crossOrigin attribute of an
Answers shouldn't need to worry about CORS
The amount of boilerplate already required by JS image proccessing answers is rather ridiculous. Requiring support for CORS is compensating for a frivilous limitation of the server/client sending/recieving the data/image.
CORS is also only an issue when the code is run remotely. If it is saved locally and run, CORS issues will not arise. Meaning answers not supporting CORS are perfectly fine, just not as-is when hosted.