Cari amici,
quando metto un tag </br> fra un link e l'altro la validazione mi restituisce:

end tag for element "br" which is not open.
…per stampare">Stampa articolo</a></br><a href="allegati/aaaaaaaaaa">aaaaaaaaa✉
The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.

Questo il codice:
<div id="allegatipagina">Stampa articolo<?echo $allegato1 ?><?echo $allegato2 ?><?echo $allegato3 ?></div>