Why does my Web Browser control in Visual Studio malfunction when setting FEATURE_BROWSER_EMULATION to IE10 or IE11?

Web Browser Control Emulation Issues with FEATURE_BROWSER_EMULATION

Problem Description:

When using the Web Browser control in Visual Studio 2013, setting the FEATURE_BROWSER_EMULATION registry key for the application to IE10 or IE11 emulation values results in the control malfunctioning. Specifically, the month date picker on a Dojo Toolkit demo page (http://demos.dojotoolkit.org/demos/calendar/demo.html) fails to work correctly.

Solution:

The issue resides in the FEATURE_NINPUT_LEGACY_MODE registry setting. Disabling this setting, along with enabling other features via registry configuration, resolves the problem. Here's a revised solution:

const int POLL_DELAY = 250;
WebBrowser _webBrowser;

// set WebBrowser features, more info: http://stackoverflow.com/a/18333982/1768303
static void SetWebBrowserFeatures()
{
    // don't change the registry if running in-proc inside Visual Studio
    if (LicenseManager.UsageMode != LicenseUsageMode.Runtime)
        return;

    var appName = System.IO.Path.GetFileName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);

    var featureControlRegKey = @"HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\";

    Registry.SetValue(featureControlRegKey + "FEATURE_BROWSER_EMULATION",
        appName, GetBrowserEmulationMode(), RegistryValueKind.DWord);

    // enable the features which are "On" for the full Internet Explorer browser

    Registry.SetValue(featureControlRegKey + "FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION",
        appName, 1, RegistryValueKind.DWord);

    Registry.SetValue(featureControlRegKey + "FEATURE_AJAX_CONNECTIONEVENTS",
        appName, 1, RegistryValueKind.DWord);

    Registry.SetValue(featureControlRegKey + "FEATURE_GPU_RENDERING",
        appName, 1, RegistryValueKind.DWord);

    Registry.SetValue(featureControlRegKey + "FEATURE_WEBOC_DOCUMENT_ZOOM",
        appName, 1, RegistryValueKind.DWord);

    // Disable FEATURE_NINPUT_LEGACY_MODE
    Registry.SetValue(featureControlRegKey + "FEATURE_NINPUT_LEGACYMODE",
        appName, 0, RegistryValueKind.DWord);
}

With this updated configuration, the Web Browser control should now function properly with both IE10 and IE11 emulation settings for the application.

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