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

Patricia Arquette

Dec 10, 2024 pm 02:01 PM

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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