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>
    <allpages apcontinue="Excel_2013:Minimize_the_Ribbon" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="2237" ns="0" title="BlackBerry Leap: Taking a Screenshot" />
      <p pageid="1425" ns="0" title="Change or Delete iPhone Signature: Sent from my iPhone" />
      <p pageid="1426" ns="0" title="Change or Delete iPhone signature: Send from my iPhone" />
      <p pageid="386" ns="0" title="Chromebook: Taking Screenshot" />
      <p pageid="1136" ns="0" title="Delete My WhatsApp Account on Windows Phone" />
      <p pageid="14" ns="0" title="Delete or Edit Messages in Skype for Windows 8" />
      <p pageid="2278" ns="0" title="Edge Browser: Full Shortcut List" />
      <p pageid="2134" ns="0" title="Excel: Switch Between Workbooks - All Solutions" />
      <p pageid="565" ns="0" title="Excel 2013:Format Cell" />
      <p pageid="571" ns="0" title="Excel 2013:Format cell borders" />
    </allpages>
  </query>
</api>