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The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
The W3C is the main international standards organization for the internet— they provide the W3C Markup Validation Service. Simply copy the full URL of the page to be validated and paste in into the validator. There is also a favelet that you can add to your browser bookmarks that will validate the current page.
A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the context of validating HTML, [1] [2] CSS, and XML documents like RSS feeds, though it can be used for any defined format or language.
A document can be checked for validity with the W3C Markup Validation Service (for XHTML5, the Validator. nu Living Validator should be used instead). In practice, many web development programs provide code validation based on the W3C standards.
Official website, World Wide Web Consortium (W3C) XML 1.0 Specification; Retrospective on Extended Reference Concrete Syntax Archived 2019-11-18 at the Wayback Machine by Rick Jelliffe; XML, Java and the Future of the Web (1997) by Jon Bosak; The Official (W3C) Markup Validation Service; The XML FAQ originally for the W3C's XML SIG by Peter Flynn
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
While some of the issues of tag soup are due to shortcomings of browsers and sometimes due to a lack of information for web authors, some of the proliferation of tag soup was due to missing links in the web standards themselves. The W3C has spearheaded several efforts to address the shortcomings of web standards.
HTML Tidy was developed by Dave Raggett [2] of the World Wide Web Consortium (W3C). Later it was released as a SourceForge project in 2003 and managed by various maintainers. [3] In 2012, the project was moved to GitHub, [4] and maintained by Michael Smith, also of W3C, [5] where HTML5 support was added.