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="8378" ns="0" title="豊後国国崎郡田原別符(荘園)" />
      <page id="320" ns="0" title="長下郡老馬郷(静岡県)" />
    </random>
  </query>
</api>