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="Grapple|41" />
  </query-continue>
  <query>
    <pages>
      <page pageid="21" ns="0" title="Critical Chance" />
      <page pageid="22" ns="0" title="Critical Damage Modifier" />
      <page pageid="24" ns="0" title="Damage Modifier" />
      <page pageid="25" ns="0" title="Damage Range" />
      <page pageid="26" ns="0" title="Damage Reduction" />
      <page pageid="27" ns="0" title="Damage Vulnerability" />
      <page pageid="30" ns="0" title="Grapple Chance" />
      <page pageid="40" ns="0" title="Critical Resist" />
      <page pageid="53" ns="0" title="Level" />
      <page pageid="58" ns="0" title="Critical Damage" />
    </pages>
  </query>
</api>