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<!DOCTYPE html>
<html>
<body>

<h3>A demonstration of how to access a P element</h3>

<p id="myP">I am a paragraph. Click the button to get my id.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("myP").id;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>