A fascinating thing has happened in the world of JavaScript DOM traversal: Over the course of a couple months in 2007 three of the major JavaScript libraries (Prototype, Dojo, and Mootools) all switched their CSS selector engines to using the browser's native XPath functionality, …

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Over the past couple years we've heard a lot about separation. Two types, in particular, have been evangelized, data from structure and structure from style. One we don't hear about nor see it practiced very often is separation between structure and behavior.

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