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Test the Web Forward brings you closer to the very specifications that you use to craft web experiences and has you discover how you can shape the future of the web.
Over the course of the event, not only will you learn to understand how to read specifications and understand the state of support among different browsers, but you will also create robust tests along with the editors of various standards to ensure browsers implement these features consistently. At the end of it, you will gain a deeper understanding of browser internals & how you can write clear, robust tests.
As a side note, there is also a Brackets Hackathon going on tomorrow in London. You don't have much time to register, but there are still seats (free seats of course) available.