Please see below for a (real) demo. All the code is in this repo! Cheers.
<script data-goatcounter="https://sagittarius.goatcounter.com/count" async src="//gc.zgo.at/count.js"></script> <iframe width="100%" height="515" src="https://www.youtube.com/embed/__nL7Vc0OCg?si=tReedrTnNuSBFHXs" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>Made by Greg Technology.