Source: dependencies/pixi-gl-core/createContext.js

/**
 * Helper class to create a webGL Context
 *
 * @class
 * @memberof PIXI.glCore
 * @param canvas {HTMLCanvasElement} the canvas element that we will get the context from
 * @param options {Object} An options object that gets passed in to the canvas element containing the context attributes,
 *                         see https://developer.mozilla.org/en/docs/Web/API/HTMLCanvasElement/getContext for the options available
 * @return {WebGLRenderingContext} the WebGL context
 */
var createContext = function(canvas, options)
{
    var gl = canvas.getContext('webgl', options) || 
         canvas.getContext('experimental-webgl', options);
    if (!gl)
    {
        // fail, not able to get a context
        throw new Error('This browser does not support webGL. Try using the canvas renderer');
    }
    return gl;
};
module.exports = createContext;