I just found out if you type j when watching a YouTube video, it lapses back about 10-20 seconds, depending on the video, I think. I Googled for YouTube keyboard shortcuts but couldn't find a page explaining them. What are the keyboard shortcuts when using YouTube?
YouTube keyboard shortcuts?
youtube
It's at the bottom of the Screen reader support page:Keyboard shortcut           Function------------------------------------O                           To jump to the beginning of the flash playerSpacebar                    Play/Pause when the seek bar is selected.                            Activate a button if a button has focusPlay/Pause Media Keyon keyboards                Play / PauseStop Media Keyon keyboards                StopNext Track Media Keyon keyboards                Moves to the next track in a play/listLeft/Right arrow onthe seek bar                Seek backward/forward 5 secondsCtrl+left/ctrl+rightarrow on the seek bar       Seek backward/forward 10 secondsHome/End on the seek bar    Seek to the beginning/last seconds of the videoUp/Down arrow on theseek bar                    Increase/Decrease volume 5%Numbers 1 to 9(not on the numeric pad)on the seek bar             Seek to the 10% to 90% of the videoNumber 0(not on the numeric pad)on the seek bar             Seek to the beginning of the videoIndeed it's very hard to find. They ought to make a dedicated page for this.