de.t</a></code><code><span class="keyword"> constraint </span><span class="type-var">'a</span> = [&gt; Html_Node.thead ]</code></dt><dt class="spec type" id="type-child"><a href="#type-child" class="anchor"></a><code><span class="keyword">type </span>+'a child</code><code><span class="keyword"> = </span>[ <a href="../../Html_Node#type-tr">Html_Node.tr</a><span class="keyword"> | </span><a href="../../Html_Node/ContentCategory/Element#type-script_supporting">Html_Node.Element.script_supporting</a><span class