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<!DOCTYPE html> <html> <body> <div class="example"> A div element with class="example" </div> <div class="example"> Another div element with class="example" </div> <p>A p element with class="example"</p> <p>Click the button to find out how many elements with class "example" there are in this document.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The getElementsByClassName() method is not supported in Internet Explorer 8 and earlier versions.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByClassName("example"); document.getElementById("demo").innerHTML = x.length; } </script> </body> </html>