The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
Byte-Order Mark found in UTF-8 File.
The Unicode Byte-Order Mark (BOM) in UTF-8 encoded files is known to cause problems for some text editors and older browsers. You may want to consider avoiding its use until it is better supported.
<td><a href="Avvento3.htm"><img src="TraNatAvv3a.gif" alt="" border="0"></td>
The next message, "start tag was here
"
points to the particular instance of the tag in question); the
positional indicator points to where the validator expected you to close the
tag.
<td><a href="Avvento3.htm"><img src="TraNatAvv3a.gif" alt="" border="0"></td>
…counter/counter.js"></script><noscript><div class="statcounter"><a title="web …
The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").