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="6" ns="0" title="Data Assimilation For Fluid Dynamic Models" />
      <page id="787" ns="0" title="Interpretation of Computer Science Educational Data for the State of Wisconsin and a Static Analysis Driven Approach to Classifying Student Code" />
    </random>
  </query>
</api>