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<html><body><p>The first p element in the document.</p><p>Another p element.</p><p>Click the button to find out how many p elements there are in this document.</p><button onclick="myFunction()">Try it</button><p id="demo">I am also a p element.</p><script>function myFunction() { var nodelist = document.getElementsByTagName("P").length; document.getElementById("demo").innerHTML = nodelist;}</script></body></html>