< !DOCTYPE html>
<html lang="en">
<head>
Kmeta charset="UTF-8">
<title>hel loWorld</title>
<style>
div {
text-align: center;
font-size: 20px;
</ style>
</head>
<body>
<div id="hello">hel lo</div>
</body>
<script>
var
oDiv=document . getElementById( 'hello') ;
oDiv . oncl ick= function() {
alert ( 'hel lo world!') ;
</ script>
</html>