CanvasRenderer

The Canvas renderer displays your beautifully crafted scenes not using WebGL, but draws it using the (slower) Canvas 2D Context API.

This renderer can be a nice fallback from WebGLRenderer for simple scenes:

Note: both WebGLRenderer and CanvasRenderer are embedded in the web page using an HTML5 <canvas> tag. The "Canvas" in CanvasRenderer means it uses Canvas 2D instead of WebGL.
Don't confuse either CanvasRenderer with the SoftwareRenderer example, which simulates a screen buffer in a Javascript array.