Baseline

Baseline gives you clear information about which web platform features work across our core browser set today. When reading an article, or choosing a library for your project, if the features used are all part of Baseline, you can trust the level of browser compatibility. By aligning with Baseline, there should be fewer surprises when testing your site.

How features become part of Baseline

Baseline features are available across popular browsers. Baseline has two stages:

• Newly available:

  The feature works across the latest devices and browser versions. The feature might not work in older devices or browsers. Indicated with a blue icon.

• Widely available:

  The feature is well established and works across many devices and browser versions. It's been available across browsers for at least 2½ years (30 months). Indicated with a green icon.

Prior to being newly available, a feature has Limited availability when it's not yet available across all browsers.

The core browser set

Baseline is calculated using the following core browser set:

• Apple Safari (macOS and iOS)
• Google Chrome (desktop and Android)
• Microsoft Edge (desktop)
• Mozilla Firefox (desktop and Android)

Other browsers

Many browsers outside the core browser set typically support the same Baseline feature set as a browser in the core browser set.

For example, many browsers on Android, Windows, and macOS are built on Chromium, the open source engine underpinning Chrome and Edge. On iOS, all browsers use the same engine, WebKit, that underpins that device's Safari browser.

For a wider range of browsers, see supported browsers to find out which minimum browser versions support different Baseline feature sets, including Newly and Widely available and Baseline years.

The baseline-browser-mapping module tracks these mappings to derive the feature set for browsers outside the core browser set.

Find the Baseline status of a feature

You can find at-a-glance Baseline statuses on Can I Use feature entries, and MDN Web Docs reference pages.

See Baseline in the wild for more examples.

You can use Baseline on your site too.

Baseline ownership and maintenance

The Baseline definition is written and maintained by the web-features owners group.

Feature definitions are created and reviewed by web-features owners, peers, and contributors.

This work is coordinated and supported by members of the WebDX Community Group.

Learn more

To learn more about the background of Baseline, its goals, audience, and more, see the full Baseline definition.