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javascript inside CSS?

I was just wondering, what ways are there to include JavaScript inside
CSS files?

For example, if I wanted an "onhover" rule any time you hover over a DIV area, is that possible?

I noticed on one website (lost the URL, damn!) that whenever you hovered over text, it suddenly got "bigger". I was trying to understand how it worked but couldn't quite figure it out. It seemed like some of the javascript was missing from the "view source".