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chromium/third_party/blink/web_tests/http/tests/inspector-protocol/page/resources/frame-requested-navigation-subframe.html 

<html>
  <body>
    <form method="POST" action="/inspector-protocol/resources/iframe.html" target="subframe-same-origin">
      <input type="hidden" name="step">
    </form>
    <form method="GET"
        action="http://oopif.test:8000/inspector-protocol/resources/iframe.html"
        target="subframe-cross-origin">
      <input type="hidden" name="step">
    </form>
    <iframe name="subframe-same-origin"></iframe>
    <iframe id="frame2" name="subframe-cross-origin" src="http://oopif.test:8000/inspector-protocol/resources/iframe.html"></iframe>
  </body>
</html>