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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 DOM (Document Object Model), every element is a node: [4] A document is a document node. All HTML elements are element nodes. All HTML attributes are attribute nodes. Text inserted into HTML elements are text nodes. Comments are comment nodes.
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 ...
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.
An entity resolver may use either identifier for locating the referenced external entity. No internal subset has been indicated in this example or the next ones. The root element is declared to be html and, therefore, it is the first tag to be opened after the end of the doctype declaration in this example and the next ones, too. The HTML tag ...
An empty element may be: An empty HTML element, one with tag(s) but no content (HTML element § Empty element) An empty XML element, one with tag(s) but no content (XML § Key terminology) An empty SGML element, one with tag(s) but no content (Standard Generalized Markup Language § EMPTY).
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I'm puzzled as to why: passing them through would work (HTML5 is accepted as effectively universal), converting them to characters would work (it's Unicode clear throughout), but this behaviour gives an unexpected behaviour for editors, based on whether an entity if HTML5 or HTML 4. Note that this isn't a browser behaviour.