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Testing your service Browser testing

The design system must be universally accessible. This means components and patterns to work on every browser and device that users access our services on.

Test for compatibility

Components and patterns don’t have to look perfect in every browser but users must be able to access and use all the information and features they need, regardless of which browser they use.

Use progressive enhancement  to give your component or pattern the best possible chance of working for the majority of your users.

Browsers to test in

You should test your component or pattern in these browsers:

Operating system Browser Version
Windows Internet Explorer 11
Edge Latest 2 versions
Chrome Latest 2 versions
Firefox Latest 2 versions
macOS Safari 12 and later
Chrome Latest 2 versions
Firefox Latest 2 versions
iOS Safari 12.1 and later
Chrome Latest 2 versions
Android Chrome Latest 2 versions
Samsung Internet Latest 2 versions

Understanding the table

“Latest 2 versions” means the latest stable version and the version immediately before that.

This list in the table is from GDS, based on usage statistics for GOV.UK and represents approximately 95% of the most popular browsers. They update it in January and June every year.

Testing with assistive technologies

You’ll also need to make sure your component or pattern works with assistive technologies 

Design for your audience

When designing your component or pattern, you should analyse your users’ choice of:

  • operating systems
  • browsers
  • browser versions
  • screen size/resolutions
  • choice of mobile device

If evidence shows that your users have specific needs or extra support requirements, you can use this to make a case for not meeting these browser requirements.

For example, components and patterns used exclusively in products that internal teams use may not need to be tailored to work on smaller viewports, as it is likely that these users will only be using the product on a desktop browser.