chromium/third_party/blink/web_tests/plugins/plugin-inside-iframe.html

<!doctype html>
<html>
<head>
</head>
<body>
<iframe frameborder="0" width="200" height="200" src="resources/plugin-page.html"></iframe>
<script>
    if (!window.testRunner) {
        document.write("This test does not work in manual mode.");
    } else {
        testRunner.dumpAsText();
    }
</script>
<div>This tests that we do not crash by putting a plugin inside an iframe.</div>
</body>
</html>