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

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    testRunner.dumpAsText();
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<p>This test opens a window iframe that loads a data URL iframe.  We should
*not* trigger a mixed content callback because the data URL cannot be corrupted
by active network attackers.</p>
<script>
window.open("https://127.0.0.1:8443/security/mixedContent/resources/frame-with-data-url-frame.html");
</script>
</body>
</html>