Glossary Term
BCP 47 language tag
A BCP 47 language tag is a string of characters that precisely specifies a human language in terms of the basic language, but also optionally the writing system and dialect. For example, en specifies English, but en-GB and en-US more precisely specify British English and American English, respectively.
BCP 47 language tags are used anywhere on the web platform where a feature has been designed to output different results depending on the specified language, enabling internationalization support.
The HTML lang attribute The HTML <track> element The Temporal object The CanvasRenderingContext2D.lang property The Translator and Language Detector APIs
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