Mindfuck terminal in a browser - Teh Forum

<body> <div id="header"> <span class="left"> <span class="back"><a href="lthread_list.php?webtag=DEFAULT"><span class="image mobile_back" title="Back"></span></a></span> <span class="image mobile_logo" title="Beehive Forum Logo"></span> </span> <ul> <li> <a class="reply_all" href="lpost.php?webtag=DEFAULT&reply_to=40859.0&return_msg=40859.6"> <span class="image mobile_reply_all"></span><span class="text">Reply to All</span> </a> </li> <li> <a class="navigation" href="#"> <span class="image mobile_navigation"></span><span class="text">Show messages</span> </a> </li> <li> <a class="main" href="#"><span class="image mobile_menu" title="Menu"></span> </a> </li> </ul> </div> <div class="menu main"> <ul> <li><a href="lthread_list.php?webtag=DEFAULT">Messages</a></li> <li><a href="lpm.php?webtag=DEFAULT">Inbox</a></li> <li><a href="lsearch.php?webtag=DEFAULT">Search</a></li> <li><a href="llogon.php?webtag=DEFAULT">Login</a></li> </ul> </div> <div class="menu navigation"><a href="lmessages.php?webtag=DEFAULT&msg=40859.1">1–6</a></div> <div id="page_content"> <h3 class="thread_title"><a href="index.php?webtag=DEFAULT&amp;msg=40859.6">Mindfuck terminal in a browser</a> </h3> <div id="messages" data-navigation="40859_6_6_10"> <a name="a40859_6"></a><div class="message" id="message_40859_6"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time"> 5 Jan 2014 17:18</span> <div class="clearer"></div> </div><div class="message_to">To: 99% of gargoyles look like (MR_BASTARD) <span><span class="image post_read" title="Read: 5 Jan 2014 19:19"></span></span> <span class="message_count">6 of 6</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=40859.6">40859.6</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=40859.4">40859.4</a></div> <div class="message_body"> I think it's probably working, but there's some security hoops I'd have to jump through in order to tell (effectively rendering it useless, AFAICT).</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=40859.6&return_msg=40859.6" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="40859.6"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div></div> </div> </body>