I have no idea how to use (iPhone, iOS 15.6.1). There is a pink background and a black box saying outside virtual PC, and a few keyboard/mouse shortcuts (which doesn't apply as I'm on mobile)?
I'm guessing that other visitors get some content instead of the black box...
Still, only a black rectangle is shown (also disabled ad blocker).
There are a couple of _warning_ messages in the dev console though, which might explain the origin of the issue:
> An AudioContext was prevented from starting automatically. It must be created or resumed after a user gesture on the page.
> Autoplay is only allowed when approved by the user, the site is activated by the user, or media is muted.