8px within #header you have paragraph and you set font-size to 1em, but it's not 16px. It's 8px. That's why I need a tree. This tool is used by many people as I can tell from incoming links, save count at del.icio.us and many mails. More importantly - I created it beacuse I was tired of calculating this stuff by myself and taking notes on paper. ;) You should read about em values if you don't know why they're important :) I guess I'll have to rewrite this tool to plain DOM methods again. Or at least this frickin' node addition. :) -- Piotr Petrus http://riddle.pl
