Why Does Disabling `FEATURE_NINPUT_LEGACY_MODE` Fix Web Browser Control Emulation Issues?

Unveiling the Issue behind Web Browser Control Emulation (FEATURE_BROWSER_EMULATION)

Navigating to specific web pages in a C# web browser control application might not be as straightforward as it seems, particularly with varying FEATURE_BROWSER_EMULATION settings in the registry. An intriguing query from Guy explores the root cause behind a common problem encountered when emulating browser versions with this feature.

Background:

Guy created a simple application using Visual Studio 2013 that utilizes a web browser control to access a page on the Dojo Toolkit website. When FEATURE_BROWSER_EMULATION is not set in the registry, the site functions as expected. However, setting values corresponding to IE9 emulation and above causes a malfunction.

Investigating the Problem:

The issue lies in the interplay between the FEATURE_BROWSER_EMULATION setting and the page's behavior. When Guy's application emulates IE versions below IE9, the page functions correctly, indicating compatibility with older browser standards. However, using values for IE9 and higher causes conflicts, resulting in the month date picker not working.

The Solution:

The solution involves a crucial registry setting adjustment: disabling FEATURE_NINPUT_LEGACY_MODE. This feature affects how non-client input is handled in Internet Explorer and can interfere with certain page elements, including the date picker.

Revised Implementation:

A revised implementation of Guy's application addresses the issue by disabling FEATURE_NINPUT_LEGACY_MODE:

Registry.SetValue(featureControlRegKey + "FEATURE_NINPUT_LEGACYMODE",
appName, 0, RegistryValueKind.DWord);

Conclusion:

Toggling the FEATURE_NINPUT_LEGACY_MODE setting proved instrumental in resolving the problem for Guy's application. Disabling this feature enhances the compatibility of the web browser control with modern pages and eliminates rendering issues caused by differing FEATURE_BROWSER_EMULATION values.

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