September 2025 Baseline monthly digest

Published: October 1, 2025 September brought major developments to Baseline. A major tooling integration and many features becoming both Newly and Widely available make this a notable month. Here's all the updates!

Browserslist now has built-in queries for Baseline targets . Previously, you used the browserslist-baseline-config npm package to use Baseline with Browserslist. This package is no longer required to use Baseline in your project's toolchains. These built-in queries allow you to specify many targets, including Baseline Widely available: You can also target Baseline Newly available: Or specify a Baseline year, starting from 2015 up to the current year.

Performance optimizations increasingly drive competitive advantages in user experience, conversion rates, and search visibility.

For example: To target downstream browsers , add with downstream to any valid Baseline query. For example: Use these built-in queries in any project that uses Browserslist, which includes most projects with modern tooling.

To see how these queries work, experiment with them on the Browserslist website . To learn more, read Browserslist now supports Baseline . The following features became Baseline Newly available in September: Additionally, twenty-one features became Baseline Widely available in September: September was a significant month for Baseline. While September was an outlier in terms of the number of features that became Baseline Widely available, these moments illustrate the cumulative impact of landing interoperable features.