I'm sure in the past it did work. using the modal popup for a youtube video, the video started automatically to play when the modal window opened.
I can also see in the code the autoplay parameter is set.
<iframe class="mfp-iframe" src="//www.youtube.com/embed/dydRS9u76qg?autoplay=1&rel="0"" frameborder="0" allowfullscreen=""></iframe>
Here is a Page for testing: (i have the same issue on all my sites)
https://conzept.robilau.com/
Any Idea how to fix please?
Joomla 5.2.2
SPBB 5.4.2
Helix 3