https://www.worldbookonline.com/myaccount/scripts/systemInfo.js

1function detectBrowser() {
2    var ua = navigator.userAgent;
3
4    if (ua.indexOf("Edg/") > -1) {
5        return "Microsoft Edge " + ua.match(/Edg\/([\d.]+)/)[1];
6    } else if (ua.indexOf("Chrome/") > -1 && ua.indexOf("Safari/") > -1) {
7        return "Google Chrome " + ua.match(/Chrome\/([\d.]+)/)[1];
8    } else if (ua.indexOf("Firefox/") > -1) {
9        return "Mozilla Firefox " + ua.match(/Firefox\/([\d.]+)/)[1];
10    } else if (ua.indexOf("Safari/") > -1 && ua.indexOf("Version/") > -1) {
11        return "Apple Safari " + ua.match(/Version\/([\d.]+)/)[1];
12    } else if (ua.indexOf("MSIE") > -1 || ua.indexOf("Trident/") > -1) {
13        return "Internet Explorer";
14    }
15    return "Unknown";
16}
17
18function detectPlatform() {
19    // navigator.userAgentData is the modern API (Chromium-based browsers)
20    if (navigator.userAgentData && navigator.userAgentData.platform) {
21        return navigator.userAgentData.platform;
22    }
23    return navigator.platform || "Unknown";
24}
25
26function openSystemInfo() {
27    document.getElementById("systemInfo-jsSupport").textContent = "YES";
28    document.getElementById("systemInfo-browser").textContent = detectBrowser();
29    document.getElementById("systemInfo-platform").textContent = detectPlatform();
30    document.getElementById("systemInfoOverlay").style.display = "block";
31    document.getElementById("systemInfoDialog").style.display = "block";
32}
33
34function closeSystemInfo() {
35    document.getElementById("systemInfoOverlay").style.display = "none";
36    document.getElementById("systemInfoDialog").style.display = "none";
37}