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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <div class="example"> <p class="child">P element with class="child" in first div with class="example". P's index is 0, and Div's index is 0.</p> </div> <div class="example"> <p class="child color">First P element with class="child" and "color" in second div with class="example". P's index is 0, and Div's index is 1.</p> <p class="child color">Second P element with class="child" and "color" in second div with class="example". P's index is 1, and Div's index is 1.</p> </div> <div class="example"> <p class="child color">First P element with class="child" and "color" in third div with class="example". P's index is 0, and Div's index is 2.</p> <p class="child color">Second P element with class="child" and "color" in third div with class="example". P's index is 1, and Div's index is 2.</p> </div> <p>Click the button to change the background color of the first p element with classes "child" and "color" inside the second div element with class="example".</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.getElementsByClassName("example")[1]; x.getElementsByClassName("child color")[0].style.backgroundColor = "red"; } </script> </body> </html>