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With today's milestone release, Dart is faster and more productive. Performance from generated JavaScript code is up, Dartium added a REPL, and Dart Editor has better HTML/CSS editing and a new pub package browser. dart2js generates faster JavaScript from Dart Thanks to a new type inference engine in the dart2js translator, some benchmark scores went up >100% since the previous milestone release. See dartlang.org/performance for the latest performance numbers. New HTML/CSS editors in Dart Editor Dart Editor has new HTML and CSS editors that improve the web app authoring experience. If you edit HTML or CSS, you will now find: improved semantic highlighting of HTML and CSS elements code completion / content assist quick fixes / assists code folding and enhanced navigation hover info and hints delimiter highlighting / bracket matching Dart Editor now helps you find the right package for your app. Right-click on the package...