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Proposed Technique for 2.1.2

From: Charles McCathieNevile <charles@w3.org>
Date: Mon, 5 Apr 1999 15:48:07 -0400 (EDT)
To: WAI AU Guidelines <w3c-wai-au@w3.org>
Message-ID: <Pine.LNX.4.10.9904051544530.26497-100000@tux.w3.org>
For 2.1.2 - Ensure extended DTDs are accessible

New document types are constantly being developed, and in many cases offer
improvements to the structure and utility of web content. In implementing
a new or extended document type it is important to ensure that a tool is
not removing access to information which had been inherent in the base
document type.

An example of a document type which contravenes this checkpoint is a
FRAMESET (link to w3c frameset.dtd) used without NOFRAMES - it precludes
access to the underlying information, whereas NOFRAMES provides a means to
access the information contained within the FRAMESET.

The same can apply to a reduced DTD. For example, producing a DTD which
did not include the ALT attribute for IMG, or effectively working to such
a DTD by not implementing a means to include the attribute compromises the
accessibility of any included IMG elements.

Charles McCathieNevile
Received on Monday, 5 April 1999 15:48:09 UTC

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