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JavaScript allows the site to respond dynamically as you click on various buttons and text throughout the site.

Enabling JavaScript does not pose a significant risk to your computer's security. All browsers force:

1. JavaScript to run in a 'sandbox' in which it can only perform Web-related actions, not general-purpose programming tasks like creating files.
2. Scripts to be constrained by the same origin policy: scripts from one Web site do not have access to information such as usernames, passwords, or cookies sent to another site.

You can learn more about JavaScript from Wikipedia.

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