Outdated HTML elements or attributes, such as <canvas>, <video>, or <audio>.CSS rules that use modern selectors or properties, like :nth-child or flexbox.JavaScript code that relies on HTML5 features or uses modern browser-specific APIs.

How do I fix: Method 2: Update CSS Rules or JavaScript Code?

Step 1: Analyze your CSS rules and update them to use compatible selectors and properties. You can use online tools, like Can I Use, to check which CSS features are supported in Internet Explorer 9.

Software⏱️ 2 min read📅 2026-06-03

How to Fix: Why does IE9 switch to compatibility mode on my website?

Q: Best Solutions to Fix ItMethod 1: Remove or Replace Incompatible Elements?

Step 1: Use the Internet Explorer Developer Tools to inspect the elements on your website and identify which ones are causing the compatibility mode issue.

IE9 switches to compatibility mode on your website due to HTML5 features not being supported in the browser. Try using the 'X-UA-Compatible' meta tag to specify the document mode.

Quick Answer: Use the 'X-UA-Compatible' meta tag with the value 'IE=9' to force IE9 to render the page in standards mode, rather than compatibility mode.

📋 Table of Contents

⚠️ Common Causes
✅ Best Solutions to Fix It
✨ Wrapping Up

IE9 switches to compatibility mode on your website due to the presence of outdated or incompatible HTML elements, CSS rules, or JavaScript code. This is often caused by the use of HTML5 features that are not supported in Internet Explorer 9.

⚠️ Common Causes

Outdated HTML elements or attributes, such as <canvas>, <video>, or <audio>.
CSS rules that use modern selectors or properties, like :nth-child or flexbox.
JavaScript code that relies on HTML5 features or uses modern browser-specific APIs.

✅ Best Solutions to Fix It

Method 1: Remove or Replace Incompatible Elements

Step 1: Use the Internet Explorer Developer Tools to inspect the elements on your website and identify which ones are causing the compatibility mode issue.

Method 2: Update CSS Rules or JavaScript Code

Step 1: Analyze your CSS rules and update them to use compatible selectors and properties. You can use online tools, like Can I Use, to check which CSS features are supported in Internet Explorer 9.

✨ Wrapping Up

By following these steps, you should be able to resolve the compatibility mode issue in Internet Explorer 9 and ensure a smooth browsing experience for your users.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid