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>
    <blocks>
      <block id="10" user="Anton Starostin" by="Admin" timestamp="2021-11-19T09:41:13Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="8" user="Andrey Krasov" by="Admin" timestamp="2021-11-19T09:40:50Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="7" user="Mihail Artemiev" by="Admin" timestamp="2019-09-28T07:44:58Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="6" user="Karadius" by="Admin" timestamp="2019-09-28T07:44:50Z" expiry="infinity" reason="" nocreate="" autoblock="" noemail="" />
      <block id="5" user="Elena Sapunova" by="Admin" timestamp="2019-09-28T07:44:24Z" expiry="infinity" reason="" nocreate="" autoblock="" noemail="" />
      <block id="4" user="Oleg Belousov" by="Admin" timestamp="2019-09-28T07:43:57Z" expiry="infinity" reason="" nocreate="" autoblock="" noemail="" />
      <block id="3" user="P.pukach" by="Admin" timestamp="2019-03-27T06:54:47Z" expiry="infinity" reason="Вставка ложной информации" nocreate="" autoblock="" />
      <block id="2" user="Sergey Shulgin" by="Admin" timestamp="2018-06-28T08:27:13Z" expiry="infinity" reason="Неприемлемое имя участника" nocreate="" noemail="" />
    </blocks>
  </query>
</api>