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>
    <recentchanges rccontinue="20171029033215|159" />
  </query-continue>
  <query>
    <recentchanges>
      <rc type="edit" ns="0" title="hhvm" pageid="11" revid="169" old_revid="94" rcid="169" timestamp="2018-04-25T14:15:15Z" />
      <rc type="new" ns="0" title="Apache Traffic Serverをインストールする" pageid="67" revid="168" old_revid="0" rcid="168" timestamp="2018-04-15T07:54:17Z" />
      <rc type="edit" ns="0" title="メインページ" pageid="3" revid="167" old_revid="165" rcid="167" timestamp="2018-04-15T07:48:45Z" />
      <rc type="new" ns="0" title="Ubuntu 17.10のネットワークの設定" pageid="66" revid="166" old_revid="0" rcid="166" timestamp="2018-03-27T10:29:52Z" />
      <rc type="edit" ns="0" title="メインページ" pageid="3" revid="165" old_revid="163" rcid="165" timestamp="2018-03-27T10:22:32Z" />
      <rc type="new" ns="0" title="apt updateのGPG errorのNO PUBKEY F60F4B3D7FA2AF80を解決する方法" pageid="65" revid="164" old_revid="0" rcid="164" timestamp="2017-12-09T04:35:12Z" />
      <rc type="edit" ns="0" title="メインページ" pageid="3" revid="163" old_revid="156" rcid="163" timestamp="2017-12-09T04:31:48Z" />
      <rc type="edit" ns="0" title="Ubuntuの環境構築" pageid="54" revid="162" old_revid="161" rcid="162" timestamp="2017-10-29T03:50:54Z" />
      <rc type="edit" ns="0" title="Ubuntuの環境構築" pageid="54" revid="161" old_revid="158" rcid="161" timestamp="2017-10-29T03:32:55Z" />
      <rc type="new" ns="0" title="Ubuntuにifconfigをインストールする" pageid="64" revid="160" old_revid="0" rcid="160" timestamp="2017-10-29T03:32:49Z" />
    </recentchanges>
  </query>
</api>