<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS Test: :focus-within selector</title> <link rel="author" title="Ethan Lin" href="mailto:ethlin@mozilla.com"> <link rel="author" title="Mozilla" href="https://www.mozilla.org"> </head> <body> <p>Test passes if, when the element inside the iframe is focused, there is no red border surrounded.</p> <div> <iframe src="focus-within-1.html" width="300px" height="300px" frameborder="0" tabindex="1"><p>Your browser does not support iframes.</p></iframe> </div> </body> </html>