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Absolutely nothing happens when I hover over an element after clicking "Try it yourself on this page".

Ditto. If I click on that element I get a black box with a few icons in it, but no actual information.

Safari 14.0 on macOS 10.15.16

I use Safari.

It works for me on osx firefox. Here is what it looks like https://imgur.com/a/UjX0Bug