February 16th, 2023… also brings the first beta of Safari 16.4. It’s a huge release, packed with over 135 features in WebKit — including RegExp lookbehind assertions, Import Maps, OffscreenCanvas, Media Queries Range Syntax, @property, font-size-adjust, Declarative Shadow DOM, and much more. We’ll write all about these new WebKit features when Safari 16.4 is released to the public. Meanwhile, you can read a comprehensive list of new features and fixes in the Safari 16.4 beta 1 release notes.