https://www.waldis-berry.ch/cis-data/plugins/contens/checkBrowserSupport.strict.js?dt=202609211358

1function isInternetExplorer() {
2	let ua = window.navigator.userAgent,
3		msie = ua.indexOf("MSIE ");
4
5	if(msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)){
6		return true;
7	}
8
9	return false;
10}
11
12function incompleteFeatureSupport() {
13	// Check grid
14	$('<div class="feature-check--grid"><div></div></div>').appendTo('body');
15
16	// Check aspect-ratio
17	$('<div class="feature-check--aspect-ratio">').appendTo('body');
18
19	if($(".feature-check--grid > div").width() === 0 || $(".feature-check--aspect-ratio").height() === 0){
20		$(".feature-check--aspect-ratio").remove();
21		$(".feature-check--grid").remove();
22		return true;
23	}
24
25	$(".feature-check--aspect-ratio").remove();
26	$(".feature-check--grid").remove();
27	return false;
28
29}
30
31document.onreadystatechange = function(){
32	if(document.readyState === "complete" && document.cookie.indexOf('cookie_browser_notification') == -1){
33		if(isInternetExplorer() || incompleteFeatureSupport()){
34			// Display notification
35			let aHTML = [];
36			aHTML.push('<div class="browser_notification_overlay"></div>');
37			aHTML.push('<div class="browser_notification">');
38				aHTML.push('<span class="browser_notification_close"></span>');
39				aHTML.push('<p><strong>Ihr Browser wird nicht unterstützt!</strong><br />Sie verwenden einen veralteten Browser, der von dieser Webseite nicht mehr unterstützt wird.</p>');
40				aHTML.push('<p><a href="https://bestvpn.org/outdatedbrowser/de" target="_blank" rel="noopener">Browser aktualisieren</a></p>');
41			aHTML.push('</div>');
42
43			// Append to body
44			document.body.innerHTML += aHTML.join('');
45
46			document.querySelector('.browser_notification .browser_notification_close').addEventListener('click',function(){
47				let expirationDate = new Date;
48				expirationDate.setFullYear(expirationDate.getFullYear() + 1);
49				document.cookie = 'cookie_browser_notification=1; expires=' + expirationDate.toGMTString() + ";";
50
51				document.querySelector('.browser_notification_overlay').style.display = 'none';
52				document.querySelector('.browser_notification').style.display = 'none';
53			});
54		}
55	}
56};