CSS3 Media Queries Not Working on Mobile Devices? Troubleshoot with HTML

If you are experiencing issues with your CSS3 media queries not working on mobile devices, there are a few troubleshooting steps you can take to resolve the issue.

  1. Check Your HTML Doctype
  2. Check Your CSS Syntax
  3. Use a Mobile Device Emulator
  4. Conclusion

Check Your HTML Doctype

First, make sure your HTML doctype is set correctly. The doctype declaration should be the first line of your HTML document and should be set to the HTML5 doctype. This ensures that your media queries are interpreted correctly by the browser.

<!DOCTYPE html>
    <!-- Your code here -->
    <!-- Your code here -->

Check Your CSS Syntax

Next, double-check your CSS syntax to ensure there are no errors that could be causing issues with your media queries. Use a CSS validator tool to check for any syntax errors and fix any issues that are found.

Use a Mobile Device Emulator

If you have checked your HTML doctype and CSS syntax and are still experiencing issues with your media queries on mobile devices, try using a mobile device emulator to test your website. This can help you identify any issues that may be specific to certain mobile devices or screen sizes.


CSS3 media queries are an important tool for creating responsive websites, but they can sometimes be tricky to troubleshoot on mobile devices. By checking your HTML doctype, CSS syntax, and using a mobile device emulator, you can identify and resolve any issues that may be preventing your media queries from working correctly.

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