A fast, open source
web browser engine.

WebKit is the web browser engine used by Safari, Mail, App Store, and many other apps on macOS, iOS, and Linux. Get started contributing code, or reporting bugs.

Web developers can follow development, check feature status, download Safari Technology Preview to try out the latest web technologies, and report bugs.

Speedometer 2.0:
A Benchmark for Modern Web App Responsiveness

Speedometer 2.0:
A Benchmark for Modern Web App Responsiveness

In 2014, the WebKit team at Apple released Speedometer 1.0, a benchmark for web app responsiveness.

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What Spectre and Meltdown Mean For WebKit

What Spectre and Meltdown Mean For WebKit

Security researchers have recently uncovered security issues known as Meltdown and Spectre.

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Introducing WebKit Build Archives

Introducing WebKit Build Archives

Today we’re excited to roll out some improvements to how we deliver WebKit builds.

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New WebKit Features in Safari 11

New WebKit Features in Safari 11

With the release of iOS 11 and macOS High Sierra, the new Safari brings impressive performance improvements and great new WebKit features to the web.

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Designing Websites for iPhone X

Designing Websites for iPhone X

The section below about safe area insets was updated on Oct 31, 2017 to reflect changes in the iOS 11.2 beta.

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Concurrent JavaScript:
It can work!

Concurrent JavaScript:
It can work!

With the recent addition of SharedArrayBuffer, concurrency is finding its way into the JavaScript language.

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Release Notes for Safari Technology Preview 38

Release Notes for Safari Technology Preview 38

Safari Technology Preview Release 38 is now available for download for macOS Sierra and betas of macOS High Sierra.

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Speedometer 2.0:
A Benchmark for Modern Web App Responsiveness

Speedometer 2.0:
A Benchmark for Modern Web App Responsiveness

In 2014, the WebKit team at Apple released Speedometer 1.0, a benchmark for web app responsiveness.

Read more