Index: wp-content/themes/twentyfourteen/functions.php
===================================================================
--- wp-content/themes/twentyfourteen/functions.php	(revision 25069)
+++ wp-content/themes/twentyfourteen/functions.php	(working copy)
@@ -68,11 +68,19 @@
 	) );
 
 	/*
+	 * Switches default core markup for search form, comment form, and comments
+	 * to output valid HTML5.
+	 */
+	add_theme_support( 'html5', array(
+		'search-form', 'comment-form', 'comment-list',
+	) );
+
+	/*
 	 * Enable support for Post Formats.
 	 * See http://codex.wordpress.org/Post_Formats
 	 */
 	add_theme_support( 'post-formats', array(
-		'aside', 'image', 'video', 'quote', 'link', 'gallery'
+		'aside', 'image', 'video', 'quote', 'link', 'gallery',
 	) );
 
 	/*
Index: wp-content/themes/twentyfourteen/comments.php
===================================================================
--- wp-content/themes/twentyfourteen/comments.php	(revision 25069)
+++ wp-content/themes/twentyfourteen/comments.php	(working copy)
@@ -40,9 +40,6 @@
 			wp_list_comments( array(
 				'style'      => 'ol',
 				'short_ping' => true,
-
-				// TODO: Remove callback and update styles.
-				'callback'=>'twentyfourteen_comment',
 			) );
 		?>
 	</ol><!-- .comment-list -->
Index: wp-content/themes/twentyfourteen/inc/template-tags.php
===================================================================
--- wp-content/themes/twentyfourteen/inc/template-tags.php	(revision 25069)
+++ wp-content/themes/twentyfourteen/inc/template-tags.php	(working copy)
@@ -84,59 +84,6 @@
 }
 endif;
 
-if ( ! function_exists( 'twentyfourteen_comment' ) ) :
-/**
- * Template for comments and pingbacks.
- *
- * Used as a callback by wp_list_comments() for displaying the comments.
- *
- */
-function twentyfourteen_comment( $comment, $args, $depth ) {
-	$GLOBALS['comment'] = $comment;
-	switch ( $comment->comment_type ) :
-		case 'pingback' :
-		case 'trackback' :
-	?>
-	<li class="post pingback">
-		<p><?php _e( 'Pingback:', 'twentyfourteen' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __( 'Edit', 'twentyfourteen' ), ' ' ); ?></p>
-	<?php
-			break;
-		default :
-	?>
-	<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
-		<article id="comment-<?php comment_ID(); ?>" class="comment">
-			<footer>
-				<div class="comment-author vcard">
-					<span class="comment-author-avatar"><?php echo get_avatar( $comment, 32 ); ?></span>
-					<?php printf( __( '%s', 'twentyfourteen' ), sprintf( '<cite class="fn">%s</cite> says:', get_comment_author_link() ) ); ?>
-				</div><!-- .comment-author .vcard -->
-			</footer>
-
-			<div class="comment-content">
-				<?php comment_text(); ?>
-				<?php if ( $comment->comment_approved == '0' ) : ?>
-					<p><em><?php _e( 'Your comment is awaiting moderation.', 'twentyfourteen' ); ?></em></p>
-				<?php endif; ?>
-			</div>
-
-			<div class="comment-meta commentmetadata">
-				<a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>"><time pubdate datetime="<?php comment_time( 'c' ); ?>">
-				<?php
-					/* translators: 1: date, 2: time */
-					printf( __( '%1$s at %2$s', 'twentyfourteen' ), get_comment_date(), get_comment_time() ); ?>
-				</time></a>
-				<?php comment_reply_link( array_merge( $args, array( 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?>
-				<?php edit_comment_link( __( 'Edit', 'twentyfourteen' ), ' ' );
-				?>
-			</div><!-- .comment-meta .commentmetadata -->
-		</article><!-- #comment-## -->
-
-	<?php
-			break;
-	endswitch;
-}
-endif; // ends check for twentyfourteen_comment()
-
 if ( ! function_exists( 'twentyfourteen_posted_on' ) ) :
 /**
  * Prints HTML with meta information for the current post-date/time and author.
Index: wp-content/themes/twentyfourteen/style.css
===================================================================
--- wp-content/themes/twentyfourteen/style.css	(revision 25069)
+++ wp-content/themes/twentyfourteen/style.css	(working copy)
@@ -1850,33 +1850,32 @@
 	margin: 0 0 48px 0;
 	margin: 0 0 4.8rem 0;
 }
-.comment-meta,
+.comment-metadata,
 .comment-author {
 	font-size: 14px;
 	font-size: 1.4rem;
 	line-height: 1.7142857142;
 }
-.comment-author cite {
+.comment-author .fn {
 	font-weight: 900;
 	text-transform: uppercase;
 }
 .comment-author a {
 	color: #2b2b2b;
 }
-.comment-meta a,
-.comment-list li.trackback a,
-.comment-list li.pingback a {
+.comment-metadata a,
+.comment-list .trackback a,
+.comment-list .pingback a {
 	color: #767676;
 }
 .comment-author a:hover,
-.comment-meta a:hover,
+.comment-metadata a:hover,
 .comment-list .trackback a:hover,
 .comment-list .pingback a:hover {
 	color: #24890d;
 	text-decoration: none;
 }
-.comment-edit-link:before,
-.comment-reply-link:before {
+.comment-edit-link:before {
 	color: rgba(0, 0, 0, 0.2);
 	content: '\007c\0020';
 }
@@ -1896,14 +1895,13 @@
 	background: none;
 	min-height: 48px;
 	min-height: 4.8rem;
-	position: relative;
 }
 .comment-author {
 	padding-left: 36px;
 	padding-left: 3.6rem;
 	position: relative;
 }
-.comment-author .comment-author-avatar {
+.comment-author .avatar {
 	border: 1px solid rgba(0, 0, 0, 0.1);
 	padding: 2px;
 	padding: 0.2rem;
@@ -1916,10 +1914,10 @@
 	height: 22px;
 	height: 2.2rem;
 }
-.bypostauthor .comment-author .comment-author-avatar {
+.bypostauthor .avatar {
 	background-color: #24890d;
 }
-.comment-author cite {
+.comment-author .fn {
 	font-style: normal;
 }
 .comment-author .avatar {
@@ -1933,7 +1931,7 @@
 	height: 22px;
 	height: 2.2rem;
 }
-.comment-meta,
+.comment-metadata,
 .comment-content {
 	padding-left: 36px;
 	padding-left: 3.6rem;
@@ -2412,7 +2410,7 @@
 	.content-area .entry-date a:before,
 	.content-area .byline a:before,
 	.content-area .comments-link a:before,
-	.content-area .edit-link a:before,
+	.entry-meta .edit-link a:before,
 	.attachment .entry-date:before,
 	.content-area .full-size-link a:before,
 	.content-area .parent-post-link a:before {
@@ -2475,7 +2473,7 @@
 		margin: -1px 2px 0 0;
 		margin: -0.1rem 0.2rem 0 0;
 	}
-	.content-area .edit-link a:before {
+	.entry-meta .edit-link a:before {
 		content: '\F411';
 		margin: -1px 2px 0 0;
 		margin: -0.1rem 0.2rem 0 0;
@@ -2486,7 +2484,7 @@
 	.content-area .parent-post-link a:before {
 		content: '\F301';
 	}
-	.page .content-area .edit-link a:before {
+	.page .entry-meta .edit-link a:before {
 		margin: 5px 2px 0 0;
 		margin: 0.5rem 0.2rem 0 0;
 	}
@@ -2605,25 +2603,21 @@
 		margin-top: 0;
 	}
 	.comments-area article,
-	.comment-list li.trackback,
-	.comment-list li.pingback {
+	.comment-list .trackback,
+	.comment-list .pingback {
 		margin-bottom: 36px;
 		margin-bottom: 3.6rem;
 		padding-top: 36px;
 		padding-top: 3.6rem;
 	}
-	.comment-author {
-		padding-left: 60px;
-		padding-left: 6.0rem;
-	}
-	.comment-author .comment-author-avatar,
 	.comment-author .avatar {
 		width: 32px;
 		width: 3.2rem;
 		height: 32px;
 		height: 3.2rem;
 	}
-	.comment-meta,
+	.comment-author,
+	.comment-metadata,
 	.comment-content {
 		padding-left: 60px;
 		padding-left: 6.0rem;
@@ -2632,8 +2626,8 @@
 	.no-comments,
 	.comment-respond,
 	.comments-area article,
-	.comment-list li.trackback,
-	.comment-list li.pingback,
+	.comment-list .trackback,
+	.comment-list .pingback,
 	.post-navigation [rel="prev"],
 	.post-navigation [rel="next"] {
 		padding-right: 9.12778904%;
@@ -2652,8 +2646,8 @@
 	.full-width .comments-title,
 	.full-width .comment-respond,
 	.full-width .comments-area article,
-	.full-width .comment-list li.trackback,
-	.full-width .comment-list li.pingback {
+	.full-width .comment-list .trackback,
+	.full-width .comment-list .pingback {
 		padding-right: 6.04307432%;
 		padding-left: 6.04307432%;
 	}
@@ -2728,8 +2722,8 @@
 	.no-comments,
 	.comment-respond,
 	.comments-area article,
-	.comment-list li.trackback,
-	.comment-list li.pingback,
+	.comment-list .trackback,
+	.comment-list .pingback,
 	.post-navigation [rel="prev"],
 	.post-navigation [rel="next"] {
 		padding-right: 12.39493534%;
@@ -2752,8 +2746,8 @@
 	.full-width .comments-title,
 	.full-width .comment-respond,
 	.full-width .comments-area article,
-	.full-width .comment-list li.trackback,
-	.full-width .comment-list li.pingback {
+	.full-width .comment-list .trackback,
+	.full-width .comment-list .pingback {
 		padding-right: 11.30926724%;
 		padding-left: 11.30926724%;
 	}
@@ -2923,8 +2917,8 @@
 	.no-comments,
 	.comment-respond,
 	.comments-area article,
-	.comment-list li.trackback,
-	.comment-list li.pingback,
+	.comment-list .trackback,
+	.comment-list .pingback,
 	.post-navigation [rel="prev"],
 	.post-navigation [rel="next"] {
 		padding-right: 9.87001616%;
@@ -2943,8 +2937,8 @@
 	.full-width .comments-title,
 	.full-width .comment-respond,
 	.full-width .comments-area article,
-	.full-width .comment-list li.trackback,
-	.full-width .comment-list li.pingback {
+	.full-width .comment-list .trackback,
+	.full-width .comment-list .pingback {
 		padding-right: 5.882236%;
 		padding-left: 5.882236%;
 	}
@@ -2997,8 +2991,8 @@
 	.no-comments,
 	.comment-respond,
 	.comments-area article,
-	.comment-list li.trackback,
-	.comment-list li.pingback,
+	.comment-list .trackback,
+	.comment-list .pingback,
 	.post-navigation [rel="prev"],
 	.post-navigation [rel="next"] {
 		padding-right: 12.44146986%;
@@ -3035,8 +3029,8 @@
 	.full-width .comments-title,
 	.full-width .comment-respond,
 	.full-width .comments-area article,
-	.full-width .comment-list li.trackback,
-	.full-width .comment-list li.pingback {
+	.full-width .comment-list .trackback,
+	.full-width .comment-list .pingback {
 		padding-right: 11.21868265%;
 		padding-left: 11.21868265%;
 	}
@@ -3075,8 +3069,8 @@
 	.full-width .comments-title,
 	.full-width .comment-respond,
 	.full-width .comments-area article,
-	.full-width .comment-list li.trackback,
-	.full-width .comment-list li.pingback {
+	.full-width .comment-list .trackback,
+	.full-width .comment-list .pingback {
 		padding-right: 0;
 	}
 }
\ No newline at end of file