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<!DOCTYPE html>
<script src='test-helpers.js'></script>
<script src='messaging-serialize-helpers.js'></script>
<script src='message-target.js'></script>
<script id="inline_script">
  'use strict'

  if (window.parent !== null) {
    window.parent.postMessage('LOADED', { targetOrigin: '*' });
  }

  if (window.opener !== null) {
    window.opener.postMessage('LOADED', { targetOrigin: '*' });
  }

  // Use an undefined message target to send responses to
  // MessageEvent::source instead.
  const target = undefined;

  add_message_event_handlers(
    /*receiver=*/self, target, /*target_origin=*/'*');
</script>