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IE 11, Set Compatibility Through Meta Data, JavaScript Code, or IIS Custom Header or Web.Config

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This IE 11 (desktop version) drives me crazy.  We have a production site which holds all those legacy codes accumulated for many years. There were compatibility issues before since IE 10, but we can manage to usinghttp-equiv="X-UA-Compatible" content="IE=9" to resolve the issues and management has been happy about it. After some end-user updated to Windows 8.1 and using IE 11, the production site stops working which end users only see a blank page! (I do know to let the user to go to Tools -- Compatibility View Settings to add our site to compatibility list, but this is not the solution for most of the users. When most of users see blank page, users start to panic).  While I realize that there are many bad coding practices in the application, but refactoring codes cannot be happened in one night, it will take time and end-users can not wait. I simply want toIE 11 supports the same features or give some documents which allow developers to work around the issues(Like using meta data to support compatibility features or any methods which can support such features). But IE 11 provides neither. I have been trying to find documents and related topics or those solutions, none of them work (tried: through Meta Data as mentioned above, JavaScript Code, or IIS Custom Header or Web.Config). Even worse, the IE 11F12 tool is also not working consistently with Compatibility View Settingstool. When legacy site is set through Compatibility View Settingstool, the site is working. When I use F12 to switch among different version of IEs, none of them work. As developer, I am really frustrated, because I think this is such important and fundamental features (there are lots of old legacy web apps out there, but end-users update to IE11), IE 11 should take care of it at minimum. Can this forum send our frustration to Microsoft IE team???

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