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[Bug 10661] use an ISO 639-2 specified language for HTML5 documents

From: <bugzilla@jessica.w3.org>
Date: Tue, 21 Sep 2010 16:44:40 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1Oy5xQ-0004Pc-Ul@jessica.w3.org>

Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no> changed:

           What    |Removed                     |Added
                 CC|                            |xn--mlform-iua@xn--mlform-i
                   |                            |ua.no

--- Comment #5 from Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>  2010-09-21 16:44:40 ---
(In reply to comment #4)

> (FWIW, I think using private use language subtags in public is questionable,
> but if software fails to ignore unrecognized subtags and fails to pay attention
> to the standard subtags (en and US), that's a bigger problem that needs to go
> in the appropriate bug databases.)

Where is it defined that user agents must ignore the 'x-*' part? I don't think
that anyone can infer what 'en-us-x-hixie' means. There is no semantic
difference between 'en-us-x-hixie' and 'en-us-x-myscript' or
'en-us-x-my-invented-orthogra-phy'. It would perhaps be smart of user agents to
- by default - ignore the '-x-whatever' part. But I don't think it is said
anywhere that they should.

> Is this a practical problem? That is, are there screen readers in use that
> don't properly ignore language subtags they don't know about. If there are,
> have you filed bugs against those screen readers about implementing RFC 5646
> properly?

First one needs to know what the proper treatment of such tags is. From BCP47:

2.2.  Language Subtag Sources and Interpretation


o  The single-letter subtag 'x' introduces a sequence of private use
      subtags.  The interpretation of any private use subtag is defined
      solely by private agreement and is not defined by the rules in
      this section or in any standard or registry defined in this

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Received on Tuesday, 21 September 2010 16:44:43 UTC

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