index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./style.css">
    <script src="https://kit.fontawesome.com/05936e9cdb.js" crossorigin="anonymous"></script>
    <title>Online Code Editor</title>
</head>
<body>
    <section class="container">
        <h3>Online Code Editor🧑‍💻</h3>
        
            <div class="editor">
                <div class="left">
                    <label><i class="fa-brands fa-html5"></i> HTML</label>
                    <textarea onkeyup="run()" id="html-code"></textarea>

                    <label><i class="fa-brands fa-css3-alt"></i> CSS</label>
                    <textarea onkeyup="run()" id="css-code"></textarea>

                    <label><i class="fa-brands fa-js"></i> JS</label>
                    <textarea onkeyup="run()" id="js-code"></textarea>
                </div>
                <div class="right">
                <label>Output</label>
                <iframe id="output"></iframe>
            </div>
            </div>
        
    </section>

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


</body>
</html>