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<!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>