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This article lists the character entity references that are valid in HTML and XML documents. A character entity reference refers to the content of a named entity. An entity declaration is created in XML, SGML and HTML documents (before HTML5) by using the <!ENTITY name "value"> syntax in a document type definition (DTD).
A description list (a.k.a. association list or definition list) consists of name–value groups, [21] and was known as a definition list prior to HTML5. [22] Description lists are intended for groups of "terms and definitions, metadata topics and values, questions and answers, or any other groups of name–value data". [23]
A numeric character reference (NCR) is a common markup construct used in SGML and SGML-derived markup languages such as HTML and XML. It consists of a short sequence of characters that, in turn, represents a single character. Since WebSgml, XML and HTML 4, the code points of the Universal Character Set (UCS) of Unicode are used.
Here, linebreaks still cannot occur inside the list item, even if they are inside <pre>, and the HTML comment trick does not work inside <pre>, which is why this technique is only suitable for short code examples. For longer ones, see the <syntaxhighlight> MediaWiki tag. The HTML comment trick does work between elements inside the same list item:
in HTML, the value of the src attribute of the img element provides a URI reference, as does the value of the href attribute of the a or link element; in XML, the system identifier appearing after the SYSTEM keyword in a DTD is a fragmentless URI reference;
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Some HTML elements are defined as empty elements and take the form < tag attribute1 = "value1" attribute2 = "value2" >. Empty elements may enclose no content, for instance, the < br > tag or the inline < img > tag. The name of an HTML element is the name used in the tags. The end tag's name is preceded by a slash character /. If a tag has no ...
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