When link elements are commented out, the spider/parser
identifies them as legitimate links for checking.
I don't know if this markup will come through as intended,
but it is typical of the cases I have seen.
<!-- link rel="glossary" href="/Glossary.htm"
title="Example" type="text/html" / -->
Where links are commented out like this, I suggest they
should not be followed.
Fixed in upcoming 1.0 release. A proper HTML parser is now used and links are identifed via XPath expressions. Comments are therefore ignored, as are element/attribute pairs that can't be links, even if they are.