Originally Posted by Jellby
Percents and ems are only equivalent when they're used in font sizes (or in line-height, I believe). In margins, indents, widths, etc. they are two very different things. Percent values are measured relative to the container block's width (generally), while ems are referred to the current font size.
Hmm I see. Thank you for the clarification... Guess I should have read those wikis more closely as well.