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chromium/third_party/blink/web_tests/external/wpt/workers/semantics/multiple-workers/004.html 

<!doctype html>
<title>shared worker with multiple documents</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
setup({ single_test: true });

var i = 0;
var load_count = 0;

var w1 = new SharedWorker('004-2.js', 'x');
w1.port.onmessage = function(e) {
  i++;
  check_result();
};


function iframe_loaded() {
  load_count++;
  check_result();
}

function check_result() {
  //timeout to allow for extra, unexpected, messages to arrive
  if (i == 3 && load_count == 2) {
    setTimeout(function() {
      assert_equals(load_count, 2);
      assert_equals(i, 3);
      done();
    }, 500);
  }
}
</script>
<iframe src=004-1.html onload="iframe_loaded()"></iframe>
<iframe src=004-1.html onload="iframe_loaded()"></iframe>