YouTube keyboard shortcuts?

Question

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?

Answer 1

It's at the bottom of the Screen reader support page:

Keyboard shortcut           Function
------------------------------------
O                           To jump to the beginning of the flash player

Spacebar                    Play/Pause when the seek bar is selected.
                            Activate a button if a button has focus

Play/Pause Media Key
on keyboards                Play / Pause

Stop Media Key
on keyboards                Stop

Next Track Media Key
on keyboards                Moves to the next track in a play/list

Left/Right arrow on
the seek bar                Seek backward/forward 5 seconds

Ctrl+left/ctrl+right
arrow on the seek bar       Seek backward/forward 10 seconds

Home/End on the seek bar    Seek to the beginning/last seconds of the video

Up/Down arrow on the
seek 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 video

Number 0
(not on the numeric pad)
on the seek bar             Seek to the beginning of the video

Indeed it's very hard to find. They ought to make a dedicated page for this.

Answer 2

In addition to Zom-B's answer,

Keyboard shortcut           Function
------------------------------------------------
J                           12 seconds backwards
K                           Pause / Play
L                           12 seconds forward

Source.

Answer 3

In addition to other answers:

Keyboard shortcut           Function
------------------------------------------------
M                           Mute / Unmute

Answer 4

Keyboard shortcut           Function
------------------------------------------------ 
Pause then Left/Right       Framestep

Answer 5

In addition to other answers:

Keyboard shortcut           Function
------------------------------------------------
Left followed by Up         Snake game :o)

Answer 6

Keyboard shortcut           Function
------------------------------------------------
F                           full screen