good resource for CSS.

The method they suggest to hide "Skip navigation" is really useful:

.off-left {
 position: absolute;
 left: -999px;
 width: 990px;
}

The beauty of this technique is that it enables using as much text as we feel appropriate, and the elements we feel appropriate. Imagine placing instructive text about the accessibility features of the page off left (as well as on the site's accessibility statement).