Canvas fingerprinting is a technique used by websites to track visitors who access their content. It uses the HTML5 canvas (HyperText Markup Language 5), a programming language for displaying and organizing Web pages, to do the job. 

To create a canvas fingerprint, HTML5 instructs the browser to draw text or 3D graphics on the canvas when a user visits a site. It is then rendered into a digital token that serves as a unique identifier that allows the website to remember the visitor and its browsing history. 

A canvas fingerprint is able to track website visitors based on the user’s browser, operating system, and graphics hardware.

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