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<!DOCTYPE html>
<html>
<head>
    <script id="worker1" type="javascript/worker">
        self.onmessage = async function (e) {
          const abort = new AbortController()
          self.close()
          try { await self.scheduler.postTask(async () => abort.abort(undefined), { 'signal': abort.signal }) } catch (e) {}
          self.queueMicrotask(async () => abort.abort(undefined))
        }
    </script>
    <script>
      document.addEventListener('DOMContentLoaded', () => {
        const blob = new Blob([document.querySelector('#worker1').textContent], { type: 'text/javascript' })
        const worker = new Worker(window.URL.createObjectURL(blob))
        worker.postMessage([], [])
      })
    </script>
</head>
</html>