Jen Simmons introduces 44 new features including grid lanes for masonry-style layouts, WebTransport for low-latency bidirectional communication, and the Keyboard Lock API for capturing browser shortcuts in fullscreen. The release also adds name-only container queries, threaded scroll-driven animations, ReadableByteStream, and improvements to layout engines, Web Inspector, and accessibility. Plus 191 bug fixes.
WebKit features for Safari 26.4
