About
The lang attribute can specified:
- in no namespace
- in the XML namespace
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Namespace
No
In no namespace, the language attribute specifies the primary language for the element's contents and for any of the element's attributes that contain text.
Its value must be:
- a valid BCP 47 language tag,
- or the empty string (unknown primary language)
The lang attribute is a global attributes.
Xml
The lang attribute is also defined in the XML namespace.
The lang attribute in the XML namespace xml:lang may be used:
- on HTML elements in XML documents,
- as well as elements in other namespaces if the relevant specifications allow it.
The following specifications allow lang attributes in the XML namespace to be specified on their elements).