It's called a sprite: Google uses one too, as it reduces the size of the served content: To make it work properly, you clip the background image so that only a little part shows: #foo { background-image: url('bar. Png'); background-position: 0px 0px; } And on :hover, you shift it over a bit: #foo:hover { background-position: 70px 0px; }.
As piskvor mentions this technique is often termed "CSS sprites": div { background-image:; background-position:0px 0px; } div:hover { background-image:; background-position:0px 50px; } The trick is to have an image with both states in it. Then make the div just large enough for only one of the states. On :hover you change which portion of the image is visible by altering the background-position value.
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