Jazzyforcefield

Webpage duplicates slider when pressing save/load history in quick succession

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**What Course are you in** CSCI 4131 **What Page were you on** https://runestone.academy/runestone/books/published/webfundamentals/Javascript/asyncJavascript.html **What is your username** ungxx028 **Describe the bug** Upon reading that the page makes use of Promise.all...