"After plugins and plugin-provided information, we believe that the HTML5 Canvas is the single largest fingerprinting threat browsers face today." - Tor Project.
Original research: [http://cseweb.ucsd.edu/~hovav/dist/canvas.pdf Pixel Perfect: Fingerprinting Canvas in HTML5], demo: [https://www.browserleaks.com/canvas HTML5 Canvas Fingerprinting].
= See Also =
* [http://www.chromium.org/Home/chromium-security/client-identification-mechanisms Chromium's list of client identification mechanisms]