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diff --git a/dom/base/test/test_structuredclone_backref.html b/dom/base/test/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>