It doesn't seem to work for me. There are no JavaScript errors in the console* but the <button> that says "test your clicking speed" doesn't even have an event attached to it. Hovering over anything for multiple seconds doesn't fire any requests in the network panel.

Anyone else having this issue?

* Well, there's this, but I assume it's not dependent on google... `Loading failed for the <script> with source “hxxps://www.googletagmanager.com/gtag/js?id=UA-134140884-1"`