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<!DOCTYPE html> <html> <style> .example { border: 1px solid black; margin: 5px; } </style> <body> <h1>The Document Object</h1> <h2>The querySelectorAll() Method</h2> <h3>Change the background color of all p elements:</h3> <h1>A h1 element</h1> <div>A div element</div> <p>A p element.</p> <p>A p element.</p> <div class="example"> <p>A p element inside a div element.</p> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>