How to export a Godot 4 game to run on the web on itch.io

On the Go Godot Jam 4 Discord I just saw some people having issues with how to get HTML5 exports from Godot 4 to work on itch.io, and since I just had to do this for my own game submission to the jam as well I decided to jot my steps down here (and on the Discord too) as it seems to be a bit of a pain for people.

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How to export a Godot 4 game to run on the web on itch.io