<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\021D4";
}
</style>
</head>
<body>
<p>Left Right Double Arrow using Hexa Decimal: ⇔</p>
<p>Left Right Double Arrow using HTML Code: ⇔</p>
<p>Left Right Double Arrow using HTML Entity: ⇔</p>
<p id="point">Left Right Double Arrow using CSS Entity: </p> </body>
</html>