W3C home > Mailing lists > Public > www-validator@w3.org > July 2004

Re: Icon

From: Olivier Thereaux <ot@w3.org>
Date: Thu, 8 Jul 2004 07:15:01 +0900
To: steve@wordpool.co.uk
Cc: www-validator@w3.org
Message-ID: <20040707221501.GC1927@w3.mag.keio.ac.jp>

On Wed, Jun 30, 2004, Steve Kimpton wrote:
> You'll notice that the file is just ...valid-html401

It's important to understand that it is not the *file* we are talking
about here, but the URI referencing a resource on the web. Not only is
that very remote, conceptually, from a file, but this difference between
information space and a file system also has important practical
implications (see below).

> valid-html401.gif or valid-html401.png although I now see that both of these
> are in your Icons directory.  

Precisely. The fact that the link points to foo and that the server
holds foo.gif and foo.png is not a mistake, but a way to serve
different variants (in format) of the same resource (the valid HTML 4.01
icon) depending on what the browser claims to prefer. 

Search "http format negotiation" or "http content negotiation" in your
favorite Web search engine for more details on this.

> I'm guessing this is the reason for his problem. 
I doubt it, but this is not impossible, if this person's browsers claim
to support a type of image it does not actually support. But then it's
the browser that is broken, and there is little we can do.

Hope this answers your questions.

Received on Wednesday, 7 July 2004 18:15:03 UTC

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