This is something that has bugged me for a long time.
When you click on an anchor link in the page's TOC, or from an external link, the anchor is masked by the black header.
Here's an example, the PPA entry to the Glossary that I just created:https://www.freecadweb.org/wiki/Glossary#PPA
Here's what it looks like:
The anchor and the first line are masked.
Tested in Firefox 51.0.1 and Chromium 56.0.
It would really be great if you guys could fix this.