Image with a text overlay that is dynamically generated

I want to display an image with a title that lays on top of the image. This title should be dynamically generated, therefore no photo editing tool can be used in this situation. The text comes from a dynamically generated JSON object, which then can be used by a JavaScript in order to inject the title information into a website. The only technologies that can here be used is web technologies such as XHTML and CSS.
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