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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.
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<?xml version="1.0"?>
<api>
<query-continue>
<allcategories accontinue="Boss" />
</query-continue>
<query>
<allcategories>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">Affrontement Kataclysmique</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Area images</c>
<c size="7" pages="7" files="0" subcats="0" xml:space="preserve">Armor</c>
<c size="6" pages="6" files="0" subcats="0" xml:space="preserve">Armor aura attachment</c>
<c size="6" pages="6" files="0" subcats="0" xml:space="preserve">Armor back attachment</c>
<c size="6" pages="6" files="0" subcats="0" xml:space="preserve">Armor front attachment</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Armor rear attachment</c>
<c size="6" pages="6" files="0" subcats="0" xml:space="preserve">Arsenal items</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Articles needing work</c>
<c size="3" pages="3" files="0" subcats="0" xml:space="preserve">Bombs</c>
</allcategories>
</query>
</api>