The HTML file should be inside the wwwroot root folder. You can move the file manually inside the folder, and then edit it from the wwwroot folder. Alternatively, configure the Grunt task to copy it to the wwwroot folder using grunt-contrib-copy .
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"Microsoft.AspNet.StaticFiles": "1.0.0-beta3",
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app.UseStaticFiles();
...
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"webroot": "wwwroot",
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