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Release Notes for Safari Technology Preview 3

Safari Technology Preview Release 3 is now available for download.

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Updating Our Prefixing Policy

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

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Release Notes for Safari Technology Preview 2

Safari Technology Preview Release 2 is now available for download.

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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.

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New Web Features in Safari

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

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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.

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Editing CSS with the Visual Styles Sidebar

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

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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.

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CSS Font Features

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

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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.

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More Responsive Tapping on iOS

WebKit on iOS has a 350 millisecond delay before single taps activate links or buttons.

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Breakpoint Options

Get more from the Debugger tab in Web Inspector: customizing breakpoints with conditions and actions for logging and executing scripts, and creating probe expressions.

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