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WebGL is the version of OpenGL, which is a 3D engine. It helps its user to perform 3D manipulation in web browsers. Canvas is a part of HTML5, allows its users with dynamic, script rendered 2D shapes. It can be considered a low level that has the ability to update bitmap images and does not have a built-in scene graph.
HTML5 Canvas is also used to write WebGL applications. To create a WebGL rendering context on the canvas element, you should pass the string experimental-webgl, instead of 2d to the canvas. getContext() method. Some browsers support only 'webgl'.
It is a low level, procedural model that updates a bitmap. HTML5 Canvas also helps in making 2D games. While the HTML5 canvas offers its own 2D drawing API, it also supports the WebGL API to allow 3D rendering with OpenGL ES.
The cast result can be used to check whether HTML5 canvas is supported in the browser.
How to know if a canvas is running a "WebGL" or just normal canvas?
from inspecting the source, I find it a canvas in either case.
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