<!DOCTYPE html>
<html>
<body>
<form oninput="x.value=parseInt(a.value)+parseInt(b.value)">0
<input type="range" id="a" value="50">100
+<input type="number" id="b" value="50">
=<output id="myOutput" name="x" for="a b"></output>
</form>
<p>Click the button to display the value of the for attribute of the output element.</p>
<p><strong>Note:</strong> The output element is not supported in Internet Explorer.</p>
<button type="button" onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myOutput").htmlFor;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>