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1.
Term used in the source code of websites, often in Style Sheets, to define the vertical space between lines of text.
In the Head section of the source code:

<STYLE> FONT { line-height: 180% } </STYLE>

In the Body section of the source code:

<FONT Style="line-height: 180%">This is a public service announcement: Buy Eggs.</FONT>
by your hair is good to eat April 19, 2005