Slide In Image Captions

Reader Jason Lucchesi send me in a neat demo of image captions sliding in overtop an image on rollover. The effect used a bunch of nested divs to get it done, so I thought I'd do my own version of it using the standard HTML5 structure for an image with a caption, and CSS3 it up.

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Why do something like this at all? Perhaps saving space in a layout. Perhaps the…