Index: wp-content/themes/twentyeleven/header.php
===================================================================
--- wp-content/themes/twentyeleven/header.php	(revision 18313)
+++ wp-content/themes/twentyeleven/header.php	(working copy)
@@ -110,7 +110,7 @@
 			<?php endif; ?>
 
 			<nav id="access" role="navigation">
-				<h1 class="assistive-text"><?php _e( 'Main menu', 'twentyeleven' ); ?></h1>
+				<h2 class="assistive-text"><?php _e( 'Main menu', 'twentyeleven' ); ?></h2>
 				<?php /*  Allow screen readers / text browsers to skip the navigation menu and get right to the good stuff. */ ?>
 				<div class="skip-link"><a class="assistive-text" href="#content" title="<?php esc_attr_e( 'Skip to primary content', 'twentyeleven' ); ?>"><?php _e( 'Skip to primary content', 'twentyeleven' ); ?></a></div>
 				<div class="skip-link"><a class="assistive-text" href="#secondary" title="<?php esc_attr_e( 'Skip to secondary content', 'twentyeleven' ); ?>"><?php _e( 'Skip to secondary content', 'twentyeleven' ); ?></a></div>
Index: wp-content/themes/twentyeleven/functions.php
===================================================================
--- wp-content/themes/twentyeleven/functions.php	(revision 18313)
+++ wp-content/themes/twentyeleven/functions.php	(working copy)
@@ -372,8 +372,8 @@
 		'id' => 'sidebar-1',
 		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 		'after_widget' => "</aside>",
-		'before_title' => '<h1 class="widget-title">',
-		'after_title' => '</h1>',
+		'before_title' => '<h2 class="widget-title">',
+		'after_title' => '</h2>',
 	) );
 
 	register_sidebar( array(
@@ -382,8 +382,8 @@
 		'description' => __( 'The sidebar for the optional Showcase Template', 'twentyeleven' ),
 		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 		'after_widget' => "</aside>",
-		'before_title' => '<h1 class="widget-title">',
-		'after_title' => '</h1>',
+		'before_title' => '<h2 class="widget-title">',
+		'after_title' => '</h2>',
 	) );
 
 	register_sidebar( array(
@@ -392,8 +392,8 @@
 		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
 		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 		'after_widget' => "</aside>",
-		'before_title' => '<h1 class="widget-title">',
-		'after_title' => '</h1>',
+		'before_title' => '<h2 class="widget-title">',
+		'after_title' => '</h2>',
 	) );
 
 	register_sidebar( array(
@@ -402,8 +402,8 @@
 		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
 		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 		'after_widget' => "</aside>",
-		'before_title' => '<h1 class="widget-title">',
-		'after_title' => '</h1>',
+		'before_title' => '<h2 class="widget-title">',
+		'after_title' => '</h2>',
 	) );
 
 	register_sidebar( array(
@@ -412,8 +412,8 @@
 		'description' => __( 'An optional widget area for your site footer', 'twentyeleven' ),
 		'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 		'after_widget' => "</aside>",
-		'before_title' => '<h1 class="widget-title">',
-		'after_title' => '</h1>',
+		'before_title' => '<h2 class="widget-title">',
+		'after_title' => '</h2>',
 	) );
 }
 add_action( 'widgets_init', 'twentyeleven_widgets_init' );
@@ -426,7 +426,7 @@
 
 	if ( $wp_query->max_num_pages > 1 ) : ?>
 		<nav id="<?php echo $nav_id; ?>">
-			<h1 class="assistive-text"><?php _e( 'Post navigation', 'twentyeleven' ); ?></h1>
+			<h2 class="assistive-text"><?php _e( 'Post navigation', 'twentyeleven' ); ?></h2>
 			<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentyeleven' ) ); ?></div>
 			<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentyeleven' ) ); ?></div>
 		</nav><!-- #nav-above -->
Index: wp-content/themes/twentyeleven/sidebar.php
===================================================================
--- wp-content/themes/twentyeleven/sidebar.php	(revision 18313)
+++ wp-content/themes/twentyeleven/sidebar.php	(working copy)
@@ -16,14 +16,14 @@
 			<?php if ( ! dynamic_sidebar( 'sidebar-1' ) ) : ?>
 
 				<aside id="archives" class="widget">
-					<h1 class="widget-title"><?php _e( 'Archives', 'twentyeleven' ); ?></h1>
+					<h2 class="widget-title"><?php _e( 'Archives', 'twentyeleven' ); ?></h2>
 					<ul>
 						<?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
 					</ul>
 				</aside>
 
 				<aside id="meta" class="widget">
-					<h1 class="widget-title"><?php _e( 'Meta', 'twentyeleven' ); ?></h1>
+					<h2 class="widget-title"><?php _e( 'Meta', 'twentyeleven' ); ?></h2>
 					<ul>
 						<?php wp_register(); ?>
 						<li><?php wp_loginout(); ?></li>
Index: wp-content/themes/twentyeleven/comments.php
===================================================================
--- wp-content/themes/twentyeleven/comments.php	(revision 18313)
+++ wp-content/themes/twentyeleven/comments.php	(working copy)
@@ -37,7 +37,7 @@
 
 		<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // are there comments to navigate through ?>
 		<nav id="comment-nav-above">
-			<h1 class="assistive-text"><?php _e( 'Comment navigation', 'twentyeleven' ); ?></h1>
+			<h2 class="assistive-text"><?php _e( 'Comment navigation', 'twentyeleven' ); ?></h2>
 			<div class="nav-previous"><?php previous_comments_link( __( '&larr; Older Comments', 'twentyeleven' ) ); ?></div>
 			<div class="nav-next"><?php next_comments_link( __( 'Newer Comments &rarr;', 'twentyeleven' ) ); ?></div>
 		</nav>
@@ -57,7 +57,7 @@
 
 		<?php if ( get_comment_pages_count() > 1 && get_option( 'page_comments' ) ) : // are there comments to navigate through ?>
 		<nav id="comment-nav-below">
-			<h1 class="assistive-text"><?php _e( 'Comment navigation', 'twentyeleven' ); ?></h1>
+			<h2 class="assistive-text"><?php _e( 'Comment navigation', 'twentyeleven' ); ?></h2>
 			<div class="nav-previous"><?php previous_comments_link( __( '&larr; Older Comments', 'twentyeleven' ) ); ?></div>
 			<div class="nav-next"><?php next_comments_link( __( 'Newer Comments &rarr;', 'twentyeleven' ) ); ?></div>
 		</nav>