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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelector() Method</h2> <p>Select the first h3 or the first h4:</p> <h3>A h3 element</h3> <h4>A h4 element</h4> <script> document.querySelector("h3, h4").style.backgroundColor = "red"; </script> </body> </html>
