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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.
This XHTML generates the output below when rendered in a web browser. Rendered XHTML generated from an XML input file and an XSLT transformation. In order for a web browser to be able to apply an XSL transformation to an XML document on display, an XML stylesheet processing instruction can be inserted into XML.
The RDFa markup in XHTML+RDFa reuses the markup code, thus eliminating the need for unnecessary duplications. XHTML+RDFa is not widely distributed yet, probably due to the lack of support in authoring tools and content management systems. [9] However, there is good tendency. Drupal 7, for example, supports RDFa. [10]
RDFa was defined in 2008 with the "RDFa in XHTML: Syntax and Processing" Recommendation. [16] Its first application was to be a module of XHTML.. The HTML applications remained, "a collection of attributes and processing rules for extending XHTML to support RDF" expanded to HTML5, are now expressed in a specialized standard, the "HTML+RDFa" (the last is "HTML+RDFa 1.1 - Support for RDFa in ...
XHTML Basic is suitable for mobile phones, PDAs, pagers, and settop boxes. XHTML Basic was once intended to replace older technologies like WML and C-HTML as more compliant user agents were developed. However, with the rise of HTML5 as the dominant web standard, XHTML Basic has been largely supplanted. HTML5's rich feature set and cross-device ...
Flying Saucer (also called XHTML renderer) is a pure Java library for rendering XML, XHTML, and CSS 2.1 content. It is intended for embedding web-based user interfaces into Java applications, but cannot be used as a general purpose web browser since it does not support HTML .
HTML5 does not require one, but it is often added for compatibility with XHTML and XML processing. In a well-formed document, all elements are well-formed, and; a single element, known as the root element, contains all of the other elements in the document. For example, the code below is not well-formed HTML, because the em and strong elements ...