Web Platform Baseline brings clarity to information about browser support for web platform features.

Baseline gives you clear information about which web platform features are ready to use in your projects 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 no surprises when testing your site. More about Baseline.

Baseline has two stages:

  • Newly available: The feature becomes supported by all of the core browsers, and is therefore interoperable.
  • Widely available: 30 months has passed since the newly interoperable date. The feature can be used by most sites without worrying about support.
  • Chrome (desktop and Android)
  • Edge
  • Firefox (desktop and Android)
  • Safari (macOS and iOS)
All items that become part of Baseline Newly Available in 2023 can be referred to as Baseline 2023. We published a post at the end of 2023 to round up all the features that landed during the year.
Baseline 2023 features
There are still many browser releases to come in 2024, however there are already plenty of features that are part of Baseline 2024. Follow along as we announce new features throughout the year.
Baseline 2024 features
Size container queries became Baseline Newly Available in February 2023.
:has() became Baseline Newly Available in December 2023.
Subgrid became Baseline Newly Available in September 2023.
Nesting became Baseline Newly Available in August 2023.
The <search> element became Baseline Newly Available in October 2023.
Responsive video became Baseline Newly Available in November 2023.
The inert attribute became Baseline Newly Available in April 2023.
The Constraint Validation API became Baseline Newly Available in March 2023.
:user-valid and :user-invalid became Baseline Newly Available in October 2023.
Compression Streams became Baseline Newly Available in May 2023.
The Declarative Shadow DOM became Baseline Newly Available in February 2024.
Popover became Baseline Newly Available in April 2023.

Where to find Baseline

Check the Baseline status of a property on MDN.
Find Baseline on MDN
Check Baseline status on Can I Use to see if a feature is ready for use.
Visit Can I Use
Use Baseline to clarify feature status in your articles and presentations.