What are the potential pitfalls of not fixing HTML validation errors before styling with CSS?

If HTML validation errors are not fixed before styling with CSS, it can lead to unpredictable rendering of the website across different browsers and devices. This can result in layout issues, broken functionality, and poor user experience. It is important to ensure that the HTML code is valid and error-free before applying CSS styles to maintain consistency and compatibility.

<!DOCTYPE html>
<html>
<head>
    <title>Fix HTML Validation Errors</title>
    <style>
        /* CSS styles go here */
    </style>
</head>
<body>
    <!-- HTML content goes here -->
</body>
</html>