7-remove-event-listner.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Remove event listner</title>
    <link rel="stylesheet" type="text/css" href="">
</head>

<body>
    <h1>Remove event listner</h1>
    <button id="btn">Click me</button>
    <script src="js/7-remove-event-listner.js"></script>
</body>

</html>