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  2. HTML - Wikipedia

    en.wikipedia.org/wiki/HTML

    HTML 4 is an SGML application conforming to ISO 8879 – SGML. [20] April 24, 1998 HTML 4.0 [21] was reissued with minor edits without incrementing the version number. December 24, 1999 HTML 4.01 [22] was published as a W3C Recommendation.

  3. Document type declaration - Wikipedia

    en.wikipedia.org/wiki/Document_type_declaration

    <!DOCTYPE html>, case-insensitively. With the exception of the lack of a URI or the FPI string (the FPI string is treated case sensitively by validators), this format (a case-insensitive match of the string !DOCTYPE HTML) is the same as found in the syntax of the SGML based HTML 4.01 DOCTYPE. Both in HTML4 and in HTML5, the formal syntax is ...

  4. XHTML - Wikipedia

    en.wikipedia.org/wiki/XHTML

    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.

  5. HTML5 - Wikipedia

    en.wikipedia.org/wiki/HTML5

    The Web Hypertext Application Technology Working Group (WHATWG) began work on the new standard in 2004. At that time, HTML 4.01 had not been updated since 2000, [10] and the World Wide Web Consortium (W3C) was focusing future developments on XHTML 2.0.

  6. Meta element - Wikipedia

    en.wikipedia.org/wiki/Meta_element

    The meta element has two uses: either to emulate the use of an HTTP response header field, or to embed additional metadata within the HTML document. With HTML up to and including HTML 4.01 and XHTML, there were four valid attributes: content, http-equiv, name and scheme. Under HTML 5, charset has been added and scheme has been removed.

  7. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    It was developed to be a more intuitive version of the first online HTML validator written by Dan Connolly and Mark Gaither, which was announced on July 13, 1994. [ 3 ] In September 1997, Oskoboiny began working for the W3C, and on December 18, 1997, the W3C announced its W3C HTML Validator based upon his works. [ 4 ]

  8. alt attribute - Wikipedia

    en.wikipedia.org/wiki/Alt_attribute

    The attribute was first introduced in the HTML 1.2 draft in 1993 to provide support for text-based browsers. [1] In HTML 4.01, which was released in 1999, the attribute was made to be a requirement for the img and area tags. [2] It is optional for the input tag and the deprecated applet tag. [3]

  9. Wikipedia:HTML5 - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:HTML5

    Following common practice (e.g. the use of <cite> around links to author IDs in blog and forum software, and many other well-deployed uses for the element for more than work titles), Wikipedia is following the W3C HTML5.2 Recommendation, which has superseded HTML 4.01, XHTML 1.1, and all other previous W3C [X]HTML specs.