JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="Parent"></ul>

CSS

li { background:#ccc; }

JavaScript

var Parent = document.getElementById('Parent');

// your code

var newLi =document.createElement("li");
var newLable=document.createElement("label");
newLable.className="labletext";
newLable.contentEditable="true";
newLable.innerText=String(localStorage["task."+0+".taskValue"]);
newLable.addEventListener('blur',editTask,false);
newLi.appendChild(newLable);
Parent.appendChild(newLi);

function editTask()
{
   var keyid=this.id;
   var startchar = keyid.lastIndexOf("_");
   var endchar=keyid.length;        
   var taskId=parseInt(keyid.substring(startchar+1,endchar));

   localStorage.setItem("task."+taskId+".taskValue",this.innerText);
   loadTasks("tasklist");
}