ĭuring 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. 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. Thus, these patches were difficult for the KDE developers to integrate back into KHTML. They claimed Apple submitted their changes in large patches containing multiple changes with inadequate documentation, often in relation to future additions to the codebase. 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". 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. Īccording to Apple, some changes which called for different development tactics involved macOS-specific features that are absent in KDE's KHTML, such as Objective-C, KWQ (pronounced "quack") an implementation of the subset of Qt required to make KHTML work on macOS written in Objective C++, and macOS calls. JavaScriptCore was announced in an e-mail to a KDE mailing list in June 2002, alongside the first release of Apple's changes. KHTML and KJS was ported to macOS with the help of an adapter library and renamed WebCore and JavaScriptCore. Melton explained in an e-mail to KDE developers that KHTML and KJS allowed easier development than other available technologies by virtue of being small (fewer than 140,000 lines of code), cleanly designed and standards-compliant. The WebKit project was started within Apple by Lisa Melton on June 25, 2001, as a fork of KHTML and KJS. The code that would become WebKit began in 1998 as the KDE HTML ( KHTML) layout engine and KDE JavaScript ( KJS) engine. As of March 7, 2013, WebKit is a trademark of Apple, registered with the U.S. WebKit is open source and available under the BSD 2-Clause license with the exception of the WebCore and JavaScriptCore components, which are available under the GNU Lesser General Public License. On April 3, 2013, Google announced that it had forked WebCore, a component of WebKit, to be used in future versions of Google Chrome and the Opera web browser, under the name Blink. WebKit supports macOS, Windows, Linux, and various other Unix-like operating systems. WebKit started as a fork of the KHTML and KJS libraries from KDE, and has since been further developed by KDE contributors, Apple, Google, Nokia, Bitstream, BlackBerry, Sony, Igalia, and others. 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. WebKit is also used by the PlayStation consoles beginning from the PS3, the Tizen mobile operating systems, the Amazon Kindle e-book reader, Nintendo consoles beginning from the 3DS Internet Browser, and the discontinued BlackBerry Browser. WebKit is a browser engine developed by Apple and primarily used in its Safari web browser, as well as all web browsers on iOS and iPadOS. LGPLv2.1 (rendering engine, JavaScript engine), BSD 2-Clause (additional contributions from Apple)
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