Index: src/wp-admin/js/theme.js
===================================================================
--- src/wp-admin/js/theme.js	(revision 26997)
+++ src/wp-admin/js/theme.js	(working copy)
@@ -198,7 +198,10 @@
 	render: function() {
 		var data = this.model.toJSON();
 		// Render themes using the html template
-		this.$el.html( this.html( data ) ).attr( 'tabindex', 0 );
+		this.$el.html( this.html( data ) ).attr({
+			tabindex: 0,
+			'aria-describedby' : data.id + '-action ' + data.id + '-name'
+		});
 
 		// Renders active theme styles
 		this.activeTheme();
Index: src/wp-admin/themes.php
===================================================================
--- src/wp-admin/themes.php	(revision 26997)
+++ src/wp-admin/themes.php	(working copy)
@@ -191,8 +191,11 @@
  * This PHP is synchronized with the tmpl-theme template below!
  */
 
-foreach ( $themes as $theme ) : ?>
-<div class="theme<?php if ( $theme['active'] ) echo ' active'; ?>" tabindex="0">
+foreach ( $themes as $theme ) :
+	$aria_action = esc_attr( $theme['id'] . '-action' );
+	$aria_name   = esc_attr( $theme['id'] . '-name' );
+	?>
+<div class="theme<?php if ( $theme['active'] ) echo ' active'; ?>" tabindex="0" aria-describedby="<?php echo $aria_action . ' ' . $aria_name; ?>">
 	<?php if ( ! empty( $theme['screenshot'][0] ) ) { ?>
 		<div class="theme-screenshot">
 			<img src="<?php echo $theme['screenshot'][0]; ?>" alt="" />
@@ -200,13 +203,13 @@
 	<?php } else { ?>
 		<div class="theme-screenshot blank"></div>
 	<?php } ?>
-	<span class="more-details"><?php _e( 'Theme Details' ); ?></span>
+	<span class="more-details" id="<?php echo $aria_action; ?>"><?php _e( 'Theme Details' ); ?></span>
 	<div class="theme-author"><?php printf( __( 'By %s' ), $theme['author'] ); ?></div>
 
 	<?php if ( $theme['active'] ) { ?>
-		<h3 class="theme-name"><span><?php _ex( 'Active:', 'theme' ); ?></span> <?php echo $theme['name']; ?></h3>
+		<h3 class="theme-name" id="<?php echo $aria_name; ?>"><span><?php _ex( 'Active:', 'theme' ); ?></span> <?php echo $theme['name']; ?></h3>
 	<?php } else { ?>
-		<h3 class="theme-name"><?php echo $theme['name']; ?></h3>
+		<h3 class="theme-name" id="<?php echo $aria_name; ?>"><?php echo $theme['name']; ?></h3>
 	<?php } ?>
 
 	<div class="theme-actions">
@@ -277,13 +280,13 @@
 	<# } else { #>
 		<div class="theme-screenshot blank"></div>
 	<# } #>
-	<span class="more-details"><?php _e( 'Theme Details' ); ?></span>
+	<span class="more-details" id="{{ data.id }}-action"><?php _e( 'Theme Details' ); ?></span>
 	<div class="theme-author"><?php printf( __( 'By %s' ), '{{{ data.author }}}' ); ?></div>
 
 	<# if ( data.active ) { #>
-		<h3 class="theme-name"><span><?php _ex( 'Active:', 'theme' ); ?></span> {{{ data.name }}}</h3>
+		<h3 class="theme-name" id="{{ data.id }}-name"><span><?php _ex( 'Active:', 'theme' ); ?></span> {{{ data.name }}}</h3>
 	<# } else { #>
-		<h3 class="theme-name">{{{ data.name }}}</h3>
+		<h3 class="theme-name" id="{{ data.id }}-name">{{{ data.name }}}</h3>
 	<# } #>
 
 	<div class="theme-actions">