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>
    <pages>
      <page pageid="232" ns="0" title="D-Link DIR-300 (вервия C1E)" />
      <page pageid="292" ns="0" title="Настройка подключение в Windows 10" />
      <page pageid="293" ns="0" title="Настройка подключение в Windows 8" />
      <page pageid="294" ns="0" title="Настройка почты в Microsoft Outlook" />
    </pages>
  </query>
</api>