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>
    <allpages apcontinue="Certificate_Services_General_Notes" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1482" ns="0" title="Backtrace HowTo" />
      <p pageid="1635" ns="0" title="Backup Configs to TFTP" />
      <p pageid="2046" ns="0" title="BashRC Reload" />
      <p pageid="1510" ns="0" title="Batch Files" />
      <p pageid="2028" ns="0" title="Bitlocker Recovery Boot Loop" />
      <p pageid="2084" ns="0" title="Bitwarden" />
      <p pageid="1616" ns="0" title="Block Youtube" />
      <p pageid="1498" ns="0" title="Bounce Size Limit" />
      <p pageid="1968" ns="0" title="CHM Blank" />
      <p pageid="2072" ns="0" title="CLI Quick Reference - OpenWRT" />
    </allpages>
  </query>
</api>