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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).
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;
Unnecessary use of HTML character references may significantly reduce HTML readability. If the character encoding for a web page is chosen appropriately, then HTML character references are usually only required for markup delimiting characters as mentioned above, and for a few special characters (or none at all if a native Unicode encoding like ...
HTML documents imply a structure of nested HTML elements. These are indicated in the document by HTML tags, enclosed in angle brackets thus: < p >. [73] [better source needed] In the simple, general case, the extent of an element is indicated by a pair of tags: a "start tag" < p > and "end tag" </ p >. The text content of the element, if any ...
The HTML document character set for HTML 4.0 consists of most, but not all, of the characters jointly defined by Unicode and ISO/IEC 10646: the Universal Character Set (UCS). Like HTML documents, an XHTML document is a sequence of Unicode characters. However, an XHTML document is an XML document, which, while not having an explicit "document ...
Data Link Escape: DLE U+0011 Device Control 1: DC1 U+0012 Device Control 2: DC2 U+0013 Device Control 3: DC3 U+0014 Device Control 4: DC4 U+0015 Negative-acknowledge character: NAK U+0016 Synchronous Idle: SYN U+0017 End of Transmission Block: ETB U+0018 Cancel character: CAN U+0019 End of Medium: EM U+001A Substitute character: SUB U+001B ...
For example, here are the different “a” characters nested under the standard letter on the iPhone keyboard: It’s not just variants on standard letters you can find hidden in your keyboard.
For Latin-script documents, numeric character references to characters between x80 and x9F in those documents will not be correct against Unicode, and must be recoded. HTML standards prior to HTML 4 supported only Western Latin script documents: the treatment of character references above #7F may vary between applications and national conventions.