<html> 
<head><title>Hello World</title></head> 
 
<body> 
<h1>Hello World</h1><BR> 
<h1><p id='clock'></p></h1> 
<script type="text/javascript"> console.log("script log"); 
setInterval(function(){ console.log(new Date().toLocaleTimeString()); 
document.getElementById('clock').innerHTML=new Date().toLocaleTimeString(); },10000); 

document.writeln("<h2>Navigator.userAgent:</h2> " + navigator.userAgent + "<br />"); document.writeln("<h2>Navigator.appName: </h2>" + navigator.appName + "<br />"); document.writeln("<h2>Navigator.appCodeName: </h2>" + navigator.appCodeName + "<br />"); document.writeln("<h2>Navigator.appVersion: </h2>" + navigator.appVersion + "<br />"); function onBtn() {alert('JS alert test'); console.log("JS alert test");}</script> 

<button id="btn" name="AlertBtn" onclick="onBtn()">Click to show Alert Msg</button> 

</body> 
</html>