editor.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Online Code Editor</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="editor-container">
        <div class="left-part">
            <div class="content">
                <label for="html-code">HTML</label>
                <textarea id="html-code" placeholder="Write your HTML here..."></textarea>
            </div>
            <div class="content">
                <label for="css-code">CSS</label>
                <textarea id="css-code" placeholder="Write your CSS here..."></textarea>
            </div>
            <div class="content">
                <label for="js-code">JavaScript</label>
                <textarea id="js-code" placeholder="Write your JavaScript here..."></textarea>
            </div>
            <div class="run-button-container">
                <button id="run-button">Run</button>
            </div>
        </div>
        <div class="right-part">
            <iframe id="output" style="width: 100%; height: 100%; border: 1px solid #ddd;"></iframe>
        </div>
    </div>
    <script src="script.js" defer></script>
</body>
</html>