Previous Video (Only works if more than one Video ID was
specified)
Go back 10 seconds
Play / Pause
Go forward 10 seconds
Next Video (Only works if more than one Video ID was
specified)
Mute / Unmute Video
Loop / Unloop Video when it ends
Jump to specified point in Video by keying in the time in
minutes and seconds and pressing ENTER. For example, you can
type 5:10 or 3.45 or 30 for 5 minutes
10 seconds, 3 minutes 45 seconds and 30 seconds
respectively.
Size refers to playback quality size as reported by YouTube.
Examples include 1080 or 720.
Display timer shows elapsed time followed by total video
length. If this is a live stream, then video length refers
to the duration since the live stream started.
Progress bars display the current position of the video
playback in orange, and the buffered position in light
orange. When the video has played past key points (25%, 50%,
75%, etc), the percentage will be displayed inside the
progress bar.
Toggling the debug will display debugging messages,
especially for embeded browsers that do not have easy access
to the console.