using WebGL through emscripten on an html5 canvas

Question

I have an HTML page with a canvas I've already created and I want to draw on it using WebGL though emscripten. I want the compiled C++ code to make GL calls which will go to that canvas I created in the HTML.
All examples I've seen use SDL or OpenKODE to create the canvas. I haven't found any that take the canvas from outside.
What's the proper way to do this?

Answer 1

You can set the canvas element of the module object,

var Module = {
  canvas: myCanvasDomElement
};