file_location_href_unknown_protocol.html

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<!doctype html>

<script>

onbeforeunload = function() {

  opener.onChildBeforeUnload();

};

onload = async function() {

  let ongoingLoad = fetch(location.href);

  location.href = "this-protocol-is-unlikely-to-exist://foo";

  // Load shouldn't be canceled.

  await ongoingLoad;

  setTimeout(function() {

    opener.onChildLoadTimedOut();

  }, 1000);

};

onunload = function() {

  opener.onChildUnload();

};

</script>