<!DOCTYPE html>
<html lang="en-US">
<body>
<p><abbr>WWE</abbr> is awesome.</p>
<p>Click on the button to add title to the abbr for WWE.</p>
<button onclick="myFunction()">Click Me</button>
<p><strong>Note</strong>: After clicking on the button, hover WWE.</p>
<script>
var elem = document.getElementsByTagName("abbr")[0];
function myFunction(){
elem.title = "World Wrestling Entertainment";
}
</script> </body>
</html>