testing/web-platform/tests/html/browsers/browsing-the-web/unloading-documents/prompt-and-unload-script-uncloseable-1.html


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<!doctype html>
script-uncloseable-1
<script>
onbeforeunload = function() {
  parent.beforeunload_fired = true;
};
onunload = function() {
  parent.unload_fired = true;
};
</script>