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<!DOCTYPE html> <html> <body> <div class="example">First div element with class="example".</div> <div class="example">Second div element with class="example".</div> <p>Click the button to add a yellow background color to the first div element with class="example" (index 0).</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { let x = document.getElementsByClassName("example"); x[0].style.backgroundColor = "yellow"; } </script> </body> </html>
