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They've just announced they are making WinJS cross-platform and open source (under Apache license). Now I haven't used WinJS, I haven't ever developed a WinRT app (just a few for the Phone), but doesn't WinJS have a ton of quality components, even more so than WinRT XAML? This seems pretty awesome.

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I missed the cross platform part, I've been bouncing between the live stream and work this morning. So the claim is iOS apps with WinJS as if it had been built in Obj C with XIBs and not just a web view hosted in a native harness? If true that would be pretty amazing (it would probably also cause Xamarin to shit a brick)

No, definitely just a WebView. Still having a set of quality cross-platform MVVM-aware components for HTML5 is nice.

Oh, I misunderstood what the implications were for "cross platform" then in this context. I would never think that javascript wasn't cross platform, I'll have to look into the MVVM components but JS already has that with libraries like Knockout so obviously I need to go back and watch the keynote again.

Thanks for the clarification.

The APIs are what is now cross-platform. Previously WinJS had hooks for opening files (as one example) that obviously only worked in Windows.

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