Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 29039)
+++ wp-admin/includes/template.php	(working copy)
@@ -1281,7 +1281,7 @@
 		return;
 
 	foreach ( (array) $wp_settings_fields[$page][$section] as $field ) {
-		echo '<tr>';
+		echo '<tr class="' . esc_attr( $field['id'] ) . '">';
 		if ( !empty($field['args']['label_for']) )
 			echo '<th scope="row"><label for="' . esc_attr( $field['args']['label_for'] ) . '">' . $field['title'] . '</label></th>';
 		else