Building a Simple CSS Selector Engine - NetTuts+
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Genre: Video Training

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Recently, I thought I d try my hand at creating a simple CSS selector engine. You know what I m talking about: it s the kind of thing you use in most javascript libraries, where you pass in a CSS selector to find the elements you want to work with. Today, I ll show you how to create a really simple one!
What we are going to be building today is in no way something you d use on a live site. It will not have all the great features you re used to using in the  real  selector engines, but it will give you a small taste of how complicated something like Sizzle or NWMatcher can be. And who knows? Maybe you ll pick up a few javascript tips and tricks on the way.