What are common compatibility issues between PHP-generated templates and different browsers like Firefox and Internet Explorer?

Common compatibility issues between PHP-generated templates and different browsers like Firefox and Internet Explorer include CSS rendering inconsistencies, JavaScript compatibility problems, and layout issues. To solve these problems, it is important to ensure that the HTML, CSS, and JavaScript code generated by PHP is standards-compliant and follows best practices for cross-browser compatibility.

<!DOCTYPE html>
<html>
<head>
    <style>
        /* CSS code for styling */
    </style>
</head>
<body>
    <script>
        // JavaScript code for functionality
    </script>
</body>
</html>