YouTube Auto-Play Test Guide: Home

Original code for playlist:

<iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?si=Nbn92ZJu0cgzG-4q&amp;list=PLAktzCwY3LvJ_leIz7AHLZZx1qGJ0-gKD" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

https://support.google.com/youtube/answer/171780?hl=en#zippy=%2Cmake-an-embedded-video-play-automatically

Where to add this to allow auto-play?

 &autoplay=1