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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.
Such validators as the deprecated [19] Google Structured Data Testing Tool, or more recent [20] Google Rich Results Test Tool, [21] Schema.org Markup Validator, [22] Yandex Microformat validator, [23] and Bing Markup Validator [24] can be used to test the validity of the data marked up with the schemas and
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.
The World Wide Web Consortium (W3C) was founded in 1994 by Tim Berners-Lee after he left the European Organization for Nuclear Research in October 1994. [4] It was founded at the Massachusetts Institute of Technology (MIT) Laboratory for Computer Science with support from the European Commission, and the Defense Advanced Research Projects Agency, which had pioneered the ARPANET, the most ...
Version 17 added support for the Accelerated Mobile Pages Project, which is a type of HTML optimized for mobile web browsing, and support for live DOM validation using Google Chrome [3] CSS HTML Validator 2018/v18 renames the software from CSE HTML Validator to CSS HTML Validator and includes updated HTML5 and CSS support.
The WHATWG was formed in response to the slow development of World Wide Web Consortium (W3C) Web standards and W3C's decision to abandon HTML in favor of XML-based technologies. [7] The WHATWG mailing list was announced on 4 June 2004, [ 8 ] two days after the initiatives of a joint Opera–Mozilla position paper [ 9 ] had been voted down by ...
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