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="20130220174803|20" />
  </query-continue>
  <query>
    <blocks>
      <block id="39" user="188.163.99.210" by="Марина Тумовская" timestamp="2017-04-30T18:09:31Z" expiry="infinity" reason="Спам-ссылки на внешние сайты" nocreate="" noemail="" />
      <block id="37" user="Nickisgeek" by="Марина Тумовская" timestamp="2017-03-22T18:09:52Z" expiry="infinity" reason="" nocreate="" autoblock="" noemail="" />
      <block id="36" user="92.60.189.153" by="Марина Тумовская" timestamp="2016-05-18T19:26:27Z" expiry="infinity" reason="вандализм" anononly="" nocreate="" />
      <block id="35" user="62.212.73.246" by="Марина Тумовская" timestamp="2016-05-17T19:15:19Z" expiry="infinity" reason="вандализм" nocreate="" />
      <block id="34" user="138.201.88.84" by="Марина Тумовская" timestamp="2016-05-17T13:00:29Z" expiry="infinity" reason="вандализм" anononly="" nocreate="" />
      <block id="33" user="37.79.83.208" by="Марина Тумовская" timestamp="2014-11-06T14:22:38Z" expiry="infinity" reason="вандализм" anononly="" nocreate="" />
      <block id="31" user="Cotton 45" by="Марина Тумовская" timestamp="2014-10-29T10:09:17Z" expiry="infinity" reason="Спам-ссылки на внешние сайты" nocreate="" autoblock="" />
      <block id="30" user="SoilahzqhvxmeykHey" by="WikiSysop" timestamp="2013-06-03T00:18:16Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="23" user="VanlfJ98" by="Марина Тумовская" timestamp="2013-02-20T17:48:23Z" expiry="infinity" reason="Спам-ссылки на внешние сайты" nocreate="" autoblock="" />
      <block id="22" user="HamrickFike380" by="Марина Тумовская" timestamp="2013-02-20T17:48:11Z" expiry="infinity" reason="Спам-ссылки на внешние сайты" nocreate="" autoblock="" />
    </blocks>
  </query>
</api>