Locking in WebKit

We recently replaced all spinlocks, OS-provided mutexes, and condition variables in WebKit with the new WTF::Lock and WTF::Condition — these new primitives have some cool properties.

Release Notes for Safari Technology Preview 3

Safari Technology Preview Release 3 is now available for download.

Updating Our Prefixing Policy

WebKit’s new feature policy is to implement experimental features unprefixed, behind a runtime flag.

Release Notes for Safari Technology Preview 2

Safari Technology Preview Release 2 is now available for download.

Introducing Safari Technology Preview

Starting today, there’s a new, convenient way to see what features and improvements are coming to Safari and other applications that use WebKit.

New Web Features in Safari 9.1

Last week, a new version of Safari shipped with the release of iOS 9.3 and OS X El Capitan 10.11.4.

CSS Variables in WebKit

Learn how CSS Variables helped reduce code complexity in Web Inspector for inspiration on how to make the most of them in your projects.

Editing CSS with the Visual Styles Sidebar

For new and experienced web developers alike, CSS isn’t always the easiest to deal with.

Introducing the B3 JIT Compiler

WebKit’s FTL JIT now uses a new backend on OS X — the Bare Bones Backend, or B3 for short, replaces LLVM as the low-level optimizer.

CSS Font Features

Font features are a way to enable advanced text styles and effects as designed by the font author.

10 Years of Web Inspector

Ten years ago today we introduced the first version of Web Inspector to the world — to commemorate the date, we put together a timeline of major events and blog posts for posterity.