js clear child nodes
<script>
function removeAllChildNodes(parent) {
while (parent.firstChild) {
parent.removeChild(parent.firstChild);
}
}
const container = document.getElementById('container');
removeAllChildNodes(container);
</script>
<div id="container">
<p>All elements inside this container will be deleted,</p>
<p>when removeAllChildNodes(container) is run.</p>
</div>