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I mistakenly wrote at the beginning of my HTML document: <?xml version="1.0" encoding="ISO-8859-1"> instead of <?xml version="1.0" encoding="ISO-8859-1"?> The validator first made me replace <img.../> with <img...>, <hr/> with <hr>, and <meta.../> with <meta...>. Then it complained the page was invalid but gave no line number, no error message, just an inch of blank background and the standard footer.
Sébastien, could you please attach a minimal sample document that we can use to reproduce this problem to the bug report?
This is a case of the DOCTYPE getting lost due to an unterminated XML Declaration PI. This has been fixed in CVS in the course of cleaning up fallback behaviour.