Browser support- alternative to modernizr

initBrowserSupport.js

// Browser support
(function (d, h, w, n) {

	//function hasProperties(properties, tagName) {
	//	var isStyle = !!!tagName;
	//	tagName = tagName || 'div';
	//	var el = d.createElement(tagName);
	//	for (var prop in properties) {
	//		if ((isStyle ? el.style[properties[prop]] : el[properties[prop]]) !== undefined ) {
	//			return true;
	//		}
	//	}
	//	return false;
	//}

	var tests = {
			'touch' : ('ontouchstart' in w) || w.DocumentTouch && d instanceof DocumentTouch
			// 'formvalidation' : hasProperties(['checkValidity'],'form'),
			// 'pushState' : !!history.pushState,
		},
		htmlClasses = h.className,
		ua = n.userAgent;

	w.supports = tests;

	htmlClasses = htmlClasses.replace('no-js','js');

	for (var i in tests) {
		htmlClasses += (tests[i] ? ' ' : ' no-') + i;
	}

	IE = false;
	var browserString = ua.match(/edge/i) 
			? 'edge' 
			: ua.match(/Trident|firefox|chrome|safari/i)[0];
	if (browserString === 'Trident') {
		var version = ua.indexOf('rv: 11.0') > 0 || ua.indexOf('rv:11.0') > 0
				? 11
				: ua.substr(ua.indexOf('MSIE')+ 5,2).replace('.','');
		h.className += ' ie ie' + version;
		IE = parseInt(version, 10);
	} else {
			h.className+=' ' + browserString.toLowerCase();
			w[browserString.toUpperCase()] = true;
	}

	h.setAttribute('ua', n.userAgent);
	h.setAttribute('os', n.platform);

})(document,document.documentElement,window,navigator);