JSFiddle - React, Tailwind, and code Playground

HTML

editor:<p>
<div id="myDiv1"contenteditable="true"></div>
<p>
textarea:<p>
<textarea id="myTextarea" ></textarea>

<input type="button" id="btn" name="btn" value="go">

CSS

#myDiv1{
    width:400px;
    height:50px;
    border:solid 1px #000;
}
#myTextarea{
    width:400px;
    height:50px;
    border:solid 1px #000;
}

JavaScript

$("#btn").click(function (){
    $("#myTextarea").val($("#myDiv1").text());
});