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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="関数" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">4</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">V3</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">v3</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">ver4</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">その他</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">サンプル</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">ローカル環境構築</c>
<c size="13" pages="13" files="0" subcats="0" xml:space="preserve">利用ガイド</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">壊れたファイルへのリンクがあるページ</c>
<c size="14" pages="12" files="0" subcats="2" xml:space="preserve">開発ガイド</c>
</allcategories>
</query>
</api>