If we try to insert only closing tag of HTML element in the HTML page, The browser does not display the closing </u> because it is interpreted as an HTML closing tag, not as text.

<!DOCTYPE html>
 
<html lang="en">
 
<head>
 
    <meta charset="UTF-8">
 
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
    <title>Sample Document</title>
 
</head>
 
<body>
 
    <p>example</u></p>
 
</body>
 
</html>