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>
    <allimages gaicontinue="A_La_Cravache.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2860" ns="6" title="File:&quot;Cyrk&quot; Poster Miedza-Tomaszewski.jpg" />
      <page pageid="5708" ns="6" title="File:&quot;Dandies&quot; with Dominique jando (2018).png" />
      <page pageid="6231" ns="6" title="File:2019 Circopedia Award.jpg" />
      <page pageid="8221" ns="6" title="File:251 rue St Honore.jpg" />
      <page pageid="2953" ns="6" title="File:3 Haucks @ Scala.jpeg" />
      <page pageid="2954" ns="6" title="File:3 Houcs.jpeg" />
      <page pageid="2952" ns="6" title="File:3 Houcs at Hansa Theater.jpeg" />
      <page pageid="3003" ns="6" title="File:3 Rivels (1955).jpg" />
      <page pageid="5953" ns="6" title="File:5 Continents Program Cover.jpg" />
      <page pageid="2482" ns="6" title="File:ALFREDO CODONA (1920).jpg" />
    </pages>
  </query>
</api>