Summary & Key Takeaways ​

• WebKit has released its latest set of features for Safari 26.4.
• The update includes various new capabilities and improvements for the web platform:
  • CSS Grid Lanes — New display: grid-lanes enables masonry-style layouts natively, no JavaScript needed.
  • WebTransport — HTTP/3/QUIC-based alternative to WebSockets for low-latency bidirectional communication in games and live collaboration.
  • Keyboard Lock API — Fullscreen web apps can now capture keys like Escape, enabling proper keyboard handling for games and immersive tools.
  • Threaded scroll-driven animations — Now run on the compositor thread for smoother performance.
  • ReadableStream improvements — BYOB readers for memory-efficient binary data and for await...of async iteration support.
  • sizes attribute math functions — Responsive images can now use clamp(), min(), max() in the sizes attribute.
  • 191 bug fixes — Covering CSS zoom, SVG animation/rendering, accessibility (VoiceOver/Voice Control), and WebRTC improvements.

Our Commentary ​

While the title is generic: "just another release", it's good to see faster pace in Safari development. It seems that Webkit is the first to ship with stable implementation of Grid Lanes!