GoKawiilA new post on Apple’s WebKit blog outlines the new features, bug fixes, and deprecations (or rather, just one) included in Safari 26.4’s WebKit. Here are the details.
44 features, 191 fixes, and one deprecation
In a blog post published earlier today, Jen Simmons, Apple Evangelist on the Web Developer Experience team for Safari and WebKit, broke down what’s new on WebKit with Safari 26.4.
According to her:
Beyond the headliners, the heart of this release is focused on what web developers ask for most. We hear you loud and clear. Results from 2025 developer surveys made it clear you want time to catch up with new features, not be swamped with more. You want existing features to work consistently across every browser. You asked for browser engineers working on WebKit to help you by squashing bugs and closing gaps in spec coverage. That’s what this release aims to do.
When it comes to new features, the headlining addition is CSS Grid Lanes, “a long-awaited solution for building rich visual galleries and much more.” Safari 26.4 also adds support for WebTransport, “a modern alternative to WebSocket” that opens the door to “low-latency experiences like multiplayer games, live collaboration tools, and improved video conferencing.”
In addition, Safari 26.4 features better support for keyboard shortcuts with the introduction of the Keyboard Lock API, “which allows web applications to capture keyboard input that would normally be handled by the browser.” Here’s Simmons on the new API:
If you’ve ever built a game, a remote desktop client, or a creative tool, you’ve probably encountered this frustration: certain keyboard shortcuts are off-limits. Press the Escape key and you are thrown out of fullscreen mode. There’s been no way to prevent this — until now. The Keyboard Lock API lets you request access to specific keys when your application needs it. A game can now use the Escape key for its own menu system.
As for its single deprecation, the update “removes the deprecated FontFaceSet constructor from the CSS Font Loading API, aligning with a CSSWG resolution that deemed it unnecessary.”
Finally, among the 191 fixes, Safari 26.4 addresses bugs affecting SVG, tables, MathML, CSS Zoom, and more.
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