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Safari Technology Preview Release 141 is now available for download for macOS Big Sur and of macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 288438-289213. Note: Tab Groups do not sync in this release. Web Inspector Sources Tab Enabled automatic collapsing of bla

It is very common for an application to interact with local files. For example, a general workflow is opening a file, making some changes, and saving the file. For web apps, this might be hard to implement. It is possible to simulate the file operations using IndexedDB API, an HTML input element with “file” type, an HTML anchor element with the download attribute, etc, but that would require good

Although the alert, confirm and prompt JavaScript methods are convenient, they aren’t recommended due to their script-blocking behavior. That’s why we worked with other browser vendors to drive improvements to the <dialog> specification over the last few years. The most important conversations involved accessibility. You can find more complex use-cases, like payment dialogs, on the web. They are c

Safari Technology Preview Release 138 is now available for download for macOS Big Sur and macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 286534-286944. Note: Tab Groups do not sync in this release. Web Inspector Elements Tab Added support for Cascade Layers in t

The internet has always been about communication and collaboration. It started with asynchronous messages made of text. As it matured, the internet became real-time. Then the web came along, adding images, and later, video. Websites provided a means to publish, to broadcast, to run stores, to gather communities and create worlds. Now, the web is maturing to the point where web apps make rich colla

Safari Technology Preview Release 135 is now available for download for macOS Big Sur and macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 284370-285101. Note: Tab Groups do not sync in this release. Web Inspector and Web Driver Fixed “testForLinkLabels” Accessibi

After three years working on JavaScriptCore (JSC), I recently had the opportunity to work on optimizing one of our standard library functions for the first time. I thought it’d be interesting to share what I learned about how they work in JSC and how we make them faster. How are standard library functions implemented in JSC? The JavaScript standard library functions include all the prototype funct

Safari Technology Preview Release 126 is now available for download for macOS Big Sur and betas of macOS Monterey. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. Many of the new Safari 15 features are now available in Safari Technology Preview 126: Streamlined tab bar. Use Tab Groups to save and organize your tabs

Safari Technology Preview Release 118 is now available for download for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 270230-270749. Web Inspector Elements Added an experimental Font details sidebar panel for showing information about the curr

CSS Transforms appeared on the Web along with CSS Animations and CSS Transitions to add visual effects and motion on the Web. Those technologies have been a staple of the Web platform and Web developers’ toolkit for well over a decade. In fact, the CSS transform property first shipped in Safari all the way back in July 2008 when iPhone OS 2.0 shipped. You can find some historical posts about initi

Safari Technology Preview Release 116 is now available for download for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 267959-268651. Web Extensions Added support for non-persistent background pages Fixed browser.tabs.update() to accept calls w

With the release of Safari 14 for macOS Big Sur, iPadOS 14, iOS 14, and watchOS 7, WebKit brings significant improvements to performance and privacy along with a host of new features for web developers. Take a look at all of the improvements WebKit is adding with the release of Safari 14. Safari Web Extensions This release brings support for Safari Web Extensions. They are a type of extension prim

This blog post covers several enhancements to Intelligent Tracking Prevention (ITP) in Safari 14 on macOS Big Sur, Catalina, and Mojave, iOS 14, and iPadOS 14 to address our latest discoveries in the industry around tracking. CNAME Cloaking Defense ITP now caps the expiry of cookies set in so-called third-party CNAME-cloaked HTTP responses to 7 days. On macOS, this enhancement is specific to Big S

Safari Technology Preview Release 115 is now available for download for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 267325-267959. Web Inspector Sources Tab Added a checkbox to the popover when configuring a local override to allow it to ski

Safari Technology Preview Release 114 is now available for download for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 265893-267325. Web Inspector Elements Tab Changed to grey out properties that aren’t used or don’t apply (r266066) Changed to

This post is all about speculative compilation, or just speculation for short, in the context of the JavaScriptCore virtual machine. Speculative compilation is ideal for making dynamic languages, or any language with enough dynamic features, run faster. In this post, we will look at speculation for JavaScript. Historically, this technique or closely related variants has been applied successfully t

Safari Technology Preview Release 110 is now available for download for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 263214-263988. WebRTC Added a functional WebRTC VP9 codec (r263734, r263820) Allowed registering VP9 as a VT decoder (r263894

ContentsTerminologyThe Default Cookie PolicyPrivate Browsing ModePartitioned Third-Party StoragePartitioned Service WorkersPartitioned Third-Party HTTP CacheAnti FingerprintingIntelligent Tracking Prevention (ITP) WebKit has implemented tracking prevention technologies, spanning from 2003 with Safari 1.0 until today. Most of them are on by default. This document describes shipping behavior includi

Many applications use WKWebView as a convenient way to display websites without requiring users to leave the app, referred to as in-app browsing. Although this can provide a great user experience, the powerful features available to developers using WKWebView allow a hosting app to monitor users across all of the sites they visit within the app. Powerful WKWebView features, such as JavaScript injec