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The following are the four different IE 10 runtime environments that are present in Windows 8.
IE Start Screen Mode (Formerly known as Metro)
The runtime environment of the Internet Explorer app which is present in the Windows 8 Start screen mode, which is the default GUI.
"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0; .NET4.0E; .NET4.0C)"
- More restrictive than IE Desktop.
- Limited and restricted support for plugins (i.e., no ActiveX, Flash, Silverlight, etc.)
IE Desktop Mode
The runtime environment of the Internet Explorer app which is present in the Windows 8 Desktop mode, which is the transitional Windows interface.
"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; .NET4.0E; .NET4.0C)"
WebView (within Native Windows 8 App)
WebViews are useful for building hybrid apps that, for example, combine a native C# Windows app with web-based content rendering.
While testing YUI in the IE 10 WebView runtime, we noticed the following restrictions:
- Locked down compared to Internet Explorer
Microsoft describes the WebView restrictions in detail on its MSDN website.
Native Windows Runtime (Windows Store apps)
The native Windows Runtime is both a restricted IE 10 runtime, and is extended via the native
WinJS APIs. While testing YUI in the native Windows Runtime, we noticed the following differences:
- Environment is only available to native Windows 8 apps.
- No support for JSONP.
- Extended with both Windows and WinJS APIs, allowing apps to use device functionality (e.g., camera, clipboard, geolocation, etc.)
- Support for CORS in XMLHttpRequest.
- WinJS.xhr is a wrapper which uses promises.
- IFrame support is unpredictable.