This is neat, and immediately made me think of the annotations that show up when you hit the play button on https://lowerquality.com/gentle/ https://lowerqualit

This is neat, and immediately made me think of the annotations that show up when you hit the play button on https://lowerquality.com/gentle/ https://lowerquality.com/gentle/ , but it turns out those are made with absolutely-positioned divs and a lot of offline-precalculated px math.