Hello, list. Spec says <http://www.whatwg.org/specs/web-apps/current-work/#todataurl>:
> When trying to use types other than image/png, authors can check if > the image was really returned in the requested format by checking to > see if the returned string starts with the exact string > "data:image/png" or not. If it does, the image is PNG, and thus the > requested type was not supported. This should probably be ammended to starting with one of these exact strings: "data:image/png," or "data:image/png;". This ensures that no future content type that starts with "image/png" can break the application.
