<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <title>Microtask checkpoint after window.onerror events (classic)</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="resources/checkpoint-after-error-event.js"></script>
  <script>self.postMessage("foo");</script>
</head>