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W3C's easy-to-use markup validation service, based on SGML and XML parsers.

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W-3 Transmittal of Wage and Tax Statements 2026 Send this entire page with the entire Copy A page of Form(s) W-2 to the Social Security Administration (SSA). Photocopies are not acceptable. Do not …

The World Wide Web Consortium (W3C) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.

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W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

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Why W3C web standards? W3C publishes recommendations, that are considered web standards. W3C develops technical specifications according to the W3C Process, which is designed to maximize …