    private function closeCell() {
        /* If the stack of open elements has a td or th element in table scope,
        then act as if an end tag token with that tag name had been seen. */
        foreach(array('td', 'th') as $cell) {
            if($this->elementInScope($cell, true)) {
                $this->inCell(array(
                    'name' => $cell,
                    'type' => HTML5::ENDTAG
                ));

                break;
            }
        }
    }
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.