Use new HTML5 main element.

templates/2k11/admin/index.tpl

@@ -49,7 +49,7 @@
         </div>
     </header>
 {/if}
-    <div id="main" class="clearfix">
+    <main class="clearfix">
     {if NOT $admin_vars.is_logged_in}
         {$admin_vars.out|@serendipity_refhookPlugin:'backend_login_page'}
         {* <div id="login_container"> *}
@@ -179,7 +179,7 @@
         {$admin_vars.main_content}
         </div>
     {/if}
-    </div>
+    </main>
 {if NOT $admin_vars.no_footer}
     <footer id="meta">
         <small>{$admin_vars.version_info}</small>

templates/2k11/admin/js/2k11.admin.js

@@ -37,7 +37,6 @@
 
     AccessifyHTML5({
         header: '#top>div>div',
-        main:   '#content',
         footer: '#meta'
     });
 })(jQuery);

templates/2k11/admin/style.css

@@ -8,6 +8,7 @@ figure,
 footer,
 header,
 hgroup,
+main,
 nav,
 section,
 summary { display: block; }
@@ -972,7 +973,7 @@ summary {
 /* LAYOUT
    ----------------------------------------------------------------- */
 #top>div,
-#main {
+main {
     margin: 0 auto;
     max-width: 1280px;
     width: 96%;