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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelectorAll() Method</h2> <p>Add a background color to the first p element with class="example":</p> <h2 class="example">A heading</h2> <p class="example">A paragraph.</p> <p class="example">A paragraph.</p> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>