Speedometer 3.0: The Best Way Yet to Measure Browser Performance
As announced on browserbench.org today, in collaboration with other browser engine developers, Apple’s WebKit team is excited to introduce Speedometer 3.0, a major update that better reflects the Web of today. It’s built together by the developers of all major browser engines: Blink, Gecko, and WebKit with hundreds of contributions from companies like Apple, Google, Intel, Microsoft, and Mozilla.
Badging for Home Screen Web Apps
Along with the many other features for web apps on iOS and iPadOS 16.4, WebKit now includes support for the W3C’s Badging API. This straightforward API allows web developers to badge the icon of a web app. This article explores the various features of the Badging API and how to use it, and our ongoing collaboration with W3C’s Web Applications Working Group to improve the specification. Home Screen
WebKit on GitHub!
On June 23rd, the WebKit project froze its Subversion tree and transitioned management and interaction with our source code to git on GitHub. Why git? git’s distributed nature makes it easy for not just multiple developers, but multiple organizations to collaborate on a single project. git’s local record of changes makes moving commits between branches or reverting changes simple and quick. git’s
Understanding Garbage Collection in JavaScriptCore From Scratch
JavaScript relies on garbage collection (GC) to reclaim memory. In this post, we will dig into JSC’s garbage collection system. Before we start, let me briefly introduce myself. I am Haoran Xu, a PhD student at Stanford University. While I have not yet contributed a lot to JSC, I found JSC a treasure of elegant compiler designs and efficient implementations, and my research is exploring ways to tr
Meet Web Push
Websites have many reasons to notify their users of time-sensitive or high-priority events, even if the user does not currently have the site open. This feature is called Web Push, and is enabled by the W3C standards for Push API, Notifications API, and Service Workers, all working together. WebKit now supports the relevant parts of those standards to enable Web Push. Apple has made changes to mac
Optimizing JavaScript Standard Library Functions in JSC
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
Introducing Private Click Measurement, PCM
This blog post covers a new feature called Private Click Measurement, or PCM, for measuring ad clicks across websites and from iOS apps to websites. It is part of iOS and iPadOS 14.5 betas. Motivation and Goals Classic ad attribution on the web is done with cookies carrying user or device IDs. Such attribution constitutes cross-site tracking which WebKit is committed to preventing. Websites should
Meet Face ID and Touch ID for the Web
People often see passwords are the original sin of authentication on the web. Passwords can be easy to guess and vulnerable to breaches. Frequent reuse of the same password across the web makes breaches even more profitable. As passwords are made stronger and unique, they can quickly become unusable for many users. Passwords indeed look notorious, but are passwords themselves the problem, or is it
Speculation in JavaScriptCore
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
App-Bound Domains
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
A Tour of Inline Caching with Delete
If you search for any JavaScript performance advice, a very popular recommendation is to avoid the delete operator. Today, this seems to be good advice, but why should it be vastly more expensive to delete a property than to add it? The goal of my internship at Apple this winter was to improve the performance of the delete operator in JavaScriptCore. This has given me the opportunity to learn abou
Full Third-Party Cookie Blocking and More
This blog post covers several enhancements to Intelligent Tracking Prevention (ITP) in iOS and iPadOS 13.4 and Safari 13.1 on macOS to address our latest discoveries in the industry around tracking. Cookies for cross-site resources are now blocked by default across the board. This is a significant improvement for privacy since it removes any sense of exceptions or “a little bit of cross-site track
Release Notes for Safari Technology Preview 💯
Safari Technology Preview Release 100 is now available for download for macOS Catalina and macOS Mojave. 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 254696-255473. Web Inspector Added links to Web Inspector Reference documentation (r254730) Renamed the Canvas Tab to be the G
Intelligent Tracking Prevention 2.3
Note: Read about past updates to this technology in other blog posts about Intelligent Tracking Prevention, the Storage Access API, and ITP Debug Mode. Intelligent Tracking Prevention (ITP) version 2.3 is included in Safari on iOS 13, the iPadOS beta, and Safari 13 on macOS for Catalina, Mojave, and High Sierra. Enhanced Prevention of Tracking Via Link Decoration Our previous release, ITP 2.2, foc
How Web Content Can Affect Power Usage
Users spend a large proportion of their online time on mobile devices, and a significant fraction of the rest is users on untethered laptop computers. For both, battery life is critical. In this post, we’ll talk about factors that affect battery life, and how you, as a web developer, can make your pages more power efficient so that users can spend more time engaged with your content. What Draws Po
Tracking Prevention Policy
ContentsTracking DefinitionsTypes of TrackingTracking We Will PreventPolicy CircumventionNo ExceptionsUnintended ImpactAcknowledgements This document describes the web tracking practices that WebKit believes, as a matter of policy, should be prevented by default by web browsers. These practices are harmful to users because they infringe on a user’s privacy without giving users the ability to ident
Intelligent Tracking Prevention 2.2
Note: Read about past updates to this technology in other blog posts about Intelligent Tracking Prevention, and the Storage Access API. The beta releases of iOS 12.3 and Safari on macOS Mojave 10.14.5 include an updated version of Intelligent Tracking Prevention (ITP). For purposes of developer communication, we’ll refer to it as ITP 2.2. Tracking Via Link Decoration Caps Client-Side Cookies to 1
Release Notes for Safari Technology Preview 72 | WebKit
Safari Technology Preview Release 72 is now available for download for macOS Mojave and macOS High Sierra. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS Mojave and from the Mac App Store’s Updates tab on macOS High Sierra. After updating to macOS Mojave, you may have to reinstall Safari Technology Preview. This re
Release Notes for Safari Technology Preview 66 | WebKit
Safari Technology Preview Release 66 is now available for download for macOS Mojave and macOS High Sierra. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS Mojave and from the Mac App Store’s Updates tab on macOS High Sierra. After updating to macOS Mojave, you may have to reinstall Safari Technology Preview. This re
Release Notes for Safari Technology Preview 64
Safari Technology Preview Release 64 is now available for download for macOS High Sierra and the beta of macOS Mojave. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab on macOS High Sierra and in the Software Update pane of System Preferences on macOS Mojave. This release covers WebKit revisions 234684-235171. Custom Elements Fixed the cu
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