how to append html elements in javascript code example

Example 1: create and append element in javascript

//create and append element
 var node = document.createElement("LI");                 // Create a <li> node

 var textnode = document.createTextNode("Water");         // Create a text node

 node.appendChild(textnode);                              // Append the text to <li>

 document.getElementById("myList").appendChild(node);

Example 2: JavaScript append HTML

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

console.log(app.textContent);