Click the buttons to add elements to the page.
function doIt() {
var newDiv = document.createElement("div");
newDiv.innerHTML = "This is a DIV";
newDiv.className = "class1";
document.body.appendChild(newDiv);
var btn = document.createElement("button");
btn.innerHTML = "I'm a Button";
document.body.appendChild(document.createElement('br'));
document.body.appendChild(btn);
}