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="30" user="You can&#039;t stop the trolls" by="Neo21670" timestamp="2015-06-10T07:46:12Z" expiry="infinity" reason="" nocreate="" allowusertalk="" />
      <block id="26" user="Anonymous" by="Desolate" timestamp="2015-01-11T15:51:46Z" expiry="infinity" reason="Spammelgetés, reklámlinkek tömködése a lapokba" nocreate="" autoblock="" noemail="" />
      <block id="22" user="Uxarrs" by="Neo21670" timestamp="2013-01-29T15:51:12Z" expiry="infinity" reason="Elfogadhatatlan azonosító" nocreate="" autoblock="" allowusertalk="" />
      <block id="21" user="184.22.56.105" by="Neo21670" timestamp="2013-01-28T12:05:11Z" expiry="infinity" reason="Spammelgetés, reklámlinkek tömködése a lapokba" anononly="" allowusertalk="" />
      <block id="18" user="Ipodsoft" by="Neo21670" timestamp="2012-12-09T23:16:34Z" expiry="infinity" reason="Spammelgetés, reklámlinkek tömködése a lapokba" nocreate="" autoblock="" />
      <block id="11" user="Yarmsantplsv" by="GreenReaper" timestamp="2012-09-08T17:42:38Z" expiry="infinity" reason="Spammelgetés, reklámlinkek tömködése a lapokba" nocreate="" autoblock="" noemail="" />
      <block id="4" user="Yinepu2" by="Neo21670" timestamp="2010-02-23T23:08:31Z" expiry="infinity" reason="Értelmetlen megjegyzések, halandzsa beillesztése a cikkekbe" nocreate="" autoblock="" />
      <block id="3" user="Yinepu" by="Neo21670" timestamp="2009-12-14T18:49:04Z" expiry="infinity" reason="Lapok tartalmának eltávolítása" nocreate="" />
    </blocks>
  </query>
</api>