#data
<p xmlns="http://www.w3.org/1999/xhtml"
    class="abc"
>a</p>
#errors

#data
<p xmlns="http://www.w3.org/1999/xhtml/???"
    class="abc"
>a</p>
#errors
/p;unknown namespace element;u

#data
<p xmlns=""
    class="abc"
>a</p>
#errors
/p;unknown namespace element;u

#data
<p xmlns=""
    class="abc
abc"
>a</p>
#errors
/p;unknown namespace element;u
/p/@class;duplicate token;w

#data
<p xmlns:html="http://www.w3.org/1999/xhtml"
    html:class="abc"
>a</p>
#errors
/p;unknown namespace element;u
/p/@class;attribute not defined;m

#data
<title xmlns="http://www.w3.org/2005/Atom"
    class="abc"
>a</title>
#errors
/title/@class;attribute not defined;m

#data
<title xmlns="http://www.w3.org/2005/Atom"
    class="abc abc"
>a</title>
#errors
/title/@class;attribute not defined;m
/title/@class;duplicate token;w

#rss2
#data
<title class="abc abc">s</title>
#errors
title/@class;attribute not defined;m
title/@class;duplicate token;w