title: How to generate unique css selector for DOM element?
body: <p>I need to generate unique css selector for elements.<br>
  Particularly, I have onclick event handler that should remember what target element
  was clicked and send this info to my server. Is there a way to do it without doing DOM modifications?</p>
  
  <p>P.S. my javascript code supposed to be run on different<br>
  3-rd party websites so I can't make any assumptions about html.</p>