Youtube iframe “loop” doesn't work

Question

I tried to use the YouTube player demo to generate the code necessary for my video to autoplay and loop itself. But only the autoplay works, it doesn\'t loop, and the demo-v

Answer 1

Accepted answer didn't work for me either. Working workaround for September 2018 (bonus: set width and height by CSS for #yt-wrap instead of hard-coding it in JS):