title: How to disable the esc key , F11, and popup from exiting fullscreen mode in php?
body: <p>How to disable the <kbd>Esc</kbd> key in the keyboard from exiting the fullscreen mode in a page? Also how to disable the <kbd>F11</kbd> key and also remove the popup message showing "exit fullscreen"?</p>
  
  <p>Actually i m doing a online bank examination. When a candidate is writing an exam, he should not be able to press <kbd>Esc</kbd> key, click on the popup, or press <kbd>F11</kbd> ?</p>