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>
    <backlinks gblcontinue="0|Main_Page|2670" />
  </query-continue>
  <query>
    <pages>
      <page pageid="748" ns="0" title="Old Main page" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-01-06T19:58:28Z" lastrevid="3108" counter="" length="23" redirect="" new="" />
      <page pageid="1950" ns="0" title="Portal:Superleague" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="20252" counter="" length="1969" />
      <page pageid="1975" ns="0" title="Portal:Supercup" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-01-04T14:30:32Z" lastrevid="31610" counter="" length="4401" />
      <page pageid="1979" ns="0" title="Portal:Masters Series" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="27224" counter="" length="3856" />
      <page pageid="1984" ns="0" title="Portal:Formula Sprint 2" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32781" counter="" length="4413" />
      <page pageid="2042" ns="14" title="Category:Former POTD" contentmodel="wikitext" pagelanguage="en-gb" touched="2013-02-20T15:11:11Z" lastrevid="13475" counter="" length="157" />
      <page pageid="2098" ns="0" title="Portal:Images project" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="8914" counter="" length="1287" />
      <page pageid="2140" ns="0" title="Portal:Endurance Championship" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="11588" counter="" length="2937" />
      <page pageid="2154" ns="10" title="Template:Portals Navbar" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="32766" counter="" length="903" />
      <page pageid="2580" ns="0" title="Portal:World Sport Series" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-02-02T01:14:35Z" lastrevid="27225" counter="" length="3904" />
    </pages>
  </query>
</api>