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>
    <blocks bkcontinue="20150103010255|39955" />
  </query-continue>
  <query>
    <blocks>
      <block id="39998" user="198.96.95.173" by="Jpolzfuss" timestamp="2021-04-30T16:45:22Z" expiry="infinity" reason="Spamming links to external sites: Blocked for replacing links to a 1.55x anamorphic with a link to a 1.33x anamorphic" anononly="" nocreate="" />
      <block id="39997" user="185.220.102.8" by="Jpolzfuss" timestamp="2019-06-05T12:40:41Z" expiry="infinity" reason="Inserting nonsense/gibberish into pages" nocreate="" />
      <block id="39996" user="70.119.41.67" by="Jpolzfuss" timestamp="2015-11-23T18:12:03Z" expiry="infinity" reason="Spamming links to external sites: just another spam-bot :-(" nocreate="" />
      <block id="39995" user="ClaireMarch" by="Jpolzfuss" timestamp="2015-01-05T06:37:36Z" expiry="infinity" reason="Spamming links to external sites: Spam-bot:-(" nocreate="" autoblock="" />
      <block id="39967" user="BerniceBegin" by="Jpolzfuss" timestamp="2015-01-03T01:19:57Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
      <block id="39965" user="JoycelyBja" by="Jpolzfuss" timestamp="2015-01-03T01:16:18Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
      <block id="39963" user="Beryl0638ium" by="Jpolzfuss" timestamp="2015-01-03T01:15:19Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
      <block id="39961" user="India3978cuijqc" by="Jpolzfuss" timestamp="2015-01-03T01:05:54Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
      <block id="39959" user="DianU10tcjd" by="Jpolzfuss" timestamp="2015-01-03T01:04:35Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
      <block id="39957" user="KentNicolay" by="Jpolzfuss" timestamp="2015-01-03T01:03:12Z" expiry="infinity" reason="Spamming links to external sites: spam-bot" nocreate="" autoblock="" />
    </blocks>
  </query>
</api>