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>
    <pages>
      <page pageid="354" ns="0" title="Information Media and Migration – Channels, Content and Culture" />
      <page pageid="358" ns="0" title="Solving a Robust Capacitated Arc Routing Problem using a Hybrid Simulated Annealing Algorithm: A waste Collection Application" />
      <page pageid="388" ns="0" title="IFLA June 2020 Newsletter" />
      <page pageid="390" ns="0" title="FOSS4G UK Online 2020 Slides and Recordings now available" />
      <page pageid="411" ns="0" title="CVXPY" />
      <page pageid="412" ns="0" title="CVXPY --- Convex Programming tools by Prof. Dr. Stephen Boyd" />
      <page pageid="419" ns="0" title="Hamilton-Jacobi-Bellman-Isaacs equations in Hilbert spaces with applications in decision making under uncertainty --- Prof. Dr. A. N. Yannacopoulo" />
      <page pageid="451" ns="0" title="COVID-19, Displacement &amp; Older People in Afghanistan" />
    </pages>
  </query>
</api>