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At W3Schools you will find complete references about HTML elements, attributes, events, color names, entities, character-sets, URL encoding, language codes, HTTP messages, browser support, and more:

W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. The reference contains examples for all properties, methods and events, and is continuously updated …

SQL References At W3Schools you will find a complete reference for keywords and functions:

PHP References W3Schools' PHP reference contains different categories of all PHP functions, keywords and constants, along with examples.

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CSS References At W3Schools you will find complete CSS references of all properties and selectors with syntax, examples, browser support, and more.

W3.CSS is a modern CSS framework developed by the W3Schools team. It's similar to Bootstrap when it comes to build responsive, mobile-friendly websites, but it is lighter, simpler, and faster, and does …

jQuery Examples Learn by examples! At W3Schools you will find a lot of jQuery examples to edit and test yourself. See All jQuery Examples