Videos autoplaying on safari

We are facing an unexpected behaviour running on safari browser. We have loaded videos, not playing. Then we navigate to another page and go back to the page where the video is, and the video starts autoplaying. The weird thing is that the `controller.isplaying` value is false.

Start by reproducing the issue in Safari: load a video, navigate away, return, and compare the visible playback state with controller.isPlaying. Trace the video-player lifecycle and autoplay handling around page navigation; done means a video that was paused remains paused when revisiting the page and the controller state matches its actual playback.

Written by the indexing model from the issue text.