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>
    <allredirects garcontinue="II_-_Narodziny_BiuĊ›ciastego_Cesarskiego_Smoka|2493" />
  </query-continue>
  <query>
    <pages>
      <page pageid="201" ns="0" title="Boosted Gear" />
      <page pageid="2414" ns="0" title="Bennia" />
      <page pageid="2494" ns="0" title="Bohaterski Oppai Smok" />
      <page pageid="2733" ns="0" title="High School DxD Born" />
      <page pageid="3365" ns="0" title="High School DxD DX.1" />
      <page pageid="3693" ns="0" title="High School DxD New" />
      <page pageid="3704" ns="0" title="High School DxD DX.2" />
      <page pageid="3719" ns="0" title="High School DxD DX.3" />
      <page pageid="4962" ns="0" title="High School DxD DX.4" />
      <page pageid="7691" ns="0" title="High School DxD Hero" />
    </pages>
  </query>
</api>