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CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Microsoft Windows (and Linux and other Unix-like operating systems when used with Wine) that helps web developers create syntactically correct and accessible HTML/HTML5, XHTML, and CSS documents by locating errors, potential problems like browser compatibility issues, and common mistakes.
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.
XHTML 1.0 Transitional is the XML equivalent of HTML 4.01 Transitional, and includes the presentational elements (such as center, font and strike) excluded from the strict version. XHTML 1.0 Frameset is the XML equivalent of HTML 4.01 Frameset, and allows for the definition of frameset documents—a common Web feature in the late 1990s.
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 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.
External entities are not supported in basic profiles for SGML or in HTML documents, but are valid in full implementations of SGML and in XML 1.0 or 1.1 (including XHTML and SVG, even if they are not strictly needed in those document types). An example of internal entity declarations (here in an internal DTD subset of an SGML document) is:
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 ...
XPointer is a system for addressing components of XML-based Internet media. It is divided among four specifications: a "framework" that forms the basis for identifying XML fragments, a positional element addressing scheme, a scheme for namespaces, and a scheme for XPath-based addressing.