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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 Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs. It is helpful for catching minor problems such as duplicate section names or citation IDs.
CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Windows (and Linux when used with Wine) that helps web developers create syntactically correct and accessible HTML/HTML5, XHTML, and CSS documents by locating errors, potential problems like browser compatibility issues, and common mistakes.
The W3C Markup Validation Service, including Nu Html Checker; HTML 5.2, the last HTML recommendation from W3C, superseded; Memorandum of Understanding Between W3C and WHATWG; HTML Media Extensions Working Group; HTML.next, Feature requests for future versions of HTML
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.
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.
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
On 28 May 2019, the W3C announced that WHATWG would be the sole publisher of the HTML and DOM standards. [25] [26] [16] [27] The W3C and WHATWG had been publishing competing standards since 2012. While the W3C standard was identical to the WHATWG in 2007 the standards have since progressively diverged due to different design decisions. [28]