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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="Living_people" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1976 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">American country singer-songwriters</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">American country singers</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">American male singer-songwriters</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">American male singers</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Articles which use infobox templates with no data rows</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Country musicians from California</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Country musicians from Tennessee</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Country rap musicians</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Elektra Records artists</c>
</allcategories>
</query>
</api>