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<!DOCTYPE html> <html> <head> <style> .example { border: 1px solid black; margin: 5px; } </style> </head> <body> <h1>A h1 element</h1> <div>A div element</div> <p>A p element.</p> <p>Another p element.</p> <div class="example"> <p>A p element inside a div element.</p> </div> <p>Click the button to change the background color of all p elements in the document.</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("p"); var i; for (i = 0; i < x.length; i++) { x[i].style.backgroundColor = "red"; } } </script> </body> </html>