title: Div overlay canvas, mouseover
body: <p><a href="https://i.stack.imgur.com/jG6Yd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jG6Yd.png" alt="canvas area with divs"></a></p>
  
  <p>I have canvas area, where i can add some images.
  And i want to cut whole canvas to parts and download just one part of image.</p>
  
  <p>If i put divs with color overlay canvas, i can't move my elements inside.
  But i want to show users which area has been selected and will be downloaded.</p>
  
  <p>Is it possible to show some divs overlay canvas and also manage with canvas?</p>
  
  <p>If don't how can i listening mouseover event for my div which is invisible, because have lower z-index, than my canvas image ?</p>