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="17592" ns="0" title="Chevy Trucks For Sale-Great American Trucks At Super Cheap Prices" />
      <page id="21797" ns="0" title="Monster Beats by Dr. Dre Tour In-Ear Headphones attribute a special and stylish structure" />
    </random>
  </query>
</api>