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>
    <pageswithprop gpwpcontinue="459" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Hauptseite" touched="2019-01-12T23:45:08Z" lastrevid="63001" counter="592297" length="4606" />
      <page pageid="42" ns="274" title="Widget:Google Maps" touched="2018-10-23T12:25:28Z" lastrevid="54132" counter="405" length="4219" />
      <page pageid="122" ns="274" title="Widget:Google Document" touched="2018-10-23T12:27:37Z" lastrevid="54138" counter="381" length="2042" />
      <page pageid="123" ns="274" title="Widget:Twitter" touched="2014-01-08T18:13:22Z" lastrevid="4591" counter="1061" length="1205" />
      <page pageid="130" ns="12" title="Hilfe:Layout" touched="2014-02-08T21:36:13Z" lastrevid="5156" counter="3159" length="2177" />
      <page pageid="134" ns="12" title="Hilfe:Schulstartseite" touched="2019-09-01T09:31:01Z" lastrevid="59850" counter="25231" length="3300" />
      <page pageid="136" ns="12" title="Hilfe:Hinweise für Lehrer" touched="2020-04-19T16:49:04Z" lastrevid="85311" counter="135442" length="7290" />
      <page pageid="148" ns="10" title="Vorlage:Schulstartseite blau" touched="2019-09-01T09:31:01Z" lastrevid="72507" counter="1263" length="813" />
      <page pageid="153" ns="0" title="Ideenpool" touched="2018-05-02T19:41:57Z" lastrevid="44195" counter="45981" length="11324" />
      <page pageid="180" ns="0" title="Wiki, Web 2.0 und Schlüsseltrends" touched="2018-05-02T13:53:59Z" lastrevid="44032" counter="22409" length="5564" />
    </pages>
  </query>
</api>