Giving side by side div same height

I believe that anybody that was involved in developing website at least once, was wondering how you could give two or more DIV containers the same height. Usually this problem occurs if you cannot or do not want to give those containers their height in absolute pixel values. Obviously, there are different approaches for a column layout to achieve this. One of them being the Faux-Column-Technique that uses a vertically repeated background image.

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