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

[Jazzyforcefield]

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 and disables the save button when history is loading, I decided to test it out and was still able to press the button and produce many sliders.

Traceback N/A

Additional context I was also able to reproduce this by clicking the history button fast and by clicking the save button fast. I am guessing that it does that when either of the buttons are clicked in rapid succession, for example you could click two of one, or both buttons in quick succession.

[bnmnetp]

First, Congratulations! You are one wicked fast clicker.

Second, you got me! I don't think you could recreate this same bug for a python program, but I do see the problem for Javascript and html (I don't use Promise.all for those cases 😢 ) Thanks for pointing this out!