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Public sector web sites have the responsibility to be as inclusive as possible.


All European Commission websites must offer an optimal browsing experience on every browser which has been used by at least 2% of its total users in the last 12 months.

For 2019, the minimum browser versions that must be supported are:

  • Chrome 62.0
  • Chrome Mobile 55.0
  • Firefox 50.0
  • Internet Explorer 11.0
  • Microsoft Edge 16
  • Safari 10.0
  • Opera 52.0
  • Samsung Browser 4.0

(this data will be updated in June 2020)

The content must also be accessible to those visitors not using mainstream browsers. This means applying a progressive enhancement approach, where features not supported by the latest browsers technologies can still function without adversely affecting the user experience.
Assistive technology (screen readers or any other alternative web browsing systems) and open source operating systems (e.g. Linux, FreeBSD) should be tested even if they account for less than 2% of users.

Please note: serving W3C compliant pages is a first step to ensure high compatibility across devices.


Always check content and functionalities on different displays and operating systems. Minor differences may exist across environments and browsers, but users should be able to perform their tasks without being affected by the used device.
Depending on applicability, you should test:

  • navigation
  • forms behaviour
  • JavaScripts
  • back buttons
  • cookies
  • embedded content

In general, a website should be navigable even with scripting, images and CSS turned off.