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  2. XHTML - Wikipedia

    en.wikipedia.org/wiki/XHTML

    The similarities between HTML 4.01 and XHTML 1.0 led many websites and content management systems to adopt the initial W3C XHTML 1.0 Recommendation. To aid authors in the transition, the W3C provided guidance on how to publish XHTML 1.0 documents in an HTML-compatible manner, and serve them to browsers that were not designed for XHTML. [28] [29]

  3. HTML5 - Wikipedia

    en.wikipedia.org/wiki/HTML5

    XHTML5 is simply XML-serialized HTML5 data (that is, HTML5 constrained to XHTML's strict requirements, e.g., not having any unclosed tags), sent with one of XML media types. HTML that has been written to conform to both the HTML and XHTML specifications and therefore produces the same DOM tree whether parsed as HTML or XML is known as polyglot ...

  4. HTML - Wikipedia

    en.wikipedia.org/wiki/HTML

    The W3C intended XHTML 1.0 to be identical to HTML 4.01 except where limitations of XML over the more complex SGML require workarounds. Because XHTML and HTML are closely related, they are sometimes documented in parallel. In such circumstances, some authors conflate the two names as (X)HTML or X(HTML). Like HTML 4.01, XHTML 1.0 has three sub ...

  5. XHTML Basic - Wikipedia

    en.wikipedia.org/wiki/XHTML_Basic

    While XHTML Basic remains functional, it is considered outdated in comparison to modern HTML5, which has become the dominant standard for mobile-first design. HTML5 includes features for multimedia, graphics, and responsive layouts, making it far more versatile for current web development needs.

  6. List of XML and HTML character entity references - Wikipedia

    en.wikipedia.org/wiki/List_of_XML_and_HTML...

    In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.

  7. Document type declaration - Wikipedia

    en.wikipedia.org/wiki/Document_type_declaration

    In XHTML5 the DOCTYPE must be a case-sensitive match of the string "<!DOCTYPE html>". This is because in XHTML syntax all HTML element names are required to be in lower case, including the root element referenced inside the HTML5 DOCTYPE. The DOCTYPE is optional in XHTML5 and may simply be omitted. [11]

  8. Tag soup - Wikipedia

    en.wikipedia.org/wiki/Tag_soup

    XHTML is a reformulation of the HTML language based on XML. XHTML was developed to address many of the problems associated with tag soup. XML allows parsers to separate the process of interpreting the document syntax and its structure.

  9. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    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.