active-subresource-in-iframe-blocked.https.html

<!doctype html>
<html>
<head>
    <script>
        if (window.testRunner) {
          // This test checks that active mixed subresources in iframes
          // are always blocked without asking the embedder. So the test
          // sets the embedder to allow running insecure content, and
          // then checks that the content is blocked despite the
          // embedder's setting.
          testRunner.setAllowRunningOfInsecureContent(true);
          testRunner.dumpAsText();
        }
    </script>
</head>
<body>
    <p>This test passes if the active subresource in the frame below is blocked.</p>
    <iframe src="resources/frame-with-insecure-css.html"></iframe>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/security/mixedContent/active-subresource-in-iframe-blocked.https.html