I find it very annoying when I click on a link that references an internal part of a document, and I fail to see what I was trying to get by clicking it.  It happens the most when a webmaster puts an anchor name near the bottom of the document.  A browser "tries" to scroll such that the referenced content is located at the top of the page, but this is not possible when there is no more page to scroll.  Even if it does manage to do so, it is still helpful to highlight it somehow after the move within the document.

Ideally, Firefox would use a visual cue to fix this, but until then, I use a little JavaScript trick to do the same.  Here is an example:

http://www.lawyerseek.com/Glossary.html#black-box-warning.  I think it's a powerful usability enhancement.

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