Which Language Attribute is Correct?

Question

I'm sure this has been asked a million times before, and I've googled it a few times, but I'm struggling here and need your help.

Which is correct for the HTML5 LANG attribute? en-US or en_US?

For example;

<html lang="en-US">

or

<html lang="en_US">

Your opinions would be greatly appreciated

Kit Sunde · Accepted Answer

The spec uses a dash - as a delimiter to specify language-extlang: http://www.w3.org/International/articles/language-tags/ so:

<html lang="en-US">

This is almost always the case when specifying langauge. The exceptions are frameworks like Django they may use an _ instead on the backend.

Aditya Korti · Answer

According to BCP 47 (RFC 5646 and RFC 4647) "en-US" seems to be correct.

It refers to the IANA Language Subtag and Language Tag Extensions registries.

I suggest you should refer to the best practices.

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