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>
    <pages>
      <page pageid="1426" ns="0" title="BiTfOlK" />
      <page pageid="1674" ns="0" title="Films and TV I have made Jenny watch" />
      <page pageid="1319" ns="0" title="The following signatures couldn&#039;t be verified" />
      <page pageid="1666" ns="0" title="Twitter/Why unfollowed" />
      <page pageid="1644" ns="0" title="Wimbledon Greyhound Welfare/Meet and Greet FAQ" />
      <page pageid="1300" ns="0" title="Xen hosting" />
    </pages>
  </query>
</api>