The append() and prepend() methods allow you to insert elements or text
at the end or the beginning of another element.
They provide a cleaner and more convenient alternative to appendChild().

element.append() — Add to the End

The append() method inserts content at the end of an element.
It can accept both DOM elements and text strings:

let container = document.getElementById('box');
let newDiv = document.createElement('div');
newDiv.textContent = 'New element';
container.append(newDiv, ' And this is just text');

element.prepend() — Add to the Beginning

The prepend() method inserts content at the beginning of an element:

let list = document.getElementById('myList');
let newItem = document.createElement('li');
newItem.textContent = 'New first item';
list.prepend(newItem);

append() and prepend() are clean and modern methods for inserting content into the DOM. They replace the older appendChild() approach, offer shorter syntax, and allow you to insert multiple nodes or text at once.