Help files (at least en_utf8) that do not comply with XHTML 1.0 Strict and the first error found for each file:

127.0.0.1/moodle/help.php?file=reading.html:124:37:3086136980.65:E: document type does not allow element "p" here; missing one of "object", "ins", "del", "map", "button" start-tag
127.0.0.1/moodle/help.php?file=text.html:123:32:3085817492.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?module=wiki&file=howtowiki.html:118:66:3086960276.108:E: there is no attribute "target"
127.0.0.1/moodle/help.php?module=data&file=usepreset.html:112:95:3087222420.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?module=data&file=participants.html:112:95:3087009428.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?module=moodle&file=textformat.html:137:4:3087730324.79:E: end tag for element "ul" which is not open
127.0.0.1/moodle/help.php?module=wiki&file=htmlmode.html:115:3:3087165076.65:E: document type does not allow element "dl" here; missing one of "object", "ins", "del", "map", "button" start-tag
127.0.0.1/moodle/help.php?module=data&file=savepreset.html:112:95:3087554196.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?module=data&file=fields.html:112:95:3087738516.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?file=participantswithselectedusers.html:113:9:3086415508.108:E: there is no attribute "align"
127.0.0.1/moodle/help.php?module=resource&file=window.html:127:4:3086124692.65:E: document type does not allow element "b" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag