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="20140921070709" timestamp="2014-09-21T07:07:09Z" ns="0" title="Los colores" />
        <page value="20141020182759" timestamp="2014-10-20T18:27:59Z" ns="0" title="Idiomas" />
        <page value="20150201080446" timestamp="2015-02-01T08:04:46Z" ns="0" title="El comparativo" />
        <page value="20150208101349" timestamp="2015-02-08T10:13:49Z" ns="0" title="Meses del año" />
        <page value="20150209202717" timestamp="2015-02-09T20:27:17Z" ns="0" title="Emisoras de radio" />
        <page value="20150314181340" timestamp="2015-03-14T18:13:40Z" ns="0" title="Página principal" />
        <page value="20150314183713" timestamp="2015-03-14T18:37:13Z" ns="0" title="Wake" />
        <page value="20150314185954" timestamp="2015-03-14T18:59:54Z" ns="0" title="Awake" />
        <page value="20150314190056" timestamp="2015-03-14T19:00:56Z" ns="0" title="Wake up" />
        <page value="20150314190452" timestamp="2015-03-14T19:04:52Z" ns="0" title="Awaken" />
      </results>
    </querypage>
  </query>
</api>