ween each.</p></div></div><div class="spec val" id="val-vcat"><a href="#val-vcat" class="anchor"></a><div class="def val"><code><span class="keyword">val </span>vcat : <a href="index.html#type-t">t</a> list <span class="keyword">&#8209;&gt;</span> <a href="index.html#type-t">t</a></code></div><div class="doc"><p>Concatenate documents vertically.</p></div></div><div class="spec val" id="val-render"><a href="#val-render" class="anchor"></a><div class="def val"><code><span class="keyword">val </span>render : <