View difference between Paste ID: jHEVK8yF and wSzKBLXe

 class custom_nav_walker extends Walker_Nav_Menu {
 	function start_el(&$output, $item, $depth, $args) {
 		global $wp_query;
 		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
 
 		$class_names = $value = '';
 
 		$classes = empty( $item->classes ) ? array() : (array) $item->classes;
 		$classes[] = 'menu-item-' . $item->ID;
 
 		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
 		$class_names = ' class="' . esc_attr( $class_names ) . '"';
 
 		$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
 		$id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : '';
 
-		$output .= $indent . '<h1' . $id . $value . $class_names .'>';
+		$output .= $indent . '<l1' . $id . $value . $class_names .'>';
 
 		$attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
 		$attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
 		$attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
 		$attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
 
 		$item_output = $args->before;
 		$item_output .= '<a'. $attributes .'>';
 		$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
 		$item_output .= '</a>';
 		$item_output .= $args->after;
 
 		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
 	}
 
 	/**
 	 * @see Walker::end_el()
 	 * @since 3.0.0
 	 *
 	 * @param string $output Passed by reference. Used to append additional content.
 	 * @param object $item Page data object. Not used.
 	 * @param int $depth Depth of page. Not Used.
 	 */
 	function end_el(&$output, $item, $depth) {
-		$output .= "</h1>\n";
+		$output .= "</li>\n";
 	}
 }