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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="Evénement_MadaREN" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Article en travaux</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Categorie 01</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Categorie 02</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Catégorie-01</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Catégorie 01</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Editor handbook</c>
<c size="2" pages="1" files="0" subcats="1" xml:space="preserve">Evénement</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Evénement Archive</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Evénement Intervention</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Evénement MADAREN</c>
</allcategories>
</query>
</api>