Index: src/wp-admin/includes/class-wp-ms-themes-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-ms-themes-list-table.php	(revision 36205)
+++ src/wp-admin/includes/class-wp-ms-themes-list-table.php	(working copy)
@@ -682,14 +682,14 @@
 		$stylesheet = $theme->get_stylesheet();
 
 		$class = ! $allowed ? 'inactive' : 'active';
-
-		$id = sanitize_html_class( $theme->get_stylesheet() );
-
 		if ( ! empty( $totals['upgrade'] ) && ! empty( $theme->update ) ) {
 			$class .= ' update';
 		}
 
-		echo "<tr id='$id' class='$class'>";
+		printf( '<tr class="%s" data-slug="%s">',
+			esc_attr( $class ),
+			esc_attr( $stylesheet )
+		);
 
 		$this->single_row_columns( $theme );
 
Index: src/wp-admin/includes/update.php
===================================================================
--- src/wp-admin/includes/update.php	(revision 36205)
+++ src/wp-admin/includes/update.php	(working copy)
@@ -456,7 +456,13 @@
 
 	$wp_list_table = _get_list_table('WP_MS_Themes_List_Table');
 
-	echo '<tr class="plugin-update-tr"><td colspan="' . $wp_list_table->get_column_count() . '" class="plugin-update colspanchange"><div class="update-message">';
+	if ( $wp_list_table->is_site_themes ) {
+		$active = $theme->is_allowed( 'site', $wp_list_table->site_id ) ? ' active': '';
+	} else {
+		$active = $theme->is_allowed( 'network' ) ? ' active': '';
+	}
+
+	echo '<tr class="plugin-update-tr' . $active . '" id="' . esc_attr( $theme->get_stylesheet() . '-update' ) . '" data-slug="' . esc_attr( $theme->get_stylesheet() ) . '"><td colspan="' . $wp_list_table->get_column_count() . '" class="plugin-update colspanchange"><div class="update-message">';
 	if ( ! current_user_can('update_themes') ) {
 		/* translators: 1: theme name, 2: details URL, 3: escaped theme name, 4: version number */
 		printf( __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" aria-label="View %3$s version %4$s details">View version %4$s details</a>.'),
@@ -475,7 +481,7 @@
 		);
 	} else {
 		/* translators: 1: theme name, 2: details URL, 3: escaped theme name, 4: version number, 5: update URL */
-		printf( __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" aria-label="View %3$s version %4$s details">View version %4$s details</a> or <a href="%5$s" aria-label="update %3$s now">update now</a>.' ),
+		printf( __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" aria-label="View %3$s version %4$s details">View version %4$s details</a> or <a href="%5$s" class="update-link" aria-label="update %3$s now">update now</a>.' ),
 			$theme['Name'],
 			esc_url( $details_url ),
 			esc_attr( $theme['Name'] ),