WebKit is a browser engine developed by Apple and primarily used in its Safari web browser, as well as all the iOS web browsers. WebKit is also used by the BlackBerry Browser, the Tizen mobile operating systems, and a browser included with the Amazon Kindle e-book reader. WebKit's C++ application programming interface (API) provides a set of classes to display Web content in windows, and implements browser features such as following links when clicked by the user, managing a back-forward list, and managing a history of pages recently visited.
The WebKit logo, as of 2015
|Developer(s)||Apple Inc., Adobe Systems, KDE, Igalia, and others|
|Initial release||November 4, 1998 (KHTML released)|
June 7, 2005 (WebKit sourced)
|Operating system||macOS, Linux|
According to Apple, some changes involved OS X-specific features (e.g., Objective-C, KWQ, OS X calls) that are absent in KDE's KHTML, which called for different development tactics.
The exchange of code between WebCore and KHTML became increasingly difficult as the code base diverged because both projects had different approaches in coding and code sharing. At one point KHTML developers said they were unlikely to accept Apple's changes and claimed the relationship between the two groups was a "bitter failure". Apple submitted their changes in large patches containing very many changes with inadequate documentation, often to do with future additions. Thus, these patches were difficult for the KDE developers to integrate back into KHTML. Also, Apple had demanded that developers sign non-disclosure agreements before looking at Apple's source code and even then they were unable to access Apple's bug database.
During the publicized "divorce" period, KDE developer Kurt Pfeifle (pipitas) posted an article claiming KHTML developers had managed to backport many (but not all) Safari improvements from WebCore to KHTML, and they always appreciated the improvements coming from Apple and still do so. The article also noted Apple had begun to contact KHTML developers about discussing how to improve the mutual relationship and ways of future cooperation. In fact, the KDE project was able to incorporate some of these changes to improve KHTML's rendering speed and add features, including compliance with the Acid2 rendering test.
Following the story of the fork's appearance in the news, Apple released changes of the source code of WebKit fork in a public revision-control repository. Since the transfer of the source code into a public Concurrent Versions System (CVS) repository, Apple and KHTML developers have had increasing collaboration. Many KHTML developers have become reviewers and submitters for WebKit revision control repository.
The WebKit team had also reversed many Apple-specific changes in the original WebKit code base and implemented platform-specific abstraction layers to make committing the core rendering code to other platforms significantly easier.
In July 2007, Ars Technica reported that the KDE team would move from KHTML to WebKit. Instead, after several years of integration, KDE Development Platform version 4.5.0 was released in August 2010 with support for both WebKit and KHTML, and development of KHTML continues.
In mid-December 2005, support for Scalable Vector Graphics (SVG) was merged into the standard build and in early January 2006 the source code was migrated from Concurrent Versions System (CVS) to Subversion (SVN).
Beginning in early 2007, the development team began to implement Cascading Style Sheets (CSS) extensions, including animation, transitions and both 2D and 3D transforms; such extensions were released as working drafts to the World Wide Web Consortium (W3C) in 2009 for standardization.
In November 2007, the project announced that it had added support for media features of the HTML5 draft specification, allowing embedded video to be natively rendered and script-controlled in WebKit.
The week after Hyatt announced WebKit's open-sourcing, Nokia announced that it had ported WebKit to the Symbian operating system and was developing a browser based on WebKit for mobile phones running S60. Named Web Browser for S60, it was used on Nokia, Samsung, LG, and other Symbian S60 mobile phones. Apple has also ported WebKit to iOS to run on the iPhone, iPod Touch, and iPad, where it is used to render content in the device's web browser and e-mail software. The Android mobile phone platform used WebKit (and later versions its Blink fork) as the basis of its web browser and the Palm Pre, announced January 2009, has an interface based on WebKit. The Amazon Kindle 3 includes an experimental WebKit based browser.
In June 2007, Apple announced that WebKit had been ported to Microsoft Windows as part of Safari.
WebKit has also been ported to several toolkits that support multiple platforms, such as the GTK toolkit for Linux which is using by GNOME Web, Adobe Integrated Runtime, Enlightenment Foundation Libraries (EFL), and the Clutter toolkit. Qt Software included a WebKit port in the Qt 4.4 release as a module called QtWebKit (since superseded by QtWebEngine, which uses Blink instead). The Iris Browser on Qt also used WebKit. The Enlightenment Foundation Libraries (EFL) port – EWebKit – was developed (by Samsung and ProFusion) focusing the embedded and mobile systems, for use as stand alone browser, widgets-gadgets, rich text viewer and composer. The Clutter port is developed by Collabora and sponsored by Robert Bosch GmbH.
There was also a project synchronized with WebKit (sponsored by Pleyo) called Origyn Web Browser, which provided a meta-port to an abstract platform with the aim of making porting to embedded or lightweight systems quicker and easier. This port is used for embedded devices such as set-top boxes, PMP and it has been ported into AmigaOS, AROS and MorphOS. MorphOS version 1.7 is the first version of Origyn Web Browser (OWB) supporting HTML5 media tags.
Forking by Google
An optimizing just-in-time (JIT) compiler named FTL was announced on May 13, 2014. It uses LLVM to generate optimized machine code. "FTL" stands for "Fourth-Tier-LLVM", and unofficially for faster-than-light, alluding to its speed. As of February 15 2016, the backend of FTL JIT is replaced by "Bare Bones Backend" (or B3 for short).
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