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xmlns:fb in default PAGE_CONTAINER


Well-known member
Hello, I have observed that XenForo, with facebook option disabled and the default template, in the second line of page_container has a line like this:
<html id="XenForo" lang="{$visitorLanguage.language_code}" dir="{$visitorLanguage.text_direction}" class="Public {xen:if {$visitor.user_id}, 'LoggedIn', 'LoggedOut'} {xen:if {$sidebar}, 'Sidebar', 'NoSidebar'}" xmlns:fb="http://www.facebook.com/2008/fbml">
Does facebook get info from the site with this? I don't know what that code does.