Pop-Up List in List

[XlosVSM]

I contribute to Pedal Playground and want to be able to make a pop-up list if I hover over an item in a list. List-ception.

Something similar to this: https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_ref_js_dropdown_multilevel_css

[CWarford]

I would be happy to assist you in this task for Hacktoberfest or any other of your needs if it is applicable. Thanks