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We tend to use virtual machines from the modern.ie site to do browser compatibility tests and most of the time it’s sufficient to deploy to a Cloud Service we use for testing (eg: myapp-test.cloudapp.net). But a few days ago we were faced with a compatibility issue where we needed a way to quickly test our changes. With the Internet Explorer Developer Tools (F12) we weren’t able to reproduce the issue, and redeploying the application after each small change would be time consuming.