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https://www.w3schools.com/js/js_htmldom_animate.asp
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https://inpa.tistory.com/entry/JS-%F0%9F%93%9A-BOM-%EB%B8%8C%EB%9D%BC%EC%9A%B0%EC%A0%80-%EA%B0%9D%EC%B2%B4-%EB%AA%A8%EB%8D%B8
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