https://www.livesport.cz/x/js/browsercompatibility_5.js

1// !!! for update iterate manually `browser_compatibility_serial`
2"use strict";
3try {
4    (function () {
5        var cssRequirements = [["display", "flex"], ["display", "grid"], ["color", "red"]];
6        for (var i in cssRequirements) {
7            if (!CSS.supports(cssRequirements[i][0], cssRequirements[i][1])) {
8                throw "no-" + cssRequirements[i][0] + "-" + cssRequirements[i][1];
9            }
10        }
11        try {
12            new XMLHttpRequest();
13        }
14        catch (pass) {
15            throw "no-ajax";
16        }
17        try {
18            eval("var foo = (x)=>x+1");
19        }
20        catch (pass) {
21            throw "no-es6";
22        }
23        try {
24            eval("var foo = {}; var bar = {...foo};")
25        }
26        catch (pass) {
27            throw "no-spread";
28        }
29        try {
30            new AbortController()
31        }
32        catch (pass) {
33            throw "no-abort-controller";
34        }
35    })();
36}
37catch (e) {
38    var utm = "";
39    if (typeof e == "string" && /^[a-z0-9\-]+$/.test(e)) {
40        utm = "?err=" + e;
41    }
42    window.location.replace("/unsupported/" + utm);
43}