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HTML is good for debugging, but is unsuitable for application use.
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To see the non HTML representation of the XML format, set format=xml.
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<?xml version="1.0"?>
<api>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20180405141827" timestamp="2018-04-05T14:18:27Z" ns="0" title="メインページ" />
        <page value="20180405143724" timestamp="2018-04-05T14:37:24Z" ns="0" title="Wikiducca:新規ページの作成" />
        <page value="20181205081236" timestamp="2018-12-05T08:12:36Z" ns="0" title="[ALEXANDROS]" />
        <page value="20190105114323" timestamp="2019-01-05T11:43:23Z" ns="0" title="花サフラン" />
        <page value="20190105120622" timestamp="2019-01-05T12:06:22Z" ns="0" title="Base Ball Bear" />
        <page value="20190105121021" timestamp="2019-01-05T12:10:21Z" ns="0" title="雑煮" />
        <page value="20190105123104" timestamp="2019-01-05T12:31:04Z" ns="0" title="CentOS6へのGitBucketインストール" />
        <page value="20190105123216" timestamp="2019-01-05T12:32:16Z" ns="0" title="R&amp;B" />
        <page value="20190105123400" timestamp="2019-01-05T12:34:00Z" ns="0" title="松任谷由実" />
        <page value="20190105123552" timestamp="2019-01-05T12:35:52Z" ns="0" title="Billboard JAPAN" />
      </results>
    </querypage>
  </query>
</api>