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
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.
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.
From the spec:
A language tag is composed from a sequence of one or more "subtags", each of which refines or narrows the range of language identified by the overall tag. Subtags, in turn, are a sequence of alphanumeric characters (letters and digits), distinguished and separated from other subtags in a tag by a hyphen ("-", [Unicode] U+002D)
So en-US is correct..
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