testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-tried-to-be-navigated-by-history.html


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<!DOCTYPE html>
<p>This is a frame that tries to navigate via history API.</p>
<script>
window.onmessage = (e) => {
  if (e.data == 'back') {
    history.back();
  } else if (e.data == 'forward') {
    history.forward();
  } else if (e.data = 'pushstateback') {
    onpopstate = (e) => {
      parent.postMessage('pushstatebackdone', '*');
    };

    history.pushState({someState: 'blah'}, '');
    history.back();
  }
};
</script>