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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.
By contrast, XHTML requires all elements to have an opening tag and a closing tag. XHTML, however, also introduces a new shortcut: an XHTML tag may be opened and closed within the same tag, by including a slash before the end of the tag like this: < br />. The introduction of this shorthand, which is not used in the SGML declaration for HTML 4. ...
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.
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.
In cases where the content attribute's value is a URL, many authors decide to use a link element with a proper value for its rel attribute as well. [ 27 ] For a comparison on when it is best to use HTTP-headers, meta-elements, or attributes in the case of language specification: see here .
Where element names the HTML element type, and attribute is the name of the attribute, set to the provided value.The value may be enclosed in single or double quotes, although values consisting of certain characters can be left unquoted in HTML (but not XHTML).
Hundreds of document formats using XML syntax have been developed, [12] including RSS, Atom, Office Open XML, OpenDocument, SVG, COLLADA, and XHTML. XML also provides the base language for communication protocols such as SOAP and XMPP .
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 ...