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/**
 * @author alteredq / http://alteredqualia.com/
 * @author mr.doob / http://mrdoob.com/
 */
 
module.exports = function() {
  return {
  	canvas : !! window.CanvasRenderingContext2D,
  	webgl : ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( 'canvas' ).getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(),
  	workers : !! window.Worker,
  	fileapi : window.File && window.FileReader && window.FileList && window.Blob,
 
  	getWebGLErrorMessage : function () {
 
  		var domElement = document.createElement( 'div' );
 
  		domElement.style.fontFamily = 'monospace';
  		domElement.style.fontSize = '13px';
  		domElement.style.textAlign = 'center';
  		domElement.style.background = '#eee';
  		domElement.style.color = '#000';
  		domElement.style.padding = '1em';
  		domElement.style.width = '475px';
  		domElement.style.margin = '5em auto 0';
 
  		if ( ! this.webgl ) {
 
  			domElement.innerHTML = window.WebGLRenderingContext ? [
  				'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation">WebGL</a>.<br />',
  				'Find out how to get it <a href="http://get.webgl.org/">here</a>.'
  			].join( '\n' ) : [
  				'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation">WebGL</a>.<br/>',
  				'Find out how to get it <a href="http://get.webgl.org/">here</a>.'
  			].join( '\n' );
 
  		}
 
  		return domElement;
 
  	},
 
  	addGetWebGLMessage : function ( parameters ) {
 
  		var parent, id, domElement;
 
  		parameters = parameters || {};
 
  		parent = parameters.parent !== undefined ? parameters.parent : document.body;
  		id = parameters.id !== undefined ? parameters.id : 'oldie';
 
  		domElement = Detector.getWebGLErrorMessage();
  		domElement.id = id;
 
  		parent.appendChild( domElement );
 
  	}
 
  };
}