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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelectorAll() Method</h2> <p>Set the background color of all h3 and span elements:</p> <h1>A H1 element</h1> <h2>A H2 element</h2> <h3>A H3 element</h3> <p>A p element.</p> <p>A p element with a span element.</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>