For example, Konqueror has native MNG/JNG support, and MNG/JNG plugins are available for Opera, Internet Explorer, and Mozilla Firefox.
FormFaces is compatible with browsers that implement XHTML 1.0, ECMAScript-262 3rd Edition, and DOM Level 2 which includes Internet Explorer, Mozilla, Firefox, Opera, Konqueror, Safari, and NetFront.
KDE's open-source KHTML engine is used in KDE's Konqueror web browser and was the basis for WebKit, the rendering engine in Apple's Safari and Google's Chrome web browsers, which is now the most widely used browser engine according to StatCounter.