chromium/chrome/test/data/content_setting_bubble/mixed_script_in_cross_site_iframe.html

<!DOCTYPE html>
<html>
<head>
<title>Mixed content in cross-site iframe test</title>
</head>
<body>
<script>
// The test using this document supplies the URL for an iframe to be created
// as a query parameter. The following piece of code creates an iframe with
// the supplied URL and adds it to the DOM.
var f = document.createElement('iframe');
f.src = location.search.substring(1);
document.body.appendChild(f);
</script>
</body>
</html>