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I’m sure you’ve heard of unobtrusive JavaScript before. But do you use it? I admit that in my early days I hadn’t and only started to once I began using Mootools. It is possible to create unobtrusive JavaScript without a library, but you’re better off using something like DOM Assistant if you’re not already using a library. Even with all the modules, it’s only 10 kb compressed. That should allow you to easily do all the things you could with a full-fledged library. It the examples below, I’ll be using Mootools. Look for equivalents for your library.