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>
    <alllinks galcontinue="Backtraces|912" />
  </query-continue>
  <query>
    <pages>
      <page pageid="5" ns="0" title="Main Page" />
      <page pageid="659" ns="0" title="FAQ utils" />
      <page pageid="723" ns="0" title="AMule devs" />
      <page pageid="797" ns="0" title="Using another wxinstall" />
      <page pageid="909" ns="0" title="Main Page-es" />
      <page pageid="910" ns="0" title="FAQ utils-es" />
      <page pageid="1472" ns="0" title="UNIX" />
      <page pageid="5392" ns="0" title="GTK" />
      <page pageid="21842" ns="8" title="MediaWiki:Mario Kart Tour Cheats For Android And Ios:Innumerous" />
      <page pageid="21948" ns="8" title="MediaWiki:Pokemon Go Generator For Android And Ios:Installed Method" />
    </pages>
  </query>
</api>