/ Published in: PHP
                    
                                        
                            
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<?php
if ( is_page() && $post->post_parent ) {
$id = get_the_ID();
$a = get_ancestors( $id, 'page' );
$rootId = $a[$root];
}
else {
$rootId = get_the_ID();
}
?>
<body <?php body_class(); ?> id="root-id-<?php echo $rootId ?>">
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