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="Universe:_Teamwork" />
  </query-continue>
  <query>
    <pages>
      <page pageid="84" ns="0" title="Clones/Variants" />
      <page pageid="90" ns="0" title="Inherent Ability" />
      <page pageid="653" ns="0" title="Inherent ability" />
      <page pageid="85" ns="0" title="Location Cards" />
      <page pageid="626" ns="0" title="Marvels OverPower" />
      <page pageid="786" ns="0" title="OverPower Toronto&#039;s Unofficial Marvels OverPower Expansion" />
      <page pageid="893" ns="0" title="Peace Bridge Tournament 2013" />
      <page pageid="79" ns="0" title="Tactic: Artifact" />
      <page pageid="78" ns="0" title="Tactic: Doubleshot" />
      <page pageid="77" ns="0" title="Universe: Ally" />
    </pages>
  </query>
</api>