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 bkstart="2014-06-02T16:24:27Z" />
  </query-continue>
  <query>
    <blocks>
      <block id="153" user="Ron squire" by="William ponissi" timestamp="2014-09-10T15:05:22Z" expiry="infinity" reason="Inserting nonsense/gibberish into pages" nocreate="" autoblock="" />
      <block id="152" user="Harley hamnett" by="William ponissi" timestamp="2014-08-20T22:17:40Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="148" user="23.105.212.27" by="Chris williamson" timestamp="2014-06-02T19:25:02Z" expiry="infinity" reason="Spamming links to external sites" anononly="" nocreate="" />
      <block id="146" user="FrancisT00" by="William ponissi" timestamp="2014-06-02T16:25:08Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="144" user="ElizbetWynne" by="William ponissi" timestamp="2014-06-02T16:25:02Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="142" user="EpifaniDipietro" by="William ponissi" timestamp="2014-06-02T16:24:55Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="140" user="RodolfoClowers" by="William ponissi" timestamp="2014-06-02T16:24:50Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="138" user="AlmedaDougharty" by="William ponissi" timestamp="2014-06-02T16:24:45Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="136" user="KianMnyxraiy" by="William ponissi" timestamp="2014-06-02T16:24:38Z" expiry="infinity" reason="" nocreate="" autoblock="" />
      <block id="134" user="DonetteFlorance" by="William ponissi" timestamp="2014-06-02T16:24:33Z" expiry="infinity" reason="" nocreate="" autoblock="" />
    </blocks>
  </query>
</api>