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-continue>
    <allfileusages gafcontinue="Caliandar.png|8464" />
  </query-continue>
  <query>
    <pages>
      <page pageid="8402" ns="0" title="Паляпшаем гараж-38 інструменты і навігацыя" />
      <page pageid="8527" ns="0" title="Куток раварыста" />
      <page pageid="8915" ns="2" title="Участник:Баярка Максим" />
      <page pageid="8942" ns="2" title="Участница:Валасюк Ксенія" />
      <page pageid="9167" ns="0" title="Справаздача 2019" />
    </pages>
  </query>
</api>