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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/multiple-workers/008-1.html 

<!doctype html>
<title>008-1</title>
<script>
var w1 = new SharedWorker('008.js');
w1.port.onmessage = function(e) {
  e.ports[0].postMessage(2);
}
</script>