KHTML is a HTML layout engine developed by the KDE project. It is the engine used by the Konqueror web browser. Descendants of KHTML are used by some of the world's most popular browsers, among them Google Chrome, Safari and Opera. Distributed under the terms of the GNU Lesser General Public License, KHTML is free software. Built on the KPart framework and written in C++, KHTML has relatively good support for Web standards. To render as many pages as possible, some extra abilities and quirks from Internet Explorer are also supported, even though those are non-standard.