ESC                          Toggle READONLY and Go INSIDE TEXTAREA
` (Backquote/Backtick)       Toggle Text to Video (Seek Up) Link

INSIDE TEXTAREA:
  Shift Space                Pause / Play
  Shift Backspace            change EDL / xxx status
  Shift -/+/0                Decrease/Increase/Reset Video size
  CLICK on line              set video position to cursor's (interpolate from IN OUT)
  UP/DOWN                    same as above

  READONLY - additional keys available:
    SPACE                    Pause / Play
    Backspace                change EDL / xxx status
    Enter                    same as CLICK, set video position to cursor's
    s                         
    i, o

OUTSIDE:
  Space                      Pause / Play
  k                          Pause / Play
  l                          Play
  Backspace                  change EDL / xxx status
  Shift Backspace            change EDL / xxx status
  s                          Playhead to EDL line seeking (Video -> Text)
  i                          Mark IN point. Add as a new line at bottom
  o                          Mark OUT point. Overwrite the out point of the last line
  Ctrl-S / CMD-S             Save to local browser cache.
  ?                            Show/Hide Help