Re: [w3c/permissions] A new permission for canvas data (#165)

I'd naively hope that a better approach would be to standardize algorithms for drawing on canvases, so that privacy-sensitive browsers can get results that are uniform across users. Even if the result is slower, that seems like a better result for people using Tor than simply being locked out of canvas-using websites. However, you've almost certainly already tried that, and it doesn't work for some reason. I'd appreciate if you write a Note describing that reason, and include it with the new permission.

I want to ask if you have evidence that users understand the prompt, but actually if Mozilla's shipping a prompt for something, it probably makes sense to add the permission name eagerly so that sites can check for it. @raymeskhoury, what do you think?

@tomrittervg, I assume you'll write the PR for this spec? Are you also volunteering to write the change to the [canvas spec](https://html.spec.whatwg.org/multipage/canvas.html) to use the "canvas-pixeldata" permission?

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