What is the difference between <html lang="en"> and <html lang="en-US">? What other values can follow the dash?
According to w3.org "Any two-letter subcode is understood to be a [ISO3166] country code." so does that mean any value listed under the alpha-2 code is an accepted value?
This should help : http://www.w3.org/International/articles/language-tags/
The golden rule when creating language tags is to keep the tag as short as possible. Avoid region, script or other subtags except where they add useful distinguishing information. For instance, use ja for Japanese and not ja-JP, unless there is a particular reason that you need to say that this is Japanese as spoken in Japan, rather than elsewhere.
The list below shows the various types of subtag that are available. We will work our way through these and how they are used in the sections that follow.
language-extlang-script-region-variant-extension-privateuse
You can use any country code, yes, but that doesn't mean a browser or other software will recognize it or do anything differently because of it. For example, a screen reader might deal with "en-US" and "en-GB" the same if they only support an American accent in English. Another piece of software that has two distinct voices, though, could adjust according to the country code.
Well, the first question is easy. There are many ens (Englishes) but (mostly) only one US English. One would guess there are en-CN, en-GB, en-AU. Guess there might even be Austrian English but that's more yes you can than yes there is.
RFC 3066 gives the details of the allowed values (emphasis and links added):
All 2-letter subtags are interpreted as ISO 3166 alpha-2 country codes from [ISO 3166], or subsequently assigned by the ISO 3166 maintenance agency or governing standardization bodies, denoting the area to which this language variant relates.
I interpret that as meaning any valid (according to ISO 3166) 2-letter code is valid as a subtag. The RFC goes on to state:
Tags with second subtags of 3 to 8 letters may be registered with IANA, according to the rules in chapter 5 of this document.
By the way, that looks like a typo, since chapter 3 seems to relate to the the registration process, not chapter 5.
A quick search for the IANA registry reveals a very long list, of all the available language subtags. Here's one example from the list (which would be used as en-scouse):
Type: variant
Subtag: scouse
Description: Scouse
Added: 2006-09-18
Prefix: en
Comments: English Liverpudlian dialect known as 'Scouse'
There are all sorts of subtags available; a quick scroll has already revealed fr-1694acad (17th century French).
The usefulness of some of these (I would say the vast majority of these) tags, when it comes to documents designed for display in the browser, is limited. The W3C Internationalization specification simply states:
Browsers and other applications can use information about the language of content to deliver to users the most appropriate information, or to present information to users in the most appropriate way. The more content is tagged and tagged correctly, the more useful and pervasive such applications will become.
I'm struggling to find detailed information on how browsers behave when encountering different language tags, but they are most likely going to offer some benefit to those users who use a screen reader, which can use the tag to determine the language/dialect/accent in which to present the content.
XML Schema requires that the xml namespace be declared and imported before using xml:lang (and other xml namespace values) RELAX NG predeclares the xml namespace, as in XML, so no additional declaration is needed.
Source: Stackoverflow.com