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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="20140303091619" timestamp="2014-03-03T09:16:19Z" ns="0" title="Module:Documentation" />
        <page value="20140303091758" timestamp="2014-03-03T09:17:58Z" ns="0" title="Module:Arguments" />
        <page value="20140303094843" timestamp="2014-03-03T09:48:43Z" ns="0" title="Module:Wikibase" />
        <page value="20140318115603" timestamp="2014-03-18T11:56:03Z" ns="0" title="Transcripciones en curso" />
        <page value="20140320053549" timestamp="2014-03-20T05:35:49Z" ns="0" title="Index talk remarks" />
        <page value="20140321100007" timestamp="2014-03-21T10:00:07Z" ns="0" title="Transcripciones" />
        <page value="20140321160443" timestamp="2014-03-21T16:04:43Z" ns="0" title="Embarques de Zenon de Quevedo" />
        <page value="20140404090806" timestamp="2014-04-04T09:08:06Z" ns="0" title="Dictado y habla" />
        <page value="20140404090836" timestamp="2014-04-04T09:08:36Z" ns="0" title="Dictado y habla, solución de problemas" />
        <page value="20140404092751" timestamp="2014-04-04T09:27:51Z" ns="0" title="Guia-Album del viagero en la Provincia de Guipuzcoa" />
      </results>
    </querypage>
  </query>
</api>