[orca-list] Invisible webpage elements meant for AT users not showing

[Lukas Loehrer <listaddr1 gmx net>]

Hi all,

the discussion about image links and dradio.de made me notice the
following problem:

When viewed with a text browser like w3m, the page http://dradio.de";
has a "Zum Inhalt" (Skip to main content" lik at the top. This link is
not visible in  Firefox with orca, and here is why:

The markup looks like this:

a name="oben"></a>

<a href="/#hauptinhalt" class="inv">Zum Inhalt</a>


Notice the class="inv" attribute. In the stylesheet
http://dradio.de/styles/styles_screen.css, the declaration for this
class looks like this:

.inv {display:none}

Now, Firefox correctly hides elements with display=none in the
accessible tree, which is what AT ultimately uses to display the page.
On the other hand, the above is clearly meant to be seen by AT users.

I was wondering:
From the perspective of the AT maker, what would be the correct way to hide
a page element from sighted users and keep it accessible to AT.

Also, any idea waht could be done about situations like the above?

Best regards, Lukas