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