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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="20140628194710" timestamp="2014-06-28T19:47:10Z" ns="0" title="Tecuilhuitontli" />
        <page value="20140706031519" timestamp="2014-07-06T03:15:19Z" ns="0" title="Huixtocihuatl" />
        <page value="20140706031623" timestamp="2014-07-06T03:16:23Z" ns="0" title="Codex Telleriano-Remensis" />
        <page value="20140706060917" timestamp="2014-07-06T06:09:17Z" ns="0" title="Trecena" />
        <page value="20140712113613" timestamp="2014-07-12T11:36:13Z" ns="0" title="Octli" />
        <page value="20140720205823" timestamp="2014-07-20T20:58:23Z" ns="0" title="Template/Recent pages" />
        <page value="20140729224104" timestamp="2014-07-29T22:41:04Z" ns="0" title="Main Page" />
        <page value="20140804050955" timestamp="2014-08-04T05:09:55Z" ns="0" title="Map of mexico" />
        <page value="20140807182444" timestamp="2014-08-07T18:24:44Z" ns="0" title="Huey Tecuilhuitl" />
        <page value="20141001040737" timestamp="2014-10-01T04:07:37Z" ns="0" title="Lienzo de Zacatepec" />
      </results>
    </querypage>
  </query>
</api>