<!DOCTYPE html>
<html>
<body>
<p>Click the button to display the name of the button's first attribute.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the attributes property will return a collection of all possible attributes for the element, and will, in this example, display the name of a different attribute.</p>
<p id="demo"></p>
<script>
function myFunction() {
var btn = document.getElementsByTagName("BUTTON")[0];
var x = btn.attributes[0].name;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>