JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<div class="wrap3">
lorem lorem lorem
<div class="inside3 ed" contentEditable>ipsum ipsum ipsum</div>

</div>

<button id="btnsave">Save</button>

JavaScript

$("#btnsave").click(function(){
    var a = getSelectionStart();
    console.log(a);
});

function getSelectionStart() {
   var node = document.getSelection().anchorNode;
   console.log(node);
   return (node.nodeType == 3 ? node.parentNode : node);
}