<html>
<body>
<p>Click the button to return the value of its value attribute.</p>
<button id="myBtn" value="myvalue" onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myBtn").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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</html>