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<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>const nodeList = document.querySelectorAll(".example");document.getElementById("demo").innerHTML = nodeList.length;</script></body></html>