Why Does My Website Force IE9 Compatibility Mode Despite Being Disabled?

IE9 Compatibility Mode Dilemma on Specific Website

Internet Explorer 9 (IE9) is causing a peculiar issue on a particular website (http://alliancesatwar.com/guide/), switching to compatibility mode even when disabled manually. This behavior is puzzling, as other similar websites from the same author (http://geuze.name/basement/) render correctly.

Potential Causes

IE9's compatibility mode is typically triggered when a website fails to meet specific standards. Several factors can influence this, including:

• X-UA-Compatible header/meta
• User preferences for compatibility mode
• Intranet settings
• Microsoft's internal whitelist of websites requiring compatibility mode

Solution

To resolve this issue and ensure your website renders correctly in IE9, consider the following:

• Manually Disable Compatibility Mode: If possible, temporarily disable compatibility mode in IE9's "Tools -> Compatibility View Settings" menu (accessible by pressing Alt). This should allow you to assess the website's true rendering behavior.
• X-UA-Compatible Header/Meta: If your website adheres to standards, implement the following header or meta tag:

<meta http-equiv="X-UA-Compatible" content="IE=Edge">

This instructs IE9 to use its latest rendering engine.

• HTTP Header: Alternatively, you can set the following HTTP header:

X-UA-Compatible: IE=Edge

By specifying "Edge," you are instructing IE9 to render the website using its current version. This approach ensures your website will always use the most up-to-date rendering mechanisms available in IE9.

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