WebKit@webkit

Official Twitter account for the WebKit Open Source Project — the web browser engine that powers Safari and other apps on macOS, iOS, Windows, and Linux.

webkit.org
Joined April 2008
Minutes away from the Web Extensions Q&A at 2 PM (PDT). Bring your questions about: → Content blockers → Modifying webpage content → Extension-to-app communication → Packaging and distribution Get answers from Apple engineers. developer.apple.com/forums/a… #wwdc26 #safari
Web Extensions Q&A Connect with Apple engineers in the Web Extensions Q&A on the Apple Developer Forums. June 10, 2026 2:00 PM - 4:00 PM (PDT) Register now >

ALT Web Extensions Q&A Connect with Apple engineers in the Web Extensions Q&A on the Apple Developer Forums. June 10, 2026 2:00 PM - 4:00 PM (PDT) Register now >
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Today at 2 PM Pacific: Apple engineers answer your Web Extensions questions live for 2 hours. Got questions about: blocking content, modifying webpages, communicating with your native app, packaging and distributing extensions? developer.apple.com/forums/a… #wwdc26 #safari #web
Web Extensions Q&A Connect with Apple engineers in the Web Extensions Q&A on the Apple Developer Forums. June 10, 2026 2:00 PM - 4:00 PM (PDT) Register now >

ALT Web Extensions Q&A Connect with Apple engineers in the Web Extensions Q&A on the Apple Developer Forums. June 10, 2026 2:00 PM - 4:00 PM (PDT) Register now >

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The Spatial Web Q&A is live right now on the Apple Developer Forums. Ask your questions, browse what others are asking, and get answers from Apple engineers in minutes. #wwdc26 #safari #visionos Jump in → developer.apple.com/forums/a…
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In one hour the Spatial Web Q&A goes live on the Apple Developer Forums. If you're working on web content for visionOS, WebXR, the HTML Model Element, immersive web environments, this is your chance to get answers directly from Apple engineers. #wwdc26 developer.apple.com/forums/a…
Spatial Web Q&A Connect with Apple engineers in the Spatial Web Q&A on the Apple Developer Forums. June 10, 2026 | 9:00 AM - 11:00 AM (PDT)
Register now >

ALT Spatial Web Q&A Connect with Apple engineers in the Spatial Web Q&A on the Apple Developer Forums. June 10, 2026 | 9:00 AM - 11:00 AM (PDT)
Register now >
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Release notes are available for Safari Technology Preview 220 with updates to CSS, DOM, JavaScript, Media, Rendering, Web Animations, Web API, Web Inspector, and WebRTC. webkit.org/blog/16973/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Release notes are available for Safari Technology Preview 219 with updates to Canvas, CSS, JavaScript, Media, Rendering, Web API, Web Extensions, and WebRTC. webkit.org/blog/16961/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Release notes are available for Safari Technology Preview 218 with updates to CSS, JavaScript, Lockdown Mode, Rendering, SVG, Web API, Web Extensions, Web Inspector, and WebRTC. webkit.org/blog/16861/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari 18.4 is here! webkit.org/blog/16574/webkit…
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Release notes are available for Safari Technology Preview 210 with updates to CSS, DOM, JavaScript, Rendering, Web Animations, Web API, Web Extensions, and Web Inspector. webkit.org/blog/16406/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari 18.2 is here! For web developers, it’s the biggest release of new features this year. webkit.org/blog/16301/webkit…
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Release notes are available for Safari Technology Preview 209 with updates to the Browser, CSS, Rendering, Scrolling, SVG, Text, Web API, Web Extensions, and Web Inspector. webkit.org/blog/16296/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Release notes are available for Safari Technology Preview 208 with updates to CSS, JavaScript, Rendering, Scrolling, Web API, Web Authentication, Web Extensions, Web Inspector, and WebRTC. webkit.org/blog/16285/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Release notes are available for Safari Technology Preview 207 with updates to Accessibility, CSS, Forms, JavaScript, Loading, Networking, Rendering, Scrolling, Web Extensions, and Web Inspector. webkit.org/blog/16205/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 204 is now available with updates to Accessibility, CSS, Forms, JavaScript, Service Workers, Web API, Web Driver, Web Extensions, and Web Inspector. webkit.org/blog/15978/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 203 is now available with updates to Accessibility, Canvas, CSS, Editing, JavaScript, Media, Networking, Rendering, SVG, Web API, Web Apps, Web Assembly, Web Extensions, and Web Inspector. webkit.org/blog/15860/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 202 is now available with updates to Accessibility, CSS, Editing, JavaScript, Media, Rendering, SVG, Web Animations, Web API, Web Assembly, and WebDriver. webkit.org/blog/15798/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 201 is now available with updates to CSS, DOM, JavaScript, Media, PDF, Rendering, SVG, Web Animations, and Web Extensions. webkit.org/blog/15790/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 200 🎉 with support for macOS Sequoia beta is now available with updates to CSS, JavaScript, Networking, Rendering, and Web Extensions. webkit.org/blog/15779/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 199 with support for macOS Sequoia beta is now available with updates to Apple Pay, CSS, Editing, JavaScript, Media, Rendering, Text, and WebRTC. webkit.org/blog/15735/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 198 with support for macOS Sequoia beta is now available with updates to CSS, Forms, JavaScript, Media, Rendering, Safari Extensions, SVG, Web API, Web Inspector, and WebRTC. webkit.org/blog/15694/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 197 with support for macOS Sequoia beta is now available with updates to Canvas, CSS, Forms, JavaScript, Media, Rendering, Security, SVG, Web Inspector, WebDriver, and WebGL. webkit.org/blog/15687/releas…
Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sequoia featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 196 is available with updates to Canvas, CSS, JavaScript, Web API, Web Inspector, WebGL, and WebRTC. webkit.org/blog/15429/safari…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 195 is available with updates to Accessibility, CSS, Media, Rendering, Scrolling, Web Extensions, and Web Inspector. webkit.org/blog/15417/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 194 is available with updates to Accessibility, Canvas, CSS, JavaScript, Networking, Rendering, SVG, Web Animations, Web API, Web Extensions, and WebGL. webkit.org/blog/15406/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 192 is available with updates to Authentication, CSS, Editing, JavaScript, Media, Rendering, Web API, Web Extensions, and Web Inspector. webkit.org/blog/15260/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Today we’re excited to announce Speedometer 3 in collaboration with @googlechrome, @Firefox, & @MicrosoftEdge. This benchmark measures speed & guides browser teams as they make websites & web apps run faster than ever — now with a new generation of tests. webkit.org/blog/15131/speedo…
Complex DOM workloads has ribbon menus, side bar tree view, search field, and other complex UI elements surrounding the todo app.

ALT Complex DOM workloads has ribbon menus, side bar tree view, search field, and other complex UI elements surrounding the todo app.

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Safari Technology Preview 190 is available with updates to Authentication, CSS, History, HTML, JavaScript, Media, Networking, Rendering, SVG, URLs, Web API, and Web Inspector. webkit.org/blog/15127/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Jen Simmons was a guest on @kevinJPowell’s YouTube channel on CSS, talking about all things CSS, Safari, how web standards for new technology are made, `font-size-adjust`, `margin-trim`, `text-box-trim`, `text-box-edge` and much more. piped.video/watch?v=nn3vYS_m…
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Safari Technology Preview 186 is available with updates to CSS, Forms, HTML, JavaScript, Rendering, Service Workers, Web Animations, and Web API. webkit.org/blog/14916/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 185 is available with updates to Accessibility, CSS, Media, Rendering, Web API, Web Inspector, WebAuthn, and WebGPU. webkit.org/blog/14885/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 182 is available with updates to CSS, Forms, HTML, JavaScript, Loading, Media, Rendering, Scrolling, Storage, SVG, Text, Web API, Web Assembly, Web Inspector, and WebRTC. webkit.org/blog/14764/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 181 is available with updates to CSS, HTML, JavaScript, Media, Rendering, and SVG. webkit.org/blog/14721/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 180 is available with updates to Accessibility, CSS, JavaScript, Loading, Media, Web Animations, and Web API. webkit.org/blog/14532/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 179 is now available with updates to Web Inspector, CSS, HTML, HTTP, Media, SVG, Web API, and Web Inspector. webkit.org/blog/14532/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 177 is now available with updates to Web Inspector, CSS, Rendering, Popover, Media, JavaScript, Web API, Accessibility, and Apple Pay. webkit.org/blog/14412/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 176 is now available with updates to CSS, Rendering, Accessibility, Media, and Web API. webkit.org/blog/14401/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 175 is now available with updates to Accessibility, CSS, Media, Web API, and Web Inspector. webkit.org/blog/14398/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 174 is now available with updates to CSS, CSS Container Queries, Layout, JavaScript, Media, Popover, Accessibility, SVG, Web API, and WASM. webkit.org/blog/14390/releas…
Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Sonoma featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 172 is now available with updates to Web Inspector, CSS, Image Set, Rendering, Editing, JavaScript, Media, Popover, SVG, Accessibility, HTML, IndexedDB, and Web API. webkit.org/blog/14372/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Responsive Design mode got a redesign in Safari 17. developer.apple.com/document…
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The Develop menu is where you can access websites in Safari, Web apps, Service workers, and more for each device you have (Mac, iPad, iPhone), and for device simulators (including Vision Pro soon). developer.apple.com/document…
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Safari Technology Preview 171 is now available with updates to Web Inspector, CSS, CSS Counter Styles, Web Animations, Rendering, JavaScript, Popover, Web API, and more. webkit.org/blog/14200/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 170 is now available with updates to CSS, Layout, JavaScript, Media, Popover, and Accessibility. webkit.org/blog/14167/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 169 is now available with updates to Web Inspector, CSS, Scroll Snap, JavaScript, Popover, SVG, Accessibility, and more. webkit.org/blog/14135/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.
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Safari Technology Preview 168 is now available with updates to Web Inspector, CSS, Rendering, Web Animations, JavaScript, Lockdown Mode, Media, Popover, and more. webkit.org/blog/14106/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 166 is now available with updates to Web Inspector, CSS, JavaScript, Popover, Media, Web API, and more. webkit.org/blog/13964/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Learn how to enable inspection of web content in your apps using the new inspectable API and Web Inspector in Safari on the WebKit blog. webkit.org/blog/13936/enabli…
Safari Develop Menu showing Patrick's iPhone selected and a sub-menu with JSContext and www.example.com web content under an Example App heading.

ALT Safari Develop Menu showing Patrick's iPhone selected and a sub-menu with JSContext and www.example.com web content under an Example App heading.

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Safari Technology Preview 165 is now available with updates to Web Inspector, CSS, JavaScript, Layout, Media, Forms, Web Animations, and more. webkit.org/blog/13932/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 164 is now available with updates to Web Inspector, CSS, JavaScript, ResizeObserver, Web Animations, Web API, and more. webkit.org/blog/13902/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle over a purple background with white radial marks.

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Safari Technology Preview 163 is now available with updates to Web Inspector, Masonry Layout, CSS Custom Properties, `:has()` improvements, CSS, JavaScript, WebAssembly, Gamepad API, Web API, and much more. webkit.org/blog/13839/releas…
Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle angled over a purple background with white radial tick marks.

ALT Safari Technology Preview app icon on macOS Ventura featuring a red and white compass needle angled over a purple background with white radial tick marks.

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The WebKit team is proud to have reached a 98.2% Interop 2022 test pass-rate by the end of December. See all the details at wpt.fyi/interop-2022?stable
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It’s great to see results of Interop 2022 in the new dashboard design. wpt.fyi/interop-2022?stable See just how successful the project has been by looking at the green “Interop” line on this graph — the number of tests that pass in all three browsers increased from 49% to 83%!
Graph of the Interop test pass rate, from Jan to Dec 2022. Also at: https://wpt.fyi/interop-2022?stable

ALT Graph of the Interop test pass rate, from Jan to Dec 2022. Also at: https://wpt.fyi/interop-2022?stable

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