Tidy (vers 26th July 1999) Parsing "plankton.html"
line 2 column 1 - Error: <header> is not recognized!
line 2 column 1 - Warning: discarding unexpected <header>
line 25 column 3 - Warning: malformed comment
line 154 column 17 - Warning: malformed comment
line 154 column 17 - Warning: malformed comment
line 770 column 1 - Warning: inserting missing 'title' element

"plankton.html" appears to be HTML 2.0
6 warnings/errors were found!

This document has errors that must be fixed before
using HTML Tidy to generate a tidied up version.

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To learn more about Tidy see http://www.w3.org/People/Raggett/tidy/
Please send bug reports to Dave Raggett care of <html-tidy@w3.org>
Lobby your company to join W3C, see http://www.w3.org/Consortium