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On a file both gave me different error messages, neither set of which made any sense to me. HTML-Tidy complained of a missing </div>, and later of an unmatched </div>. w3c.org complained of closing a table tag which was not open. Neither bore any resemblence to what I saw in the code :(
So I looked carefully at the areas where the offending lines were, and found the culprit:
The error was clearly the incorrectly nested table and div tags, but it confused both SGML parsers so completely that they were unable to identify the error. But they certainly knew that something was wrong!<div class="C">
<table>
...
lots and lots of lines of table
...
</div>
</table>
