"The Web is built on HTML, CSS, and JavaScript, so SproutCore is in JavaScript and it leverages the built-in classes of JavaScript.

Built on top of GitHub’s Electron framework for cross-platform desktop apps, Quark is a general purpose tool that leverages JavaScript, CSS, and HTML.

Business apps built with web technologies, particularly HTML, CSS, and JavaScript, are in great demand since they can run natively on any mobile device.