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="20230921133849|19727" />
  </query-continue>
  <query>
    <blocks>
      <block id="19740" user="172.26.16.37" by="Hoof Hearted" timestamp="2024-05-19T12:05:55Z" expiry="2024-11-19T12:05:55Z" reason="Spammer" anononly="" nocreate="" />
      <block id="19739" user="Terilir" by="MarkDilley" timestamp="2024-05-13T14:45:58Z" expiry="infinity" reason="Sockpuppet" nocreate="" autoblock="" />
      <block id="19737" user="Usa11" by="MarkDilley" timestamp="2024-05-13T13:45:53Z" expiry="infinity" reason="Sockpuppet" nocreate="" autoblock="" />
      <block id="19736" user="115.75.212.35" by="Hoof Hearted" timestamp="2023-12-07T18:06:15Z" expiry="infinity" reason="Spammer: spammer trying to create multiple new accounts - bio was very clearly spam!" anononly="" nocreate="" noemail="" />
      <block id="19734" user="115.75.214.135" by="Hoof Hearted" timestamp="2023-12-07T18:00:11Z" expiry="infinity" reason="Spammer: Spammer trying to create multiple new accounts - bio was very clearly spam!" anononly="" nocreate="" noemail="" />
      <block id="19733" user="152.58.129.103" by="Hoof Hearted" timestamp="2023-12-04T11:49:08Z" expiry="2024-12-04T11:49:08Z" reason="Spammer: Spammer trying to create new account - bio was very clearly spam!" anononly="" nocreate="" noemail="" />
      <block id="19731" user="88.236.99.46" by="Hoof Hearted" timestamp="2023-11-12T10:14:20Z" expiry="2024-11-12T10:14:20Z" reason="Spammer: Spamming betting sites in Turkish" anononly="" nocreate="" noemail="" />
      <block id="19730" user="101.2.167.130" by="Hoof Hearted" timestamp="2023-11-10T11:36:10Z" expiry="2024-11-10T11:36:10Z" reason="Spammer: Trying to create account used for spamming" anononly="" nocreate="" noemail="" />
      <block id="19729" user="172.26.10.229" by="Hoof Hearted" timestamp="2023-11-10T11:31:03Z" expiry="2024-11-10T11:31:03Z" reason="Spammer" anononly="" />
      <block id="19728" user="86.98.48.206" by="Hoof Hearted" timestamp="2023-10-10T10:50:45Z" expiry="2024-10-10T10:50:45Z" reason="Spammer: Spammer for Nissan Motor Egypt" anononly="" nocreate="" />
    </blocks>
  </query>
</api>