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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin-bottom: 10px; } </style> </head> <body> <div> <h3>H3 element</h3> <p>I am a p element, my parent is a div element.</p> </div> <div> <h3>H3 element</h3> <p>I am a p element, my parent is also a div element.</p> </div> <p>Click the button to change the background color of every p element where the parent is a div element.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The querySelectorAll() method is not supported in Internet Explorer 8 and earlier versions.</p> <script> function myFunction() { var x = document.querySelectorAll("div > p"); var i; for (i = 0; i < x.length; i++) { x[i].style.backgroundColor = "red"; } } </script> </body> </html>