testing/web-platform/tests/js/builtins/Promise-incumbent-global-subsubframe.sub.html


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<!DOCTYPE html>
<script>
  document.domain = "{{host}}";
  onmessage = function (e) {
    parent.postMessage(
      {
        actual: e.origin,
        expected: "{{location[scheme]}}://{{domains[www1]}}:{{ports[http][0]}}",
        reason: "Incumbent should have been the caller of then()"
      },
      "*");
  }
</script>