Videos run automatically. When slider starts to move the video controls will start working (the controls are unresponsive while the full video loads).
Spacebar toggles play/pause. Right and left arrow keys advance and rewind 3 s. The frame review pages are 3 s duration. Pausing the video and using the right and left arrow keys allows for convenient review. Holding right and left arrow keys acts as a fast-forward and fast-rewind, not showing each frame.
Up arrow pauses video and rewinds by 1 frame. Down arrow pauses video and advances by 1 frame. Holding down an up or down arrow acts as a fast-rewind / fast-forward.
Entering fullscreen replaces the keyboard and on-screen controls with those native to your browser.