Web Reference: This addresses the annoying problem that you often want to locate DOM elements by id, but then you have that nagging feeling that you're supposed to make all id s unique across the entire document, so id effectively becomes a global variable that you can't modularize. HTML element IDs are accessible as global variables on the window object. So, should we stop using `getElementById ()` and `querySelector ()`? Nothing in the video is wrong, you shouldn't ever use them just to get a global variable, and you shouldn't use them in situations where a class would work just as well.
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