Original Source: http://feedproxy.google.com/~r/1stwebdesigner/~3/vFCNSyyCZSg/
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This website has a section that provides you with handy functions for selecting, traversing, and manipulating DOM elements.
CSS Tricks has a nice collection of all different kinds of code snippets, including this great list of JS snippets.
Focusing on beginners, and a bit dated, but this list is still a worthwhile resource to keep in your back pocket.