JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test" contenteditable="true"></div>

JavaScript

// add some text to the editable div including zero space characters

var string = 't' + '\u200B' +  '\u200B' +'est' + 'four zero width spaces start here ->' + '\u200B' + '\u200B'+ '\u200B'+ '\u200B' + '  [click here and use the arrow key or backspace to move over the text to the left]' ;

var textnode = document.createTextNode( string );

$( '#test' ).focus();
$( '#test' ).append( string );