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This website has a section that provides you with convenient functions for selecting, navigating, and manipulating DOM elements.
This website focuses on scripts that control the HTML DOM with vanilla code, providing a nice collection of scripts that do just that.
CSS tricks have a nice collection of all sorts of code snippets, including this great list of JS snippets.
Focus on beginners and a bit dated, but this list is still a useful resource to keep in your pocket.
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