Webkit is an open source rendering engine. It was started by the KDE Software Community, and is now controlled by Apple. It is the most popular rendering engine in the world, used by Google ChromeSafari, Rekonq, Konqueror and many others.

Google confirmed it would be switching to its own fork of Webkit, Blink, but will maintain a Webkit version of Chrome. Most Mobile Websites are optimized for Webkit. 

WebKit's HTML and JavaScript code originally began as a fork of the KHTML and KJS libraries from KDE,[5] and has now been further developed by individuals from KDE, Apple, Google, Nokia, Bitstream, BlackBerry, Igalia, and others. OS X, Windows, GNU/Linux, and some other Unix-like operating systems are supported by the project.