Untitled

<!DOCTYPE HTML>
<html>
    <head>
        <title>Rizky Anugrah XI-RPL 2</title>
    </head>
    <body>
        <h1 id="id1">This is Heading</h1>
        <button type="button" onclick="document.getElementById('id'1).style.color = 'red'">
        Click Me!
        </button>
    </body>
</html>