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chromium/third_party/blink/web_tests/http/tests/misc/form-target-iframe-inline.html 

<html>
<body>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}
</script>
<iframe id="theframe" name="theframe"></iframe>
<form action="resources/success-notify-done.html" id="theform" method="post" name="theform" target="theframe"></form>
<script>
document.forms['theform'].submit();
</script>
<div>
This text should be visible.
</div>
</body>
</html>