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<!DOCTYPE html> <html> <body> <p>This is a p element.</p> <p>This is also a p element.</p> <p>Click the button to add a background color to the first p element (index 0) 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"); x[0].style.backgroundColor = "red"; } </script> </body> </html>