Unlike 'touchend' or 'click', the 'wheel' event (both on 'element' or 'window') doesn't seem to be a valid interaction event to unmute autoplay video. Instead, the video is stopped. Demo: https://codepen.io/woutervroege/pen/MVgoQO
<rdar://problem/38289973>
When we talked about this on twitter <https://twitter.com/woutervroege/status/971483683415830534>, I misunderstood your question. I thought you were saying that "wheel" doesn't seem like it _should_ be a valid interaction event, implying that the bug was that we _were_ allowing it to be used to unmute autoplaying video. Actually, I don't believe "wheel" should be a valid user interaction event. If it were, then users with mouse-wheels could have their videos un-mute when they were only trying to scroll the page. In this case, it's similar to the distinction between "touchstart" and "touchend". "touchstart" will be fired at the start of a scroll gesture, but "touchend" will never be fired when the user goes on to scroll the page, so it's safe to use as a user gesture.