Language: PHP
Label: safe
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product 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.

Code:
                $this->mode = ($this->head_pointer === null)
                    ? self::BEFOR_HEAD
                    : self::AFTER_HEAD;

                break;

                /* 15. If last is true, then set the insertion mode to "in body"
                and    abort these steps. (innerHTML case) */
            } elseif ($last) {
                $this->mode = self::IN_BODY;
                break;
            }
        }
    }