LayoutTests/http/tests/security/XFrameOptions/cross-origin-iframe-post-form-to-parent-same-origin-x-frame-options-page-allow.html

<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.dumpChildFramesAsText();
        testRunner.waitUntilDone();
    }
</script>

<p>There should be content in the iframe below</p>
<iframe style="width:500px; height:500px" src="http://localhost:8000/security/XFrameOptions/resources/post-form-to-x-frame-options-parent-same-origin-allow.html"></iframe>