title: Detect distance of HTML element from to top and to left?
body: <p>I have a  tag within a HTML5 document. </p>
  
  <p>How can I detect the distance with JavaScript from the top-left corner of the HTML page to the top left corner of the canvas tag?  </p>
  
  <p>I need to be able to position dynamically generated html tags relative to the canvas.</p>