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-continue>
    <allredirects garcontinue="History_of_Computers_-_Schrodinger&#039;s_Cat|2820" />
  </query-continue>
  <query>
    <pages>
      <page pageid="340" ns="0" title="History of Computers - Virtual Keyboard" />
      <page pageid="632" ns="0" title="History of Computers - International Business Machines" />
      <page pageid="801" ns="1" title="Talk:Earth Science 7- Bangui, Central African Republic" />
      <page pageid="1112" ns="0" title="Earth Science 7- Antarctica/ Austrailia/ New Zealand Period 1" />
      <page pageid="1371" ns="0" title="CorelDRAW" />
      <page pageid="1381" ns="0" title="1996- Present History of Computers - Push Technology" />
      <page pageid="1382" ns="0" title="Norbert Wiener" />
      <page pageid="2240" ns="0" title="Alan turing" />
      <page pageid="2886" ns="0" title="Douglas Engelbart" />
      <page pageid="2887" ns="0" title="Athlon" />
    </pages>
  </query>
</api>