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="79971" ns="6" title="File:GameLogo World of Tanks.png" contentmodel="wikitext" pagelanguage="en" touched="2016-12-01T16:59:37Z" lastrevid="243830" counter="1034" length="20" />
      <page pageid="79544" ns="6" title="File:GameLogo World of Warships.png" contentmodel="wikitext" pagelanguage="en" touched="2019-09-25T09:43:01Z" lastrevid="287147" counter="584" length="20" />
      <page pageid="80258" ns="6" title="File:GamePromo World of Tanks.png" contentmodel="wikitext" pagelanguage="en" touched="2019-06-25T13:08:04Z" lastrevid="285141" counter="21" length="20" />
      <page pageid="79969" ns="6" title="File:GamePromo World of Warships.png" contentmodel="wikitext" pagelanguage="en" touched="2016-06-29T19:41:50Z" lastrevid="142022" counter="0" length="20" new="" />
    </pages>
  </query>
</api>