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>
    <pages>
      <page ns="0" title="Electric Cigarette Reviews" missing="" />
      <page ns="0" title="Models with e cigarette" missing="" />
      <page pageid="2" ns="0" title="Current Events" />
      <page pageid="92" ns="0" title="Discomedusa lobata" />
      <page pageid="243" ns="0" title="Haliclystus antarcticus" />
      <page pageid="247" ns="0" title="Mastigias papua" />
      <page pageid="179" ns="0" title="REVSYS" />
      <page pageid="93" ns="0" title="Stygiomedusa gigantea" />
      <page pageid="178" ns="0" title="Tree of Life" />
    </pages>
  </query>
</api>