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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.

The Google Chart API returns a chart image in response to a URL GET or POST request. The API can generate many kinds of charts, from pie or line charts to QR codes and formulas. All the information about the chart that you want, such as chart data, size, colors, and labels, are part of the URL. (For POST requests, it's a little different, but don't worry about that now).