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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.
W3C offers online services to test websites directly for both web site developers, as well as for website users. These include: Markup Validation Service to check the markup (HTML, XHTML, ...) of Web documents; CSS Validation Service to check Cascading Style Sheets (CSS) and (X)HTML documents with style sheets
XHTML+RDFa documents can be validated individually online at the W3C Markup Validation Service or together with CSS and RSS at W3C Unicorn. The validity of XHTML+RDFa documents can be indicated by the XHTML+RDFa conformance icons of W3C.
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. [5] 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 ...
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. CSS is also used in the GTK widget toolkit.
Cascading Style Sheets (CSS) provide a mechanism to specify the presentation of elements in a document without altering the markup structure of the document. Before CSS was commonplace, web developers may have resorted to some structurally invalid markup to achieve certain presentational goals – for example, including block level elements ...
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 ...