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Creating dynamic graphics on a web page used to be a pain for developers; to paint something, they had to implement tricks with CSS or use third party plug-ins like Flash or Java applets. Now, with the newly introduced canvas element in HMTL5, all you need to do is put an element on your page and paint anything you want by creating scriptable graphics with JavaScript.
Read this article to learn how to paint on a page with HTML5's canvas element through a simple painting application example.