<p><a href="http://example.com">reference link</a></p>
<p><a href="http://example.com">one</a> with a semantic name</p>
<p>[one][404] with no definition</p>
<p><a href="http://example.com">multiline
one</a> defined on 2 lines</p>
<p><a href="http://example.com">one</a> with a mixed case label and an upper case definition</p>
<p><a href="http://example.com">one</a> with the a label on the next line</p>
<p><a href="http://example.com"><code>link</code></a></p>