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XHTML 1.0 Strict is the XML equivalent to strict HTML 4.01, and includes elements and attributes that have not been marked deprecated in the HTML 4.01 specification. As of November 2015 [update] , XHTML 1.0 Strict is the document type used for the homepage of the website of the World Wide Web Consortium .
One of the most noticeable differences between HTML and XHTML is the rule that all tags must be closed: empty HTML tags such as <br> must either be closed with a regular end-tag, or replaced by a special form: <br /> (the space before the '/' on the end tag is optional, but frequently used because it enables some pre-XML Web browsers, and SGML ...
Presentational markup [4] Open format; AsciiDoc: Multi-purpose Tag Yes Yes Yes Computable Document Format: Interactive technical documents, infographics, blogs [5] Wolfram Language: Tag Yes Yes No Darwin Information Typing Architecture (DITA) Technical documents XML: Tag Yes Yes [6] Yes DocBook: Technical documents SGML / XML: Tag Yes Yes [7] Yes
Later, HTML was reformulated (version 2.0) to be more of an SGML application; however, the HTML markup language has many legacy- and exception-handling features that differ from SGML's requirements. HTML 4 is an SGML application that fully conforms to ISO 8879 – SGML. [14]
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.
In HTML and SGML, a parser needed to know certain rules about elements during parsing, such as what elements could be contained within other elements and which elements implicitly close the previous element. This is because in HTML and SGML, closing tags and even opening tags were optional on some elements.
Extensible HyperText Markup Language (XHTML): HTML reformulated in XML syntax. XHTML Basic – a subset of XHTML for simple (typically mobile, handheld) devices. It is meant to replace WML, and C-HTML. XHTML Mobile Profile (XHTML MP) – a standard designed for mobile phones and other resource-constrained devices.
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. It offers the same three variations as HTML 4.0 and its last errata [23] were published on May 12, 2001 ...