Language References

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Specifies the language of the linked document.

Inline	<element hreflang = sLanguage...>
Script	object.hreflang = sLanguage ]

sLanguage

String specifying a valid BCP 47 language tag.

The property is read/write with no default value.

The hreflang attribute, if present, gives the language of the linked resource.

This attribute may only be used when the href attribute is specified.

It is purely advisory. User agents must not consider this attribute authoritative.

The value must be a valid BCP 47 language tag.

Upon fetching the resource, user agents must use only language information associated with the resource to determine its language, not metadata included in the link to the resource.

A, AREA, LINK

How HyperText Links Work