<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
.point::before {
content: attr(href);
}
</style>
</head>
<body>
<h1>CSS content Property</h1>
<a href="https://wikimass.com/js">(Learn JavaScript)</a>
<button onclick="myFunction()">Click Me</button>
<script>
var x = document.getElementsByTagName("a")[0];
function myFunction(){
x.className += "point";
}
</script>
<p><strong>Note</strong>: Click on the button to add css 'content' property.</p> </body>
</html>