<!DOCTYPE html>
<html>
<body>
<p>Click the button to display a blinking string (Only supported in Opera 12 and earlier versions. Not supported in Opera 15+, IE, Firefox, Chrome, or Safari).</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "Hello World!";
var result = str.blink();
document.getElementById("demo").innerHTML = result;
}
</script>
</body>
</html>