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 implements Baseline
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:
baseline widely available
You can also target Baseline Newly available:
baseline newly available
Or specify a Baseline year, starting from 2015 up to the current year. For example:
baseline 2022
To target downstream browsers, add with downstream to any valid Baseline query. For example:
baseline widely available with downstream
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.
Baseline Newly and Widely available features in September
The following features became Baseline Newly available in September:
content-visibility<link rel="dns-prefetch">- Unsanitized HTML parsing methods
URLPatternUint8Arraybase64 and hex conversion
Additionally, twenty-one features became Baseline Widely available in September:
- Constructable stylesheets
- Fetch metadata request header
font-synthesis-small-capsfont-synthesis-stylefont-synthesis-weight- Form-associated custom elements
- Import maps
- Media query range syntax
messageerror- Notifications from service workers and installed apps
- Offscreen canvas
- Origin private file system
outlinepdfViewerEnabled- Push messages
requestAnimationFrame()in workers- Resource size
- Screen orientation
- Server timing
- Imperative slot assignment
- Fixed-width SIMD (Wasm)
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.
Interop 2026 proposals conclude
Every year, major browser vendors collaborate to determine which features to implement interoperably and which bugs to fix. The Interop Project drives this work, which is part of how features become Baseline.
As part of Interop, we solicit proposals for the next year's focus areas. For 2026, the proposals are complete, and vendors are now deciding which areas and features to focus on.
Look for more news from Google and other browser vendors in future editions of this digest and in other content here on web.dev.
Baseline Timeline quality-of-life improvements
Rick Viscomi created the Baseline timeline tool. In Chrome DevRel, we use this tool to see which features are becoming Baseline. A recent update adds useful quality-of-life improvements.
This update adds keyboard shortcuts. To see them on the website, press the ? key:
- w: filters Widely available features.
- n: filters Newly available features.
- l: filters limited availability features.
- d: filters deprecated features.
- i: filters features with interop tags.
- c: scrolls to the current month.
- r: resets all filters.
- p: toggles feature predictions.
Use these shortcuts to create a view of Baseline features that fit your criteria.
That's a wrap
That's another month down in 2025 for Baseline as the year's end approaches. If we missed anything Baseline-related, let us know to have it included in a future edition. See you next month!