<script>alert(0)</script>, a common string used to find XSS (Cross-site scripting) vulnerabilities on the web.

Or

Someone attempting and failing to find an XSS vulnerability in Urban Dictionary.

Hey this site takes user input lemme just... <script>alert(0)</script>
Aw damn they sanitize user input properly! :(

by justnotherguyonurbandictionary July 30, 2022

<script>alert(0)</script>

<script>alert(0)</script>

by bl4kd43m0n March 13, 2018