title: (jquery) Blackout the entire screen and highlight a section of the page?
body: <p>As per screenshot below. I am pretty sure someone has done this before! =)</p>
  
  <p>The circle is a bonus, would be very happy with a solution that allows highlighting of a given "div"</p>
  
  <p><img src="https://i.stack.imgur.com/pdfr4.png" alt="only part of the screen highlighted"></p>