JSFiddle - React, Tailwind, and code Playground

HTML

<button>backSpace</button>
        <div id = "mainDiv" contenteditable="true">asd</div>

JavaScript

function backSpace()
{
    var txt = $("#mainDiv").text();
    txt = txt.substr(0,txt.length-1)
    $("#mainDiv").text(txt);
}

$(document).ready(function(){
	$('button').click(backSpace);
});