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Use Picture-in-Picture API for floating preview window
The preview window isn't visible on mobile unless the user scrolls down all the way to the bottom of the page. One possible solution would be to add a button to 'pop-out' the preview into a floating window using the Picture-in-Picture API.
https://developers.google.com/web/updates/2018/10/watch-video-using-picture-in-picture
I'm not sure if it's possible to request a PiP for an image element.
https://www.chromestatus.com/features/4844605453369344