title: highlight a DOM element on mouse over, like inspect does
body: <p>We have a bookmarklet, and the user clicks a button and an inspect like highligther needs to kick in. We want to this to be cross browser. </p>
  
  <p>For this we need to detect the DOM element during the mouse move, and once we have this element we need to highlight with CSS.</p>
  
  <p>We have problems detecting the DOM element by mouse move, can you guide us how this is done?</p>
  
  <p>Once we have this DOM element, on user click we need to extract XPath.</p>