nav-cancelation-2-helper.html

Enable keyboard shortcuts

<!DOCTYPE html>

<meta charset="utf-8">

<title>Page with child frame that navigates slowly</title>

<!--

  This file is used by `../nav-cancelation-2.sub.html`. The iframe below is its

  grandchild iframe, and whenever its load event fires we report this up to our

  parent Document.

-->

<iframe src="slow.py"></iframe>

<script>

  window.parent.postMessage("grandchild frame created", "*");

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

  iframe.onload = e => {

    window.parent.postMessage("grandchild frame loaded", "*");

};

</script>