Release Notes for Safari Technology Preview 11
Safari Technology Preview Release 11 is now available for download for both macOS Sierra betas and OS X El Capitan. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions 203771–204289. JavaScript Updated behavior for a class that extends null to follow ECMAScript 2016 specifications (r204058) Made the seco
WebKit、Safari Technology Previewで改善してきた「MathML」レンダリングの変化を確認できるデモページを公開。
WebKitがSafari Technology Preview 9までに改善してきた「MathML」レンダリングの変化を確認できるデモページを公開しています。詳細は以下から。 WebKitは現地時間7月22日、W3C勧告でISO/IEC標準となっている数式用マークアップ言語 “Mathematical Markup Language (MathML)”を先日リリースしたSafari Technology Preview 9までに大幅に改善できたとしてその変化をまとめたデモページを公開しています。 We give an overview of these recent changes as well as screenshots of beautiful mathematical formulas rendered by the latest Safari Technology Previ
Release Notes for Safari Technology Preview 9
Safari Technology Preview Release 9 is now available for download for both macOS Sierra betas and OS X El Capitan. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions 202612–203152. JavaScript Improved spec compliance for Array and TypedArray (r202631, r202943, r202926, r203147, r203101, r203107, r203037
Release Notes for Safari Technology Preview 8
Safari Technology Preview Release 8 is now available for download for both macOS Sierra beta 2 and OS X El Capitan. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 8 of Safari Technology Preview covers WebKit revisions 202085–202612. JavaScript Achieved 100% ECMAScript 2015 (ES6) support by adding back Symbol.isConcatSpreadable
Improving Color on the Web
The past few years have seen a dramatic improvement in display technology. First it was the upgrade to higher-resolution screens, starting with mobile devices and then desktops and laptops. Web developers had to understand high-DPI and know how to implement page designs that used this extra resolution. The next revolutionary improvement in displays is happening now: better color reproduction. Here
WebKit、Webフォントの取り扱いに関する新しいポリシーを公開。
WebKitがWebフォントの取り扱いに関する新しいポリシーを公開しています。詳細は以下から。 WebKit開発チームは現地時間6月27日、新しいWebKitでのWebフォントの取り扱いに関する新しいポリシーと今後サポートする新しいAPIなどを説明した”Improved Font Loading“を公式ブログに公開しています。 Faster web font downloads and better font load policies with developer control in WebKit. https://t.co/WRN5QImqCM pic.twitter.com/d6mhZvDb9z — WebKit (@webkit) 2016年6月27日 Older versions of WebKit would continue to show this invisible t
Changeset 202432 – WebKit — Move WebKit2 Apple Pay code to the open source repository
Show lines around each change Show the changes in full context Timestamp: Jun 24, 2016 11:31:05 AM (8 years ago) Author: andersca@apple.com Message: Move WebKit2 Apple Pay code to the open source repository https://bugs.webkit.org/show_bug.cgi?id=159041 Reviewed by Sam Weinig. DerivedSources.make: Shared/Cocoa/WebCoreArgumentCodersCocoa.h: Added. Shared/Cocoa/WebCoreArgumentCodersCocoa.mm: Added.
Release Notes for Safari Technology Preview 7
Safari Technology Preview Release 7 is now available for download. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 7 of Safari Technology Preview covers WebKit revisions 201541–202085. JavaScript Implemented options argument to addEventListener (r201735, r201757) Updated JSON.stringify to correctly transform numeric array indice
Release Notes for Safari Technology Preview 6
Safari Technology Preview Release 6 is now available for download. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 6 of Safari Technology Preview covers WebKit revisions 201084–201541. JavaScript Added support for trailing commas in function parameters per draft ECMAScript spec (r201488) Improved RegExp matching when the result
Memory Debugging with Web Inspector
Web Inspector now includes two new timelines for debugging a webpage’s memory usage. The first is a high-level Memory timeline intended to help developers to better understand the memory characteristics of their webpages, to identify spikes, and to detect general memory growth. The second is a detailed JavaScript Allocations timeline that allows developers to record, compare, and analyze snapshots
JavaScriptCore CSI: A Crash Site Investigation Story
When debugging JavaScript bugs, web developers have Web Inspector which provides a debugger and many introspective tools to examine their code with. But when the bug is at a lower level in WebKit’s JavaScript engine, JavaScriptCore (JSC), WebKit engineers will need to use a different set of tools to diagnose the issue. Today, I’ll describe some of these tools that WebKit engineers use by telling t
Release Notes for Safari Technology Preview 5
Safari Technology Preview Release 5 is now available for download. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 5 of Safari Technology Preview covers WebKit revisions 200418–201083. JavaScript Corrected the entropy of Math.random() for the first two invocations (r201053) Corrected sticky RegExp handling when backtracking alte
ECMAScript 6 Proper Tail Calls in WebKit
Proper Tail Calls (PTC) is a new feature in the ECMAScript 6 language. This feature was added to facilitate recursive programming patterns, both for direct and indirect recursion. Various other design patterns can benefit from PTC as well, such as code that wraps some functionality where the wrapping code directly returns the result of what it wraps. Through the use of PTC, the amount of memory ne
Locking in WebKit
Back in August 2015 we replaced all spinlocks and OS-provided mutexes in WebKit with the new WTF::Lock (WTF stands for Web Template Framework). We also replaced all OS-provided condition variables with WTF::Condition. These new primitives have some cool properties: WTF::Lock and WTF::Condition only require one byte of storage each. WTF::Lock only needs two bits in that byte. The small size encoura
Updating Our Prefixing Policy
When implementing new features for the Web, it’s important for us to be able to get them into the hands of developers early, so they can give new things a try. (Of course, this also helps us identify and fix bugs!) In the past, browsers did this by using vendor-prefixed names for features. This was intended to protect the Web from the churn of spec and implementation changes. Browsers would eventu
Release Notes for Safari Technology Preview 3
Safari Technology Preview Release 3 is now available for download. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 3 of Safari Technology Preview covers WebKit revisions 199086–199865. JavaScript Added support for Symbol.isConcatSpreadable per the ES6 spec (r199397) Made RegExp constructor get the Symbol.match property to decide
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. Safari Technology Preview is a version of Safari for OS X, distributed by Apple, that includes a cutting-edge, in-development version of the WebKit browser engine. It’s a great way to test upcoming WebKit features and give feedback to the people building
Editing CSS with the Visual Styles Sidebar
For new and experienced web developers alike, CSS isn’t always the easiest to deal with. Specificity and cascade order can be complex and it can be confusing to figure out what applies to each element on the page. To make matters worse, it isn’t always clear what each property does, or what its valid values are. Sure, you could type display: block into the Styles sidebar editor, but what does that
Bare Bones Backend
The Bare Bones Backend, or B3 for short, is WebKit's optimizing JIT for procedures containing C-like code. It's currently used as the default backend for the FTL JIT inside JavaScriptCore. B3 comprises a C-like SSA IR known as "B3 IR", optimizations on B3 IR, an assembly IR known as "Air", optimizations on Air, an instruction selector that turns B3 IR into Air, and a code generator that assembles
Introducing the B3 JIT Compiler
As of r195562, WebKit’s FTL JIT (Faster Than Light Just In Time compiler) now uses a new backend on OS X. The Bare Bones Backend, or B3 for short, replaces LLVM as the low-level optimizer in the FTL JIT. While LLVM is an excellent optimizer, it isn’t specifically designed for the optimization challenges of dynamic languages like JavaScript. We felt that we could get a bigger speed-up if we combine
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