Why Is My Website Displaying Incorrectly in IE9 Compatibility Mode?

Troubleshooting IE9 Compatibility Mode Issues

When using IE9, users may encounter unexpected website behavior, particularly with HTML5-based sites. One common problem is IE9 automatically switching to compatibility mode, even when the site complies with standards and renders correctly in other browsers.

This behavior can be attributed to several factors that influence IE9's document mode determination, including:

• User-configured compatibility settings
• Site inclusion in Microsoft's compatibility list
• Compatibility issues with specific content

Solution

To resolve this issue, consider the following solutions:

1. Disable Browser Settings:

   • Access "Tools -> Compatibility view settings" under the IE menu (press Alt to view the hidden menu).
   • Uncheck the option to render the site in compatibility mode.

2. Set Explicit Document Mode:

   • Add the following meta tag to the website's header:
     
   • Alternatively, set the HTTP header:
     X-UA-Compatible: IE=Edge
   • This forces IE9 to use its latest renderer, ensuring the site's correct display.

3. Ensure Standards Compliance:

   • Check that the website complies with web standards and renders well in other browsers.
   • Use feature-sniffing to implement browser-specific workarounds.

By implementing these solutions, you can prevent IE9 from entering compatibility mode unnecessarily and ensure the proper rendering of HTML5 websites.

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