For example, take a screenshot of a full page after scrolling down to the bottom. The script to scroll down is located at http://browshot.com/static/js/custom/scrolldown.js. The script will be loaded and executed within the page after the page load event.
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Browshot is a web service to create real time web screenshots in a multitude of virtual devices, including mobile devices like the iPhone 3 & 4, iPad, Android Nexus, etc.
Real time screenshots
15+ mobile devices: iPhone, iPad, Android, etc.
30+ desktop resolutions
Fast and reliable
Thumbnails of any size, any ratio
Full API, open-source libraries