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>
    <allfileusages afcontinue="Imbox_notice.png|100" />
  </query-continue>
  <query>
    <allfileusages>
      <f fromid="636" ns="6" title="File:CNA students(4th) with instructors.jpeg" />
      <f fromid="211" ns="6" title="File:Disambig gray.svg" />
      <f fromid="77" ns="6" title="File:District 49 Flat-Color.png" />
      <f fromid="716" ns="6" title="File:District 49 Flat-Color.png" />
      <f fromid="269" ns="6" title="File:Edit-clear.svg" />
      <f fromid="65" ns="6" title="File:Falcon High School logo.png" />
      <f fromid="1041" ns="6" title="File:Https://www.b17.ru/foto/uploaded/upl 1497214532 51758.jpg" />
      <f fromid="84" ns="6" title="File:Husky1.jpg" />
      <f fromid="168" ns="6" title="File:Icon tools.png" />
      <f fromid="300" ns="6" title="File:Icon tools.svg" />
    </allfileusages>
  </query>
</api>