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>
    <pageswithprop pwpcontinue="9776" />
  </query-continue>
  <query>
    <pageswithprop>
      <page pageid="5876" ns="2" title="User:SirKitKat" value="User: sirKitKat" />
      <page pageid="6858" ns="2" title="User:Robbert-slakhorst" value="User: robbert-slakhorst" />
      <page pageid="6859" ns="3" title="User talk:Robbert-slakhorst" value="User talk: robbert-slakhorst" />
      <page pageid="7150" ns="2" title="User:Steveningelbrecht" value="User: steveningelbrecht" />
      <page pageid="7151" ns="2" title="User:Annickdw" value="User: annickdw" />
      <page pageid="7832" ns="0" title="Translation Sandbox/en" value="Translation Sandbox" />
      <page pageid="7837" ns="0" title="Translation (wiki)/en" value="Translation (wiki)" />
      <page pageid="8921" ns="0" title="Map editing/en" value="Map editing" />
      <page pageid="8924" ns="0" title="Translate waze (client text) to your local language/en" value="Translate waze (client text) to your local language" />
      <page pageid="9758" ns="0" title="Translation Sandbox/nl" value="Sandbox Vertalingen" />
    </pageswithprop>
  </query>
</api>