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>
    <alllinks galcontinue="Webmail,_Outlook_and_Exchange" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Flightradar" missing="" />
      <page pageid="6" ns="0" title="DVB Devices" />
      <page pageid="19" ns="0" title="EarthOnline" />
      <page pageid="12" ns="0" title="EumetCast.de Website" />
      <page pageid="8" ns="0" title="EumetCast Dissemination Service" />
      <page pageid="13" ns="0" title="FTP Server" />
      <page pageid="11" ns="0" title="Online Cloud" />
      <page pageid="5" ns="0" title="Operating System Specifications" />
      <page pageid="4" ns="0" title="PC Hardware Specifications" />
      <page pageid="10" ns="0" title="Remote Sessions and Desktop" />
    </pages>
  </query>
</api>