If you've decided to make your next webapp's interface in Canvas, you are jeopardizing what makes the web flourish in the first place: openness. I personally agree with DHH that View Source is one of the browser's most liberating feature. Others in this thread have also pointed issues in accessibility.
It's a shame that this is what the web is trending towards with more and more enterprise interest in the internet.
It's a shame that this is what the web is trending towards with more and more enterprise interest in the internet.