How to add current, parent, and ancestor menu item IDs to body_class()?

From my comment earlier: Use the body_class() function in your header.php file or wherever your body tag is, e.g. <body <?php body_class(); ?>>. This will give you an output with a bunch of classes on the body that you can then use in your CSS. For example, <body class="page page-id-114 page-parent page-template-default logged-in admin-bar">. You can also use the body_class filter to add more classes. If you want to add the slug, for instance, you would global $post and then use $post->post_name.

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