File: test_structuredclone_backref.html

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<!DOCTYPE HTML>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1538622">Mozilla Bug 1538622</a>

<script>
  SimpleTest.waitForExplicitFinish();

  let o1 = new ImageData(25, 1),
      o2 = new ImageData(50, 1),
      o3 = new ImageData(75, 1),
      o4 = new ImageData(100, 1);

  let data = {
    img1: o1,
    img2: o2,
    img3: o3,
    img4: o4,
    img5: o4,
  };

  window.addEventListener("message", windowMessage);

  window.postMessage(data);

  function windowMessage(e) {
    let dataCopied = e.data;
    ok(dataCopied.img5 instanceof ImageData, "backref ImageData should still be an ImageData");
    is(dataCopied.img5, dataCopied.img4, "backref ImageData should be the referenced one");
    SimpleTest.finish();
  }
</script>