<!doctype HTML> <html> <meta charset="utf8"> <title>Content Visibility: hidden iframe, size changes (reference)</title> <link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org"> <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> <p>Test fails if the box below is square.</p> <iframe width=200 height=300></iframe> </html>