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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.
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.
Schema.org is a reference website that publishes documentation and guidelines for using structured data mark-up on web-pages (called microdata).Its main objective is to standardize HTML tags to be used by webmasters for creating rich results (displayed as visual data or infographic tables on search engine results) about a certain topic of interest. [2]
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 updated unlike web-based solutions which are typically kept updated by the solution provider.
Data download allows webmasters to access the first 1000 results in a CSV file to analyze the results. Keyword search tool allows webmasters to explore new keywords. Robots.txt validator allows webmasters to check if their robots.txt file meets the standard. Markup validator allows webmasters to check if their site meets W3C standards.
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]