[tor-talk] canvas image data

[Joe Btfsplk]

People have talked about the pop up message below, that apprears in TBB 
on many sites.
> "*This website (duckduckgo.com) attempted to access image data on a 
> canvas. Since canvas image data can be used to discover information 
> about your computer, blank image data was returned this time*" 
I'm not sure I've seen a consensus whether it's (always), (sometimes), 
(rarely) a bad idea to allow the site, or "we're not sure."
What happens if you don't even click the pop up - don't allow or 
forbid?  Does TBB then allow / deny the action by default?

If you *don't* click on the pop up, it goes away when you click 
something else, but that's not saying what it actually does.
Is it generally NOT an anonymity / privacy issue to play HTML5 content 
in TBB?