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chromium/third_party/blink/web_tests/http/tests/security/mixedContent/insecure-image-in-main-frame.html 

<html>
<body>
<script>
if (window.testRunner) {
    testRunner.waitUntilDone();
    testRunner.dumpAsText();
    testRunner.setPopupBlockingEnabled(false);
}

window.addEventListener("message", function (e) {
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<p>This test opens a window that loads an insecure image.  We should trigger a
mixed content callback because the main frame in the window is HTTPS but is
displaying insecure content.</p>
<script>
window.open("https://127.0.0.1:8443/security/mixedContent/resources/frame-with-insecure-image.html");
</script>
</body>
</html>