				foreach ($rearrangedTags as $pos => $type) {
					if ($opening_tag[1] == $pos) continue;
					if ($type == 'close') $counter--;
					else $counter++;
					if ($counter == 0) {
						$pairs[] = array($opening_tag[1], $pos);
						continue 2;
					}
				}
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.