Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<p>Click the button to change the background color of all child elements of body.</p>

<button onclick="myFunction()">Try it</button>

<h2>I am a h2 element</h2>

<div>I am a div element</div>
<span>I am a span element</span>

<script>
function myFunction() {
    var c = document.body.children;
    var i;
    for (i = 0; i < c.length; i++) {
        c[i].style.backgroundColor = "red";
    }
}
</script>

</body>
</html>