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Re: Fw: Error Message Feedback (custom DTD document)

From: David Dorward <david@dorward.me.uk>
Date: Tue, 4 Jul 2006 16:49:07 +0100
To: Charles Robertson <cdesign@btinternet.com>
Cc: www-validator@w3.org
Message-ID: <20060704154907.GB20856@us-lot.org>

On Tue, Jul 04, 2006 at 03:58:17PM +0100, Charles Robertson wrote:
>    Then what is the point of using a custom DTD?

For internal data formats, and for SGML/XML applications which don't
try to extend HTML but serve entirely different purposes (such as

>    I am sure the <IMG> ALIGN="" attribute has the following possible values:

(I think you mean valign there)

There are various vendor extensions and experimental implementations
supported to various degrees by different browsers.

The CSS vertical-align property gives more options.

>    And why is the <LAYER> tag not supported by any of the DOCTYPES?

Since it was a proprietary extension only ever supported by Netscape
4.x (which is no longer supported by the vendor) which doesn't do
anything that can't be achieved with elements that exist in HTML 4.x
and style sheets.

David Dorward                                      http://dorward.me.uk
Received on Tuesday, 4 July 2006 15:49:28 UTC

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