https://robclouth.com/libs/Detector.js

1/**
2 * @author alteredq / http://alteredqualia.com/
3 * @author mr.doob / http://mrdoob.com/
4 */
5
6var Detector = {
7
8	canvas: !! window.CanvasRenderingContext2D,
9	webgl: ( function () { try { var canvas = document.createElement( 'canvas' ); return !! window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ); } catch( e ) { return false; } } )(),
10	workers: !! window.Worker,
11	fileapi: window.File && window.FileReader && window.FileList && window.Blob,
12
13	getWebGLErrorMessage: function () {
14
15		var element = document.createElement( 'div' );
16		element.id = 'webgl-error-message';
17		element.style.fontFamily = 'monospace';
18		element.style.fontSize = '13px';
19		element.style.fontWeight = 'normal';
20		element.style.textAlign = 'center';
21		element.style.background = '#fff';
22		element.style.color = '#000';
23		element.style.padding = '1.5em';
24		element.style.width = '400px';
25		element.style.margin = '5em auto 0';
26
27		if ( ! this.webgl ) {
28
29			element.innerHTML = window.WebGLRenderingContext ? [
30				'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br />',
31				'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
32			].join( '\n' ) : [
33				'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>',
34				'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
35			].join( '\n' );
36
37		}
38
39		return element;
40
41	},
42
43	addGetWebGLMessage: function ( parameters ) {
44
45		var parent, id, element;
46
47		parameters = parameters || {};
48
49		parent = parameters.parent !== undefined ? parameters.parent : document.body;
50		id = parameters.id !== undefined ? parameters.id : 'oldie';
51
52		element = Detector.getWebGLErrorMessage();
53		element.id = id;
54
55		parent.appendChild( element );
56
57	}
58
59};