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Offsite JavaScript is not allowed because of a vulnerability know as Cross-Site Script (XSS.) XSS happens when user input is improperly filtered, and <script> tags are allowed through to the user as source code.

By inserting JavaScript into a site, an attacker can gain access to information given by that site's users. Furthermore, JavaScript can be used to either divert the user to a different page, or to convince the user that a file being downloaded is from a trusted source.

See the related links for a complete explanation of XSS and how it is avoided by web programmers.

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