To detect user agent in JavaScript, simple read navigator.userAgent.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mobile-Web-App: Detect Browser</title>
<script type="text/javascript">
function detectbrowser(){
info = "<p><b>Browser info: </b></p>"
+ "<p>user agent: " + navigator.userAgent + "</p>";
document.getElementById("browserinfo").innerHTML=info;
}
</script>
</head>
<body onload="detectbrowser();">
<h1>Mobile-Web-App: Javascript Exercise - Detect User Agent</h1>
<div id="browserinfo"></div>
</body>
</html>
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