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="20180121224302" timestamp="2018-01-21T22:43:02Z" ns="0" title="Заглавная страница" />
        <page value="20180122141917" timestamp="2018-01-22T14:19:17Z" ns="0" title="Кроссовер" />
        <page value="20180122165845" timestamp="2018-01-22T16:58:45Z" ns="0" title="Форма кузова легкового автомобиля" />
        <page value="20180123123643" timestamp="2018-01-23T12:36:43Z" ns="0" title="Toyota Sprinter Carib" />
        <page value="20180123190326" timestamp="2018-01-23T19:03:26Z" ns="0" title="1949—1956 Ford" />
        <page value="20180124010522" timestamp="2018-01-24T01:05:22Z" ns="0" title="Plymouth" />
        <page value="20180124121328" timestamp="2018-01-24T12:13:28Z" ns="0" title="Wartburg" />
        <page value="20180124155707" timestamp="2018-01-24T15:57:07Z" ns="0" title="Победа (наброски)" />
        <page value="20180125184659" timestamp="2018-01-25T18:46:59Z" ns="0" title="НАМИ-1" />
        <page value="20180128025412" timestamp="2018-01-28T02:54:12Z" ns="0" title="Газораспределительный механизм" />
      </results>
    </querypage>
  </query>
</api>