Mouse Lock Example

- Lock mouse:
  - left click in either of the two boxes; or
  - right click in either of the boxes to ensure that it is focused and then press Enter key. (You could verify that the tooltip window is dismissed properly by this second approach.)
- Unlock mouse voluntarily:
  - press Enter.
- Unlock mouse involuntarily:
  - lose focus; or
  - press Esc key; or
  - exit from "tab fullscreen"/"browser fullscreen"/"Flash fullscreen".
    - "tab fullscreen" refers to when a tab enters fullscreen mode via the JS or Pepper fullscreen API;
    - "browser fullscreen" refers to the user putting the browser itself into fullscreen mode from the UI (e.g., pressing F11).
    - "Flash fullscreen" refers to the fullscreen mode used by Pepper Flash. You could enter Flash fullscreen by pressing 'f' key when either of the boxes is focused, and exit by pressing Esc key.