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HTML is good for debugging, but is unsuitable for application use.
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To see the non HTML representation of the XML format, set format=xml.
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<?xml version="1.0"?>
<api>
  <query-continue>
    <allcategories accontinue="13th_Place_Tributes" />
  </query-continue>
  <query>
    <allcategories>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">' .. cat .. '</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">' .. error category .. '</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">(th/st/nd) Hunger Games</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">10th Place Tribute</c>
      <c size="8" pages="8" files="0" subcats="0" xml:space="preserve">10th Place Tributes</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">10th place tributes</c>
      <c size="8" pages="8" files="0" subcats="0" xml:space="preserve">11th Place Tributes</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">11th place tributes</c>
      <c size="7" pages="7" files="0" subcats="0" xml:space="preserve">12th Place Tributes</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">12th place tributes</c>
    </allcategories>
  </query>
</api>