about-blank-iframe-in-main-frame.html

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

var remainingMessages = 2;
window.addEventListener("message", function (e) {
    remainingMessages--;
    if (!remainingMessages && window.testRunner)
        testRunner.notifyDone();
}, false);

</script>
<p>This test opens a window iframe that loads an about:blank iframe.  We should
*not* trigger a mixed content callback because the about:blank iframes cannot
be corrupted by active network attackers.</p>
<script>
window.addEventListener('load', function () {
    window.open("https://127.0.0.1:8443/security/mixedContent/resources/frame-with-about-blank-frame.html");
});
</script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/security/mixedContent/about-blank-iframe-in-main-frame.html