Quote:
Originally Posted by DNSB
If the line height is set with a unit (em, cm, px, pt, etc.), it becomes an absolute value regardless of the font size so you get to see large font sizes overlap and small font sizes look lonely in a sea of white space.
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While I agree with the rest of your message, I have to point out that "em" does not belong on that list, being a relative rather than absolute unit. It's still a good rule of thumb to say "no units on line-height," but ems
should be okay due to their relative nature.