page-with-nested-top-navigating-iframe.sub.html

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<!DOCTYPE html>

<meta charset="utf-8">

<script src=/common/get-host-info.sub.js></script>

<title>Page containing two nested iframes, with the inner iframe trying to navigate its top</title>

<script>

addEventListener('load', async () => {

  const { OTHER_ORIGIN } = get_host_info();

  const origin = OTHER_ORIGIN;

  const path = new URL("page-with-top-navigating-iframe.html?same_origin=true" , window.location).pathname;

  const iframe = document.createElement('iframe');

  iframe.src = origin + path;

  document.body.appendChild(iframe);

});

</script>