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>
    <logevents lestart="2017-05-23T20:21:04Z" />
  </query-continue>
  <query>
    <logevents>
      <item logid="796" ns="8" title="MediaWiki:Sitenotice" pageid="5" type="patrol" action="patrol" user="Brona" timestamp="2018-02-20T08:58:43Z" comment="">
        <patrol cur="739" prev="728" auto="1" />
      </item>
      <item logid="795" ns="0" title="Prioritné rady" pageid="52" type="patrol" action="patrol" user="Brona" timestamp="2017-06-30T11:20:25Z" comment="">
        <patrol cur="738" prev="737" auto="1" />
      </item>
      <item logid="794" ns="6" title="Súbor:Fheap-example.png" pageid="109" type="upload" action="upload" img_sha1="4yiow25d9h3as8p8mtwhy34kq9vjj2h" img_timestamp="2017-06-28T07:27:57Z" user="Brona" timestamp="2017-06-28T07:27:57Z" comment="" />
      <item logid="793" ns="2" title="Redaktor:Becza1" pageid="0" type="newusers" action="create2" userid="12" user="Brona" timestamp="2017-06-28T07:23:55Z" comment="" />
      <item logid="792" ns="6" title="Súbor:Web-all.pdf" pageid="90" type="upload" action="overwrite" img_sha1="q85tc4twap0qbowevhwut02qzamc3o9" img_timestamp="2017-06-06T20:53:12Z" user="Brona" timestamp="2017-06-06T20:53:12Z" comment="" />
      <item logid="791" ns="8" title="MediaWiki:Sitenotice" pageid="5" type="patrol" action="patrol" user="Brona" timestamp="2017-05-24T11:23:59Z" comment="">
        <patrol cur="728" prev="709" auto="1" />
      </item>
      <item logid="790" ns="0" title="Úsporné dátové štruktúry" pageid="58" type="patrol" action="patrol" user="Brona" timestamp="2017-05-23T20:34:22Z" comment="">
        <patrol cur="727" prev="726" auto="1" />
      </item>
      <item logid="789" ns="0" title="Úsporné dátové štruktúry" pageid="58" type="patrol" action="patrol" user="Brona" timestamp="2017-05-23T20:33:58Z" comment="">
        <patrol cur="726" prev="725" auto="1" />
      </item>
      <item logid="788" ns="0" title="Úsporné dátové štruktúry" pageid="58" type="patrol" action="patrol" user="Brona" timestamp="2017-05-23T20:33:09Z" comment="">
        <patrol cur="725" prev="596" auto="1" />
      </item>
      <item logid="787" ns="0" title="Nepovinná DÚ" pageid="94" type="patrol" action="patrol" user="Brona" timestamp="2017-05-23T20:23:15Z" comment="">
        <patrol cur="724" prev="723" auto="1" />
      </item>
    </logevents>
  </query>
</api>