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>
    <allimages aicontinue="20170721170748|Vacation3.PNG" />
  </query-continue>
  <query>
    <allimages>
      <img name="Windows_mail_7_2022-03-08.jpg" timestamp="2022-03-08T19:31:18Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/4/43/Windows_mail_7_2022-03-08.jpg" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Windows_mail_7_2022-03-08.jpg" ns="6" title="File:Windows mail 7 2022-03-08.jpg" />
      <img name="Windows_mail_3_2022-03-08.jpg" timestamp="2022-03-08T19:30:15Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/b/b9/Windows_mail_3_2022-03-08.jpg" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Windows_mail_3_2022-03-08.jpg" ns="6" title="File:Windows mail 3 2022-03-08.jpg" />
      <img name="Outlook07_06_2022-03-08.png" timestamp="2022-03-08T19:28:59Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/d/d3/Outlook07_06_2022-03-08.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Outlook07_06_2022-03-08.png" ns="6" title="File:Outlook07 06 2022-03-08.png" />
      <img name="Outlook07_04_2022-03-08.png" timestamp="2022-03-08T19:27:27Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/f/f7/Outlook07_04_2022-03-08.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Outlook07_04_2022-03-08.png" ns="6" title="File:Outlook07 04 2022-03-08.png" />
      <img name="Outlook_step6_2022-03-08.png" timestamp="2022-03-08T19:26:00Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/0/01/Outlook_step6_2022-03-08.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Outlook_step6_2022-03-08.png" ns="6" title="File:Outlook step6 2022-03-08.png" />
      <img name="Outlook_step3_IMAP.png" timestamp="2022-03-08T19:24:16Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/a/ae/Outlook_step3_IMAP.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Outlook_step3_IMAP.png" ns="6" title="File:Outlook step3 IMAP.png" />
      <img name="Outlook_step3.png" timestamp="2022-03-08T19:23:34Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/b/bd/Outlook_step3.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Outlook_step3.png" ns="6" title="File:Outlook step3.png" />
      <img name="Webmail-passchange.png" timestamp="2022-02-18T20:13:02Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/d/d5/Webmail-passchange.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Webmail-passchange.png" ns="6" title="File:Webmail-passchange.png" />
      <img name="Webmail-login.png" timestamp="2022-02-18T20:12:19Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/8/89/Webmail-login.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:Webmail-login.png" ns="6" title="File:Webmail-login.png" />
      <img name="BloodyMaryPsyduck_(1).png" timestamp="2022-02-18T19:25:13Z" user="Wiki admin" url="https://wiki.supranet.net/wiki/images/5/5e/BloodyMaryPsyduck_%281%29.png" descriptionurl="https://wiki.supranet.net/wiki/index.php/File:BloodyMaryPsyduck_(1).png" ns="6" title="File:BloodyMaryPsyduck (1).png" />
    </allimages>
  </query>
</api>