Detector of browser functions

Detector.js

//  Detect canvas support
const DETECTOR = Object.freeze({
    CANVAS      :   (function () {
                        if (window.CanvasRenderingContext2D) {
                            return 'canvas';
                        }
                        return false;
                    })(),
    CLASSLIST   :   (function () {
                        return ('classList' in document.createElement('a'));
                    })(),
    FULLSCREEN  :   (function () {
                        if (document.fullscreenEnabled) {
                            return 'fullscreenEnabled';
                        }
                        if (document.webkitFullscreenEnabled) {
                            return 'webkitFullscreenEnabled';
                        }
                        if (document.mozFullScreenEnabled) {
                            return 'mozFullScreenEnabled';
                        }
                        if (document.msFullscreenEnabled) {
                            return 'msFullscreenEnabled';
                        }
                        return false;
                    })(),
    PIXELRATIO  :   (function () {
                        return window.devicePixelRatio || 1;
                    })(),
    POINTERLOCK :   (function () {
                        let canvas = document.createElement('canvas');
                        if (canvas && canvas.requestPointerLock) {
                            return 'requestPointerLock';
                        }
                        if (canvas && canvas.mozRequestPointerLock) {
                            return 'mozRequestPointerLock';
                        }
                        return false;
                    })(),
    WEBGL       :   (function () {
                        let canvas = document.createElement('canvas');
                        if (canvas && canvas.getContext('webgl')) {
                            return 'webgl';
                        }
                        if (canvas && canvas.getContext('experimental-webgl')) {
                            return 'experimental-webgl';
                        }
                        return false;
                    })(),
});

export default DETECTOR;