JSFiddle - React, Tailwind, and code Playground
HTML
<div id="div1">
<ul>
<li>one</li>
<li>two</li>
</ul>
</div>
<div id="div2"><ul><li>one</li><li>two</li></ul></div>JavaScript
for(i=1; i<3; i++){
parentObj=document.getElementById('div'+i);
ObjFirst= parentObj.firstChild;
console.log ( "premier enfant de div"+i+": "+ ObjFirst.nodeName+ "\n de type "+ObjFirst.nodeType);
}