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What is this magic?

I didn't check the source, but rendering the <canvas> to a data URL, and using something like this [0] would work.

[0]: http://stackoverflow.com/questions/5199902/isnt-it-silly-tha...

Yep, this is the strategy that I'm using. I export the canvas to data URL and place the data URL in the href attribute of the favicon <link>. I'm not sure if this works in every browser though.

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