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="20048" ns="0" title="GlueX Software Meeting, December 20, 2021" contentmodel="wikitext" pagelanguage="en" touched="2021-12-20T18:47:24Z" lastrevid="109918" counter="1096" length="5473" />
      <page pageid="15209" ns="0" title="May 19, 2016 Calorimeter" contentmodel="wikitext" pagelanguage="en" touched="2016-06-01T19:17:06Z" lastrevid="75152" counter="5775" length="3487" />
      <page pageid="8524" ns="0" title="Start Counter Background Studies" contentmodel="wikitext" pagelanguage="en" touched="2015-04-01T01:54:24Z" lastrevid="65246" counter="5650" length="4456" />
      <page pageid="7819" ns="0" title="Start Counter Simulations" contentmodel="wikitext" pagelanguage="en" touched="2015-04-01T09:23:29Z" lastrevid="65657" counter="8908" length="5888" />
      <page pageid="19772" ns="0" title="Training and Safety SRC" contentmodel="wikitext" pagelanguage="en" touched="2021-09-28T16:00:29Z" lastrevid="107148" counter="620" length="2703" />
      <page pageid="22482" ns="0" title="Wiki examples" contentmodel="wikitext" pagelanguage="en" touched="2024-02-16T02:00:16Z" lastrevid="124730" counter="172" length="2273" />
    </pages>
  </query>
</api>