OptionalhtmlHTML lang attribute from tag
OptionalcontentContent-Language meta tag
OptionalogOpenGraph locale
OptionalalternateOpenGraph alternate locales
OptionalprimaryPrimary language (best guess, normalized to ISO 639-1)
OptionalregionRegion code (if available, ISO 3166-1 alpha-2)
Language and localization metadata.
Remarks
Contains language and locale information from various sources including HTML lang attribute, meta tags, and OpenGraph locale.