Closing span are not considered before an open link when parsing XHTML

For the need of a project I am parsing the HTML code generated by the wysiwyg editor in order to do some modifications on the blocks and after render it as XWiki syntax.

The problem is that in a particular case the html code is not rendered as expected.

For example if I try to render the following code, composed of span with some CSS classes followed by xwiki link:

<span class="label label-success noticeid">TEST</span><span class="wikiexternallink"><a href="http://www.google.fr/">LINK</a></span>

Actual result:

(% class="label label-success noticeid" %)TEST[[LINK>>url:http://www.google.fr/]]

See demo here

Expected result :

(% class="label label-success noticeid" %)TEST(%%)[[LINK>>url:http://www.google.fr/]]

If I convert the xwiki syntax result obtained from the parsing of the initial HTML code and convert it to HTML syntax , (reverse rendering), the result will be different from the initial HTML code :

<p><span class="label label-success noticeid">TEST<span class="wikiexternallink"><a href="http://www.google.fr/">LINK</a></span></span></p>

See the demo here

Note that, if we put a space between the first and the 2nd span on the initial HTML code, the rendering result will be correct.

<span class="label label-success noticeid">TEST</span> <span class="wikiexternallink"><a href="http://www.google.fr/">LINK</a></span>

The result will be :

(% class="label label-success noticeid" %)TEST(%%) [[LINK>>url:http://www.google.fr/]]

See a demo here