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RAWeb 1.1

Default language

Indication of the document's main processing language, which may be present on the html root element or on each element of the relevant page via the lang and/or xml:lang attributes, according to the following scheme:

  • For HTML up to version 4.01: lang attribute mandatory, xml:lang attribute not supported;
  • For XHTML 1.0 served as "text/html": lang and xml:lang attributes mandatory;
  • For XHTML 1.0 served as "application/xhtml+xml" xml:lang attribute mandatory, lang attribute recommended;
  • For XHTML 1.1: xml:lang attribute mandatory, lang attribute not supported;
  • For HTML5: lang attribute mandatory.

Where this term is used

2 accessibility criteria refer to this definition.