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<!DOCTYPE html> <html> <head> <style> div { border: 1px solid black; margin: 5px; } </style> </head> <body> <div id="myDIV"> <p>First p element in div.</p> <p>Another p element in div.</p> <p>A third p element in div.</p> </div> <p>Click the button to change the background color of all p elements inside the div element.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var div = document.getElementById("myDIV"); var nodelist = div.getElementsByTagName("P"); var i; for (i = 0; i < nodelist.length; i++) { nodelist[i].style.backgroundColor = "red"; } } </script> </body> </html>