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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.
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 W3C developed a comprehensive test suite to achieve broad interoperability for the full specification by 2014, which was the target date for recommendation. [26] In January 2011, the WHATWG renamed its "HTML5" specification HTML Living Standard. The W3C nevertheless continued its project to release HTML5. [27]
Schema.org is an initiative launched on June 2, 2011, by Bing, Google and Yahoo! [3] [4] [5] (operators of the world's largest search engines at that time) [6] to create and support a common set of schemas for structured data markup on web pages.
In 2007, the W3C's HTML working group voted to officially recognize HTML5 and work on it as the next-generation HTML standard. [8] In 2009, the W3C allowed the XHTML 2.0 Working Group's charter to expire, acknowledging that HTML5 would be the sole next-generation HTML standard, including both XML and non-XML serializations. [9]
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 CSS specifications are maintained by the World Wide Web Consortium (W3C). Internet media type text/css is registered for use with CSS by RFC 2318 (March 1998). The W3C operates a free CSS validation service for CSS documents. [6] In addition to HTML, other markup languages support the use of CSS including XHTML, plain XML, SVG, and XUL.