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Re:Yes, I know how to write programs. How do I *run* them? by J3L2404 on Thursday June 30, 2011 @09:27AM (#2713905)
http://jsfiddle.net/

Or

If you just want to manipulate others web pages it can be done by pasting into your browser's address bar.

javascript: code here

To make a bookmarklet paste into any bookmark address.

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