<!DOCTYPE html>
<html>
<body>
<p>Click the button to check if this document has the feature HTML DOM 1.0</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var imp = document.implementation;
document.getElementById("demo").innerHTML = imp.hasFeature("HTML", "1.0");
}
</script>
</body>
</html>