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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="20121019222428" timestamp="2012-10-19T22:24:28Z" ns="0" title="Comparison of online backup services" />
        <page value="20121020023827" timestamp="2012-10-20T02:38:27Z" ns="0" title="File Sharing, Syncing and Online Backup" />
        <page value="20121025205255" timestamp="2012-10-25T20:52:55Z" ns="0" title="WP in General" />
        <page value="20121025211122" timestamp="2012-10-25T21:11:22Z" ns="0" title="Post to your WordPress.org site using email" />
        <page value="20121025211604" timestamp="2012-10-25T21:16:04Z" ns="0" title="WP Plugins" />
        <page value="20121025212136" timestamp="2012-10-25T21:21:36Z" ns="0" title="Postie Plugin" />
        <page value="20121113190551" timestamp="2012-11-13T19:05:51Z" ns="0" title="Sandbox" />
        <page value="20130219184511" timestamp="2013-02-19T18:45:11Z" ns="0" title="Online Backup Services" />
        <page value="20130421020248" timestamp="2013-04-21T02:02:48Z" ns="0" title="WordPress" />
        <page value="20130421060918" timestamp="2013-04-21T06:09:18Z" ns="0" title="Joomla! Admin" />
      </results>
    </querypage>
  </query>
</api>