how to append html in div in javascript code example

Example 1: JavaScript append HTML

let app = document.querySelector('#app');
app.append('append() Text Demo');

console.log(app.textContent);

Example 2: js append html in div after

//Use Jquery
//Include this in your <head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

// This over writes any existing data in the element
// To prevent you can just create a new div under your element

<yourElement>
	<div id='<your element id here>'>
		<!--Your Jquery will be rendered here--> 
	</div>
</yourElement>

$('#<your element id here>').html(data);