HTML2Canvas Transparent Background Capture

Hi @h_classen:
Thank you for reviewing the challenge.
When I bring the HTML2Canvas saved file into a mac photo app on my computer, the resultant .png doesn't seem to have an alpha channel or transparent background. I would expect to see only the dark text without any white, gray or black showing in the background.

Unfortunately, I do not see a transparent image being created right out of the box.

I did try the backgroundColor : 'null", option but my syntax could be incorrect.

I could very well be missing something.

Patrick (o: