.an-anchorpoint
Use an-anchorpoints as internal bookmarks for your webpage. They area
not meant to have any visible content by default. All anchorpoints
must contain a div, which does the actual work of "anchoring." This
is due to limitations in CSS and HTML. The outer div is positioned
relatively, and the inner div is positioned absolutely.
<div class="an-anchorpoint">
<div id="anchorpoint"></div>
</div>