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Building 3rd Party Widgets - Jonathan Julian
How does the Facebook Like button work? How do sites like Twitter offer widgets that you can embed on your own blog? In this session, we'll build our own widget for cross-domain communication, while also covering dynamic script loading, JSONP, iframe hacking, HTML5 PostMessage, etc.
Slides: slideshare.net/jonathanjulian/building-3rd-party-widgets-with-javascript