text: /**
   * @author alteredq / http://alteredqualia.com/
   * @author mr.doob / http://mrdoob.com/
   */
  
  module.exports = {
  
    isWebGLAvailable: function () {
  
      try {
  
        var canvas = document.createElement( 'canvas' );
        return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ) );
  
      } catch ( e ) {
  
        return false;
  
      }
  
    },
  
    isWebGL2Available: function () {
  
      try {
  
        var canvas = document.createElement( 'canvas' );
        return !! ( window.WebGL2RenderingContext && canvas.getContext( 'webgl2' ) );
  
      } catch ( e ) {
  
        return false;
  
      }
  
    },
  
    getWebGLErrorMessage: function () {
  
      return this.getErrorMessage( 1 );
  
    },
  
    getWebGL2ErrorMessage: function () {
  
      return this.getErrorMessage( 2 );
  
    },
  
    getErrorMessage: function ( version ) {
  
      var names = {
        1: 'WebGL',
        2: 'WebGL 2'
      };
  
      var contexts = {
        1: window.WebGLRenderingContext,
        2: window.WebGL2RenderingContext
      };
  
      var message = 'Your $0 does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">$1</a>';
  
      var element = document.createElement( 'div' );
      element.id = 'webglmessage';
      element.style.fontFamily = 'monospace';
      element.style.fontSize = '13px';
      element.style.fontWeight = 'normal';
      element.style.textAlign = 'center';
      element.style.background = '#fff';
      element.style.color = '#000';
      element.style.padding = '1.5em';
      element.style.width = '400px';
      element.style.margin = '5em auto 0';
  
      if ( contexts[ version ] ) {
  
        message = message.replace( '$0', 'graphics card' );
  
      } else {
  
        message = message.replace( '$0', 'browser' );
  
      }
  
      message = message.replace( '$1', names[ version ] );
  
      element.innerHTML = message;
  
      return element;
  
    }
  
  };
  