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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV"> <h2 class="example">A heading with class="example" in div</h2> <p class="example">A paragraph with class="example" in div.</p> </div> <p>Click the button to change the text of the first element with class="example" in div.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myDIV"); x.querySelector(".example").innerHTML = "Hello World!"; } </script> </body> </html>
