C4.js C4.js is a fast and small JavaScript library provides functions and framework to help front-end web development, using by KNSoft.org internally. Modules C4.js has following modules provide different features and functions: Native Extends Module Feature Polyfill Provides new functionality on old browsers that not support it NativeExt Extends methods on native classes and interfaces Basic Functions Module Feature AJAX Sends XMLHttpRequest Cookie Accesses cookies CSS Handles CSS and apply default CSS provided by C4.js Advanced Features Module Feature Load Loads HTML, JS, CSS, JSON and other resources by using AJAX API Web API framework of C4.js Modern Technology Providers Module Feature VDOM VDOM technology support SPA Single-Page-Application support