HTML decimal character rendering: Difference between revisions

Revision as of 13:37, 31 August 2005

Revision as of 17:53, 19 October 2005

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===Illegal characters===

HTML forbids the use of the characters with [[Universal Character Set]]/[[Unicode]] code points

* 0000–0008

* 0011

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* 0128–0159

These characters are ''not even allowed by reference''. That is, you are not even allowed to write them as [[numeric character referencesreference]]s. However, references to characters 0128&ndash;0159 are commonly interpreted by lenient web browsers as if they were references to the characters assigned to ''bytes'' 128&ndash;159 (decimal) in the [[ISO 8859-1|Windows-1252]] character encoding. This is in violation of HTML and SGML standards, and the characters are already assigned to higher code points, so HTML document authors should always use the higher code points. For example, for the trademark sign (&#8482;), use <code>&amp;#8482;</code>, not <code>&amp;#153;</code>.

The characters 0009 (tab), 0010 (linefeed), 0012 (form feed), and 0013 (carriage return) are allowed in HTML documents, but, along with 0032 (space) are all considered "white space", and, except in a <code>&lt;pre&gt;</code> block, are interpreted as comprising a single "word separator" for rendering purposes. A word separator is typically rendered a single en-width space in European languages, but not in others.