[ASTP001]

Your code did not work for me, here is what worked:

javascript:(function(){audio=document.createElement('audio');audio.controls=true;audio.autoplay=true;audio.src='https://per.quest/'+document.location.href;

audio.style='position:fixed;right:0;top:0;height:revert;z-index:10000;';document.body.appendChild(audio);})();

[darkstar999]

I also had to engage in an arms race with z-index:999999 to keep it above a website's sticky header.