RE: Would incorrectly implemented landmarks constitute a WCAG failure?

> Is there any kind of landmark failure that you'd consider a hard WCAG
failure?

* Incorrect markup would be something like coding a navigation bar as
<main> or using <header> for content, where the actual header (<h1> ...) is
somewhere else. 
* Using more than one <header> and/or <footer> for a sectioning or root
element.

Besides that, there are a couple of other issues, which may cause problems,
but are not necessarily violations:

* unnecessary nesting, e.g.
<nav><nav>
... list of links ...
</nav></nav>
* Identical labelling or not labelling identical elements (mostly <nav> and
<aside>). There may be exceptions when two or more regions contain identical
content.
* I would also consider omitting content from any region a problem in
certain situations. All content should be contained in a region. There may
be exceptions.

Jan


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