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It resizes the textarea when moving the div.grippie. How?

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They use TextAreaResizer.

You can find the Stack Exchange version on their Development CDN as part of

wmd.en.js

In that source from jquery.textarearesizer.js onward you'll find:

jQuery TextAreaResizer plugin
Created on 17th January 2008 by Ryan O'Dell 
Version 1.0.4

The current internal SE version is

1.0.5 Fixed a bug in dynamic html and IE7 - Geoff Dalgas

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