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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelector() Method</h2> <p>Add a background color to the first element with class="example":</p> <p class="example">I am a paragraph.</p> <p class="example">I am a paragraph.</p> <script> document.querySelector(".example").style.backgroundColor = "red"; </script> </body> </html>
