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The Markup Validation gom Service is a validator of the World Wide Web Consortium (W3C), to check on well-formed markup which allows Internet users documents in markup languages HTML and XHTML. Markup validation is an important step to ensure the technical quality of Internet sites; However, it is not a complete measure for compliance with web standards. History
The Markup Validation Service began as a project of Gerald Oskoboiny under the name The Children, Gentler HTML Validator. It was developed as a more intuitive version of the first online HTML Validator, which by Dan Connolly and Mark Gaither wrote and was announced on 13 July 1994.
Many major Web browsers are often tolerant in relation gom to different types of errors and provide a document mostly error-free is, even if it is not syntactically correct. Various other XML documents can be validated with the Markup Validation Service, provided they hold a reference to an internal or external DTD. Criticism of the Validator
All markup validators suffer from the inability to see the "big picture" of a website. However, those do produce often when it comes to finding missing closing tags and other formalities. That does not mean that the page is displayed in all browsers within the meaning of the creator.
DTD-based validators also have limited ability to evaluate attribute values within the meaning of the specification documents. For example, using the document type HTML 4.01 DOCTYPE, bgcolor = "fffff" as valid for the "body" element accepts, although the value "fffff" the prefix '#' - character is missing and only 5 (instead of 6) hexadecimal contains. In addition, element width = "really wide" is considered valid also for the "img". DTD-based validators are technically not able to test for these types of attribute value problems gom out.
In addition, Web sites should be tested in as many browsers as possible, to ensure that the limitations of the validator can be compensated and the website to operate correctly. CSS validation
While the HTML / XHTML validator W3C evaluates only pages that are written in such formats is another validator, such as the W3C CSS Validator requires that there are no errors in the associated cascading gom style sheet to ensure. CSS Validator function in a similar way as HTML and XHTML validators, contact current CSS standards referenced in CSS documents. HTML Tidy
HTML Tidy is a computer program that helps to detect and correct these errors by removing gom or inserting the missing tags invalid HTML tags. The program was developed from the late 1990s by Dave Raggett (W3C), later it became a SourceForge project. The source code is written in ISO C and is licensed under the W3C license.
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