// onclick event using inline event handling
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>events</title>
<style>
body {
background-color: aquamarine;
}
</style>
</head>
<body>
<h1> hi javascript </h1>
<button onclick ="myfunction()">Click me</button>
<p id = "demo"></p>
<script>
function myfunction(){
document.getElementById("demo").innerHTML="Hello World";
}
</script>
</body>
</html>