diff --git src/wp-admin/includes/class-wp-terms-list-table.php src/wp-admin/includes/class-wp-terms-list-table.php
index 7d59624..ad8009b 100644
--- src/wp-admin/includes/class-wp-terms-list-table.php
+++ src/wp-admin/includes/class-wp-terms-list-table.php
@@ -325,7 +325,14 @@
 
 		$this->level = $level;
 
-		echo '<tr id="tag-' . $tag->term_id . '">';
+		if ( $tag->parent ) {
+		    $count = count( get_ancestors( $tag->term_id, $taxonomy, 'taxonomy' ) );
+		    $level = 'level-' . $count;
+		} else {
+		    $level = 'level-0';
+		}
+
+		echo '<tr id="tag-' . $tag->term_id . '" class="' . $level . '">';
 		$this->single_row_columns( $tag );
 		echo '</tr>';
 	}