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Fw: Web site accessibility-layers

From: David Poehlman <poehlman1@comcast.net>
Date: Tue, 15 Apr 2003 14:21:45 -0400
To: wai-ig list <w3c-wai-ig@w3.org>
Message-id: <00e801c3037b$df9376f0$6501a8c0@handsontech>

----- Original Message ----- 
From: "Karen Guo" <ig2547@YAHOO.COM>
Sent: Tuesday, April 15, 2003 3:21 PM
Subject: Web site accessibility-layers

I still have some questions about layer's accessibility. How to turn
layers off? What's the difference between content's logical order and
visual order? Is there any reference or good website using layers that I
can take a look at? Thanks.

karen guo

On Fri, 4 Apr 2003 09:09:56 -0500, Denis Anson <danson@MISERICORDIA.EDU>

>"Layers" is a feature of HTML and CSS that allows content that is
>arranged logically in a document to be displayed visually in another
>layout.  There are layer codes (z-index) that determine which layer is
>on top, and which is under.  By setting the z-index, presentation order
>can be changed.
>In the background, layers are created using the <div></div E markup,
>which will be ignored by many types of assistive technologies.  This is
>what allows accessible pages to be created with layers - they can be
>invisible to those who need access.
>However, because the visual presentation is not necessarily the same as
>the logical presentation, it is critical that a page designed with
>layers be constructed so that, with the layers turned off, the page
>makes sense.  This is where many designers can mess things up.  The
>page should be designed first so that the content is in logical order,
>then the layers used to provide the desired visual presentation, with
>the awareness that not everyone will see the "visual" order.
>Denis Anson
Received on Tuesday, 15 April 2003 14:31:25 UTC

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