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Re: XHTML validator problems

From: Beton, Richard <richard.beton@roke.co.uk>
Date: Thu, 22 Jan 2004 10:10:29 +0000
To: www-validator@w3.org
Message-ID: <400FA195.50104@roke.co.uk>

Allan Smith wrote:

>The page at
>validates as XHTML1.0 Transitional using the online validator at
>But when I change the DTD to Strict it fails
>Also if I change the DTD to XHTML 1.1 it fails 
>align="right" not valid in IMG (line 50)
>But there is no objection to 
>Align="left" in IMG (line58)
>I'm obviously missing a trick here - help please?

Hi Allan,

I looked at http://www.telfordsteamrailway.co.uk/testcss.html (ie not 
with .shtml) and found no validator problems. So it looks like both the 
XHTML1.1 and CSS are fine.  I tried it via upload too, and that worked 
without a hitch.  I couldn't see an img element on line 58.

I might offer three rather minor observations.  Your link 'surrounding 
site' contains a space in the href attribute value; conveniently, my 
browser seems to drop this space when I click the link, so it seems not 
to matter.

Secondly, your content-type setting is unusual and (unless I am 
mistaken) non standard. You specified

<meta http-equiv="Content-Type" content=" en-gb; text/html; 
charset=iso-8859-1" />

but the language part (" en-gb;") does not belong here.  RFC2616 
specifies the formal syntax for the content type as

    Content-Type = "Content-Type" ":" media-type
    media-type = type "/" subtype *( ";" parameter )

which means examples like "text/html" and "application/xhtml+xml; 
charset=iso-8859-1" would both be valid, whereas putting anything before 
the 'type' part is not valid.  The asterisk in the formal grammer means 
that any number of parameters can optionally be /appended/ (but not 
prepended), separated by semicolons.  But to specify a content language 
in the HTTP header, you'd have to do it a different way and put this in 
the XHTML:

<meta http-equiv="Content-Language" content="en-gb" />

This seems pointless because it duplicates the function of the XHTML 
<html xml:lang="en-gb"> attribute.

It's no surprise that the W3C Validator (an HTML validator) does not 
validate the HTTP parameters, which are probably considered outside its 

The other observation is more a question really.  When a document such 
as this one is XML and so starts with (in this case)

<?xml version="1.0" encoding="iso-8859-1"?>

does this mean that the <meta> giving the content type and encoding is 

<meta http-equiv="Content-Type" content=" en-gb; text/html; 
charset=iso-8859-1" />

What would happen if the <meta> gave a different character encoding from 
the <?xml?> line?

Rick :-)

HTTP1.1 - RFC2616: http://www.ietf.org/rfc/rfc2616.txt
Language tags - RFC1766: http://www.ietf.org/rfc/rfc1766.txt

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Received on Thursday, 22 January 2004 05:12:43 UTC

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