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>
    <random>
      <page id="6440" ns="0" title="大和国十市郡西宮庄(荘園)" />
      <page id="330" ns="0" title="富士郡古家郷(静岡県)" />
    </random>
  </query>
</api>