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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 …

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

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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.

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With W3Schools online code editor, you can edit HTML, CSS and JavaScript code, and view the result in your browser. The window to the left is editable - edit the code and click on the "Run" button to …

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