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JavaScript had a bumpy ride up to now, from its origins as a CGI-replacement, initiator of countless popups and annoying effects over the renaissance as Ajax enabler up to becoming wrapped up in libraries to work around the hell that is browser differences.
With the ubiquity of JavaScript comes a new challenge. How do we keep JavaScript safe when browsers don't really distinguish between different sources and give them all the same rights? Why do we still judge the usefulness of JavaScript by how badly browsers speak it?
Learn about some environments you can use JavaScript in securely and marvel at the magic and annoyances that are technologies that try to put a lock on the issue of JavaScript security.
As the amount of JavaScript we use on our pages increases, as does its effect on page performance. Even when browsers manage to produce the same output, how they reach that output can be very different. Some optimisations aren’t obvious, others can be easily broken by seemingly unrelated statements. So, how do we get the most out of our code?
In this session we'll challenge assumptions about performance, using practical code to demonstrate the optimisations that really make a difference, and why they make a difference.