----- Original Message -----
From: "Lauke PH" <[log in to unmask]>
To: "David Poehlman" <[log in to unmask]>; "wai-ig list"
<[log in to unmask]>
Sent: Wednesday, April 16, 2003 4:55 AM
Subject: RE: Web site accessibility-layers



> How to turn layers off?

Switch off CSS. this will then display the layers in the order they appear
in the source. If you mean "visually" switching layers on/off, that's either
a full CSS implementation (using some nifty :hover definitions), or a
Javascript solution that sets the visibility attribute of the layer's style
definition, or switches the layer's CSS class from a visible to an hidden
one.

> What's the difference between content's logical order and
> visual order?

A classic example would be a page's navigation sidebar. Visually, you may
want it to appear on the left-hand side of the page, but it could make sense
in the source code to have the <div> after the page's main content (so that
users with text browsers, for instance, get the content first, and the
navigation later).

> Is there any reference or good website using layers that I
> can take a look at? Thanks.

More and more sites are now starting to go for xhtml+css only layouts,
abandoning "visual" support for older, non-compliant browsers
(*cough*Netscape 4.x*cough*). I couldn't think of a clear leader in the
field, but http://devedge.netscape.com does a good job (although they don't
actually re-order the layers as explained above).

Hope this helps,

Patrick
________________________________
Patrick H. Lauke
Webmaster
External Relations Division
Faraday House
University of Salford
Greater Manchester
M5 4WT

Tel: +44 (0) 161 295 4779

e-mail: [log in to unmask]
www.salford.ac.uk

A GREATER MANCHESTER UNIVERSITY