54_eventObject.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>The Event Object</title>
</head>
<body>
    <div class="container" id="btn1">This is btn1</div>
</body>
</html>

<script src="54.js"></script>