[whatwg] [WA1] lang and xml:lang
Lachlan Hunt
lachlan.hunt at lachy.id.au
Sun Apr 17 05:00:54 PDT 2005
Ian Hickson wrote:
> On Sun, 17 Apr 2005, Lachlan Hunt wrote:
>
>># If both the xml:lang attribute and the lang attribute are set, user
>># agents must use the xml:lang attribute, and the lang attribute must be
>># ignored for the purposes of determining the element's language.
>>
>>Is that the case for both HTML and XHTML documents?
>
> Yes.
So, if I have this HTML document
<!DOCTYPE ...>
<html lang="en" xml:lang="fr">
<title>HTML document</title>
<p>This is an HTML, not an XML, document.
Considering that legacy HTML UAs won't know about the xml:lang
attribute, and will only use lang, are you saying that a conforming Web
Apps UA should treat the document as french?
>>It would make more sense if, in the case of both being set, lang was
>>used for text/html documents and xml:lang for XML documents.
>
> The only way you can set xml:lang in an HTML document is via the DOM
Now I'm confused. If that's the case, then wouldn't the above example
be treated as english, regardless of the xml:lang attribute in the source?
> (in HTML, there are no namespaces).
Which is why xml:lang should be completely ignored, as an unknown
attribute, in HTML.
> I don't think it's worth having special requirements for something
> that no-one is likely to ever do outside of obscure test cases.
I've seen people use lots of XML syntax in HTML documents, including
xmlns and xml:lang attributes even in one that had an explicit HTML4
DOCTYPE (though I can't remember where) and not just in MS Word
generated rubbish. The point is authors do a lot of silly things, and I
thought UA behaviour needed to be well defined for as many use cases as
possible.
>>However, in the case of only one being set but for the wrong MIME type
>>(eg. xml:lang set for text/html document or lang for XML document), for
>>error recovery, should UAs be allowed to fallback on it?
>
> If xml:lang="" is set onin a text/html document, it'll be {html,
> 'xml:lang'}, not {xml, 'lang'} which is what xml:lang really is.
I don't understand how that answers the question.
--
Lachlan Hunt
http://lachy.id.au/
http://GetFirefox.com/ Rediscover the Web
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