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="Kuu_smiling.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1469" ns="6" title="File:Crows on power line.jpg" />
      <page pageid="1410" ns="6" title="File:Four-eyed fangirl.jpg" />
      <page pageid="1459" ns="6" title="File:GuriTownMap.jpg" />
      <page pageid="1839" ns="6" title="File:HRTrain.jpg" />
      <page pageid="1391" ns="6" title="File:Haibaniki Logo.png" />
      <page pageid="1436" ns="6" title="File:Hana complaining.jpg" />
      <page pageid="1371" ns="6" title="File:Hikari with glowing halo.jpg" />
      <page pageid="1468" ns="6" title="File:Kana with machinery.jpg" />
      <page pageid="1411" ns="6" title="File:Kana without halo.jpg" />
      <page pageid="1415" ns="6" title="File:Kuramori Young Reki Washi.jpg" />
    </pages>
  </query>
</api>