title: How to download canvas with background image?
body: <p>I have a canvas element that I'm setting the background on dynamically via code. Then I'm using the Sketch library (<a href="http://intridea.github.io/sketch.js/" rel="nofollow">http://intridea.github.io/sketch.js/</a>) to draw on the canvas. - This all works.</p>
  
  <p>However, whenever I try to convert the canvas using canvas.toDataURL("image/png") it's able to save the canvas drawing, however isn't saving the background. - I understand this is working as designed.</p>
  
  <p>Is there a way to merge the two? I was toying around with the idea that I could set the image src to the background src after I'm done drawing and try to export that, however I'm not certain. Does anyone have any experience with this?</p>