File: iframe-trying-to-navigate-its-child.html

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