What role does HTML and CSS play in achieving consistent browser display in PHP?

HTML and CSS play a crucial role in achieving consistent browser display in PHP by allowing developers to structure the content and style it accordingly. By using HTML to create the layout and CSS to define the visual presentation, developers can ensure that their PHP-generated content appears consistently across different browsers and devices.

<!DOCTYPE html>
<html>
<head>
    <title>Consistent Browser Display</title>
    <style>
        /* CSS code for consistent styling */
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            color: #333;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 80%;
            margin: 0 auto;
            padding: 20px;
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
    </style>
</head>
<body>
    <div class="container">
        <?php
            // PHP code for generating content
            echo "<h1>Welcome to our website!</h1>";
            echo "<p>This is a PHP-generated content.</p>";
        ?>
    </div>
</body>
</html>