XSS Challenge #1

Welcome to my first XSS challenge!
This challenge's goal is to execute an alert() on this page, by following the rules.




Note: This challenge does not include X-Frame-Options header, if you would like to solve the XSS challenge that no one was able to solve it yet, you can try XSS Challenge #3 (XSS Challenge #3 has X-Frame Options set to Deny, other than that, it's as same as XSS challenge, but no one was able to solve it yet).