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 ns="0" title="Hamilton-Jacobi-Bellman-Isaacs equations in Hilbert spaces with applications in decision making under uncertainty --- Prof. Dr. A. N. Yannacopoulos" missing="" />
      <page ns="0" title="IFLA June 2020 Newsletter: The International Federation of Library Associations and Institutions --- Library Services to Multicultural Populations" missing="" />
      <page ns="0" title="Information Media and Migration - Channels, Content and Culture" missing="" />
      <page pageid="413" ns="0" title="CVXPY--- Convex Programming tools by Prof. Dr. Stephen Boyd" />
      <page pageid="412" ns="0" title="CVXPY --- Convex Programming tools by Prof. Dr. Stephen Boyd" />
      <page pageid="391" ns="0" title="FOSS4G UK Online 2020 Slides and Recordings now available from Open Source Geospatial Foundation’s UK Chapter OSGeo" />
      <page pageid="442" ns="0" title="HelpAge – COVID-19, Displacement &amp; Older People in Afghanistan - by Samuel Hall" />
      <page pageid="357" ns="0" title="Solving a Robust Capacitated Arc Routing Problem using a Hybrid Simulated Annealing Algorithm: A Waste Collection Application" />
    </pages>
  </query>
</api>