Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<h3>A demonstration of how to access an Input Button</h3>

<p>Click the button to get the text that is displayed on the button.</p>

<input type="button" id="myBtn" onclick="myFunction()" value="Try it">

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

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

</body>
</html>