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>
    <links gplcontinue="691|0|2023_Formula_Sprint_2_season" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="2016 Supercup United States Grand Prix" missing="" contentmodel="wikitext" pagelanguage="en-gb" />
      <page pageid="5286" ns="0" title="2021 Formula Challenge season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32060" counter="" length="50131" />
      <page pageid="5285" ns="0" title="2021 Supercup season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-01-04T14:30:32Z" lastrevid="32364" counter="" length="13455" />
      <page pageid="5284" ns="0" title="2021 Superleague Lights season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32992" counter="" length="14236" />
      <page pageid="5283" ns="0" title="2021 Superleague season" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-12-16T13:50:36Z" lastrevid="32999" counter="" length="14733" />
      <page pageid="5433" ns="0" title="2022 Formula Sprint 1 season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32844" counter="" length="12209" />
      <page pageid="5435" ns="0" title="2022 Formula Sprint 2 season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-07T20:10:41Z" lastrevid="32986" counter="" length="32838" />
      <page pageid="5431" ns="0" title="2022 Superleague season" contentmodel="wikitext" pagelanguage="en-gb" touched="2023-12-16T13:51:59Z" lastrevid="33001" counter="" length="8264" />
      <page pageid="5457" ns="0" title="2022 Superlights season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32993" counter="" length="12461" />
      <page pageid="5473" ns="0" title="2023 Formula Sprint 1 season" contentmodel="wikitext" pagelanguage="en-gb" touched="2024-02-13T21:08:08Z" lastrevid="32990" counter="" length="26881" />
    </pages>
  </query>
</api>