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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20140420204425" timestamp="2014-04-20T20:44:25Z" ns="0" title="Increase network throughput" />
        <page value="20140621203424" timestamp="2014-06-21T20:34:24Z" ns="0" title="Plans" />
        <page value="20140715194248" timestamp="2014-07-15T19:42:48Z" ns="0" title="Fix network on Windows" />
        <page value="20140808171109" timestamp="2014-08-08T17:11:09Z" ns="0" title="Receive encrypted mail" />
        <page value="20141116182149" timestamp="2014-11-16T18:21:49Z" ns="0" title="Network configuration" />
        <page value="20150523151241" timestamp="2015-05-23T15:12:41Z" ns="0" title="API Detail" />
        <page value="20150714173623" timestamp="2015-07-14T17:36:23Z" ns="0" title="Generating DKIM Key" />
        <page value="20150715034606" timestamp="2015-07-15T03:46:06Z" ns="0" title="SPF Record" />
        <page value="20150819135045" timestamp="2015-08-19T13:50:45Z" ns="0" title="Disable IPv6 Privacy" />
        <page value="20160105225701" timestamp="2016-01-05T22:57:01Z" ns="0" title="Create your first instance" />
      </results>
    </querypage>
  </query>
</api>