I think it would be better to do a split panel so you could see the source and the end result side by side. This would eliminate the need for somehow showing th

I think it would be better to do a split panel so you could see the source and the end result side by side. This would eliminate the need for somehow showing the video and the source in the same place. You could even include the shadow DOM trees for a full explanation of how the browser renders complex tags like video.