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In fact, the HTML code is not valid. See, e.g.,
http://validator.w3.org/check?uri=http://www.python.org/dev/doc/devel/lib/boolean.html&charset=%28detect+automatically%29&doctype=Inline&ss=1&sp=1&outline=1&No200=1&verbose=1

And the link-tag which links to the next page appears twice.
E.g., there is
<LINK rel="next" href="comparisons.html">
twice on the page
http://www.python.org/dev/doc/devel/lib/boolean.html

This is very annoying when using the link toolbar for
Mozilla Firefox.