These are copied from the page:
https://sites.google.com/a/umich.edu/u-m-google-170816/accessibility/google-keyboard-shortcuts---youtube
| Action | Shortcut |
|---|---|
| Toggle play/pause the video |
k or Spacebar |
| Go back 5 seconds |
Left arrow |
| Go back 10 seconds |
j |
| Go forward 5 seconds |
Right arrow |
| Go forward 10 seconds |
l |
| Skip to a particular section of the video (e.g., 5 goes to the video midpoint) |
Numbers 1-9 (not the keypad numbers) |
| Restart video |
0 (not the keypad number) |
| Go to Full Screen mode | f |
| Exit Full Screen mode |
Escape |
| Go to beginning of video |
Home |
| Go to end of video |
End |
| Increase volume 5% |
Up arrow |
| Decrease volume 5% |
Down arrow |
| Increase speed |
Shift+> (may not work in all browsers) or Shift+. (period) |
| Decrease speed |
Shift+< (may not work in all browsers) or Shift+, (comma) |
| Move forward 1 frame when video is paused | . (period) |
| Move backward 1 frame when video is paused | , (comma) |
| Mute/unmute video | m |
| Turn captions on/off | c |
| Cycle through options for caption background color | b |
| Move to the previous video in a playlist | Shift+p |
| Move to the next video in a playlist | Shift+n |
