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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.
The offline nature of CSS HTML Validator is in contrast to online web-based services. CSS HTML Validator primarily works offline (except for link checking when it must go online), which has speed and privacy benefits compared to web-based solutions and services like the W3C Markup Validation Service. However, the user must keep the software ...
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
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 ...
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.
RDFa in XHTML version 1.0 became a World Wide Web Consortium (W3C) Recommendation on 14 October 2008. [1] [2] The current recommendation is RDFa+XHTML version 1.1, which became a W3C Recommendation on 7 June 2012 [3] and was updated with a ”Second Edition” on 22 August 2013 [4] and a ”Third Edition” on 17 March 2015. [5]