OK, wanna see something weird?
line-height: 100%;
You'd think this sets the line height to its default value. You'd be
wrong. As best as I can tell, the default hight (for Firefox) is 120%.
And, as far as I can tell from the W3C spec, this default value is
allowed to vary arbitrarily for each browser.
Yay, that's useful! :-/
