JSFiddle - React, Tailwind, and code Playground

HTML

<body onload="addText()">
 <div id="test" u="slides" style="width:200px;height:200px;">
       
</div>
        <span u="arrowleft" class="jssora02l"></span>

</body>

JavaScript

var appender=1;
function addText(){
    var parentDiv =document.getElementsByClassName('jssora02l');      
    var node=document.createElement("DIV");
    node.innerHtml = '<p> bla bla<p>';
     parentDiv.insertBefore(node);
    appender++;
 
}