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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelectorAll() Method</h2> <div class="example"> A div element with class="example" </div> <div class="example"> A div element with class="example" </div> <p class="example">A p element with class="example"</p> <p>How many elements with class "example" in this document:</p> <p id="demo"></p> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>