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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <div id="myDIV"> <p class="child">First p element with class="child" in a div (index 0).</p> <p class="child">Second p element with class="child" in a div (index 1).</p> <p class="child">Third p element with class="child" in a div (index 2).</p> </div> <p>Click the button to add a background color to the second p element with class="child" inside the div element.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The getElementsByClassName() method is not supported in Internet Explorer 8 and earlier versions.</p> <script> function myFunction() { var x = document.getElementById("myDIV"); x.getElementsByClassName("child")[1].style.backgroundColor = "red"; } </script> </body> </html>