Diagnostic.css : Diagnostic.css is a stylesheet which allows the user to test for common errors in a page's markup.
Also : https://github.com/karlgroves/diagnostic.css
Foundation : An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.
Photon : UI toolkit for building desktop apps with Electron.
* { CSS:resetr } : To help you find the perfect CSS-reset styles, CSSresetr lets you try all the best CSS Resets on a variety of web pages – even your own.
