You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20190508170959" timestamp="2019-05-08T17:09:59Z" ns="0" title="Un projet au gré de la Providence" />
        <page value="20190508171100" timestamp="2019-05-08T17:11:00Z" ns="0" title="Capacitation numérique" />
        <page value="20190508233016" timestamp="2019-05-08T23:30:16Z" ns="0" title="Notion de perférent" />
        <page value="20190511083315" timestamp="2019-05-11T08:33:15Z" ns="0" title="Apostolat des machines" />
        <page value="20190511094844" timestamp="2019-05-11T09:48:44Z" ns="0" title="Accueil" />
      </results>
    </querypage>
  </query>
</api>