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="20160425013018" timestamp="2016-04-25T01:30:18Z" ns="0" title="Main Page" />
        <page value="20160425013317" timestamp="2016-04-25T01:33:17Z" ns="0" title="Mainpage" />
        <page value="20160425193950" timestamp="2016-04-25T19:39:50Z" ns="0" title="Monochromatic color scheme" />
        <page value="20160425194514" timestamp="2016-04-25T19:45:14Z" ns="0" title="Split complementary color scheme (accented)" />
        <page value="20160425202044" timestamp="2016-04-25T20:20:44Z" ns="0" title="Analogous color scheme (accented)" />
        <page value="20160425205407" timestamp="2016-04-25T20:54:07Z" ns="0" title="Tetradic color scheme" />
        <page value="20160425205623" timestamp="2016-04-25T20:56:23Z" ns="0" title="Triadic color scheme" />
        <page value="20160425210014" timestamp="2016-04-25T21:00:14Z" ns="0" title="Analogous color scheme" />
        <page value="20160426232038" timestamp="2016-04-26T23:20:38Z" ns="0" title="Other color schemes" />
        <page value="20160426233952" timestamp="2016-04-26T23:39:52Z" ns="0" title="Color blindness" />
      </results>
    </querypage>
  </query>
</api>