Focusing on a button that opens a modal and holding down Enter causes multiple backdrops

Created by: DannyJJK

This is easiest to replicate on Firefox but it can be replicated on Chrome if you click the button then quickly hold down enter. Focusing on the button and holding down enter causes the modal dialog to be quickly opened and closed repeatedly as expected, however the background of the modal doesn't disappear correctly, and if you use the default transparent dark background, it turns into a black color because of how many additional backgrounds appear. Sometimes the modal becomes unclosable as well (clicking the X does nothing). I assume this is a setTimeout issue.