<!DOCTYPE html>
<p>This is a frame that tries to navigate its parent.</p>
<script>
window.onload = function() {
  try {
    parent.location.href = "data:text/html,\u003c!DOCTYPE html\u003e\u003cp\u003eIf this message appears, then this frame has been navigated by its child.\u003c/p\u003e\u003cscript\u003eparent.postMessage('can navigate', '*');\u003c/script\u003e";
  } catch(e) {
    parent.parent.postMessage("can not navigate", "*");
  }
}
</script>
