<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width" /> <title>Clickjacking example</title> <style type="text/css" media="screen"> body{ width: 100vw; height: 100vh; } iframe{ border: 3px solid black; width: 80%; height: 80%; margin: 20px auto; display: block; } h1, p{ text-align: center; } </style> </head> <body> <h1>Clickjacking example</h1> <iframe src="URL"> </iframe> <p>If content is rendered above, the site is vulnerable to clickjacking</p> </body> </html>