In Confluence 6.X and below, assistive links are empty. This is reporting errors on accessibility reports. If you check the HTML(inspect), the following href will not be linked to anything:

<a href="#header-menu-bar">
Skip to header menu
</a>

<a href="#navigation">
Skip to action menu
</a>

<a href="#quick-search-query">
Skip to quick search
</a>

<a href="#page-metadata-end" class="assistive">
Skip to end of metadata
</a>

Customers can workaround the errors by removing(from main.vmd file) the lines like:

 <li><a href="#quick-search-query">$action.getText("assistive.skiplink.to.quick.search")</a></li>

They will suppress the errors messages from the accessibility analysis.

If these links are added properly, we could have the menu correctly built for screen readers, which improves the accessibility of the page.

Use http://wave.webaim.org/ for accessibility analysis.