Disable Login Field Autofocus

<?php
/**
 * Removes the auto-focus behavior on the username field at wp-login.php.
 * Prevents browsers from automatically highlighting and populating the
 * credential field before the user interacts with the page.
 */
if ( ! function_exists( 'scseed_disable_login_autofocus' ) ) {
    function scseed_disable_login_autofocus() {
        ?>
        <script>
        document.addEventListener('DOMContentLoaded', function() {
            var field = document.getElementById('user_login');
            if (!field) { return; }
            field.removeAttribute('autofocus');
            if (document.activeElement === field) {
                field.blur();
            }
        });
        </script>
        <?php
    }
    add_action( 'login_head', 'scseed_disable_login_autofocus' );
}