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Most pages on the World Wide Web are written in computer languages (such as HTML) that allow Web authors to structure text, add multimedia content, and specify what appearance, or style, the result should have.

As for every language, these have their own grammar, vocabulary and syntax, and every document written with these computer languages are supposed to follow these rules. The (X)HTML languages, for all versions up to XHTML 1.1, are using machine-readable grammars called DTDs, a mechanism inherited from SGML.

However, Just as texts in a natural language can include spelling or grammar errors, documents using Markup languages may (for various reasons) not be following these rules. The process of verifying whether a document actually follows the rules for the language(s) it uses is called validation, and the tool used for that is a validator. A document that passes this process with success is called valid.

from Wikipedia
Intellectual freedom encompasses the freedom to hold, receive and disseminate ideas without restriction. Viewed as an integral component of a democratic society, intellectual freedom protects an individual's right to access, explore, consider, and express ideas and information as the basis for a self-governing, well-informed citizenry. Intellectual freedom comprises the bedrock for freedoms of expression, speech, and the press and relates to freedoms of information and privacy.