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="7" ns="0" title="1996 - 2002 Viper V-10" />
      <page pageid="9" ns="0" title="1996 - 1998 Jeep Grand Cherokee V-8 ZJ" />
      <page pageid="10" ns="0" title="1996 - 1999 Jeep Cherokee I-6 4.0 XJ" />
      <page pageid="11" ns="0" title="2000 - 2001 Jeep Cherokee I-6 4.0 XJ" />
      <page pageid="14" ns="0" title="CCD Bus" />
      <page pageid="15" ns="0" title="PCM IC Overview" />
    </pages>
  </query>
</api>