frame-with-data-url-frame-with-script.html

<script>
function frameLoaded() {
  if (window.opener)
    window.opener.postMessage('done', '*');
}
</script>
<iframe onload="frameLoaded()" src="data:text/html,<html><script src='http://example.test:8080/security/mixedContent/resources/script.js'></script></html>"></iframe>

chromium/third_party/blink/web_tests/http/tests/security/mixedContent/resources/frame-with-data-url-frame-with-script.html