CSS: font-size and the height a font really spans [closed]

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padding : 3px 3px;
height : 1em;

it seems actu开发者_C百科al padding-bottom is less than 3px

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True.

When you set the height property, the padding-bottom gets lost.

Demo: http://jsfiddle.net/a99yV/

Also, this may help you to better understand this behavior http://jsfiddle.net/a99yV/1/