I can officially chalk this one up in the “I did not know that” category — and continue to be amazed by Eric Meyer’s CSS knowledge. He can explain it better than I, but to simplify you do not need to include a unit of measure when declaring line-height. Let’s say you have set the line-height to n for a paragraph. With no unit of measure attached to that value, the n acts as a multiplier on the declared font-size to build the correct line-height .

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