I got rid of all validation errors, except this last one. I pasted/use this code in the Banner Manager, and it returns 8 validation errors alone (as soon as I disable this banner my website becomes fully valid):
Code:
<!-- PayPal Logo --><table border="0" cellpadding="10" cellspacing="0" align="center"><tr><td align="center"></td></tr>
<tr><td align="center"><a href="#" onclick="javascript:window.open('https://www.paypal.com/cgi-bin/webscr?cmd=xpt/popup/OLCWhatIsPayPal-outside','olcwhatispaypal','toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, width=400, height=350');"><img src="https://www.paypal.com/en_US/i/bnr/horizontal_solution_PP.gif" border="0" alt="Solution Graphics"></a></td></tr></table><!-- PayPal Logo -->
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