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>
    <pageswithprop gpwpcontinue="3397" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" contentmodel="wikitext" pagelanguage="en" touched="2023-06-08T09:55:16Z" lastrevid="16128" counter="302285" length="3215" />
      <page pageid="3350" ns="0" title=".30 Carbine" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:09Z" lastrevid="15887" counter="5931" length="4919" />
      <page pageid="3353" ns="0" title=".22 Long Rifle" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:49:45Z" lastrevid="15884" counter="4492" length="6192" />
      <page pageid="3361" ns="0" title=".260 Remington" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:49:56Z" lastrevid="15886" counter="2758" length="4110" />
      <page pageid="3363" ns="0" title=".300 AAC Blackout" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:12Z" lastrevid="15888" counter="3118" length="4446" />
      <page pageid="3368" ns="0" title=".300 Winchester Magnum" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:33Z" lastrevid="15890" counter="2680" length="4474" />
      <page pageid="3373" ns="0" title=".30-06 Springfield" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:47Z" lastrevid="15891" counter="3710" length="4944" />
      <page pageid="3378" ns="0" title=".38 Special" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:51:47Z" lastrevid="15902" counter="3596" length="6221" />
      <page pageid="3387" ns="0" title=".303 British" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:50Z" lastrevid="15892" counter="3128" length="4455" />
      <page pageid="3393" ns="0" title=".30-30 Winchester" contentmodel="wikitext" pagelanguage="en" touched="2023-02-13T17:50:53Z" lastrevid="15893" counter="3436" length="5083" />
    </pages>
  </query>
</api>