A video from JSConf EU 2012 in which Angelina Fabbro teaches us about the brand new shadow DOM, which is shipping now in Chrome Canary under a flag. Essentially, shadow DOM is a way for us to build modules (little sub-documents) inside a single element that are protected from the parent document. This will help semantics, make CSS easier, make more robust re-usable elements, and more. I think this will be big in years to come.
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