<!DOCTYPE html>
<html>
<body>
<input type="button" value="OK">
<p>Click the button below to remove the type attribute of the input element above.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> When removing the type attribute of an input element, the element will be of type <em>text</em>, which is the default value.</p>
<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the removedNamedItem returns the attribute as it should, but it does not remove the attribute.</p>
<script>
function myFunction() {
var btn = document.getElementsByTagName("INPUT")[0];
btn.attributes.removeNamedItem("type");
}
</script>
</body>
</html>