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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 the first p element in the document where the parent is a div element.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.querySelector("div > p"); x.style.backgroundColor = "red"; } </script> </body> </html>
