Checkboxes can't be checked by default. This is to ensure you use scalable conventions in creating and maintaining your site. For instance, if you added a checkbox to an existing site that already had thousands of pages, and made the default "checked", then that would only apply to newly created pages from there … all of your thousands of existing pages would still be unchecked. Confusion, problems, and potentially a whole lot of work ensues. Whereas if you use checkboxes to toggle a non-default