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diff --git a/dom/tests/mochitest/webcomponents/test_shadowroot_youngershadowroot.html b/dom/tests/mochitest/webcomponents/test_shadowroot_youngershadowroot.html
new file mode 100644
index 000000000..17743321b
--- /dev/null
+++ b/dom/tests/mochitest/webcomponents/test_shadowroot_youngershadowroot.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1083587
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1083587</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1083587">Mozilla Bug 1083587</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<div id="host"></div>
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+
+/** Test for Bug 1083587 **/
+var hostInDoc = document.getElementById("host");
+var shadowOne = hostInDoc.createShadowRoot();
+is(shadowOne.olderShadowRoot, null);
+
+var shadowTwo = hostInDoc.createShadowRoot();
+is(shadowOne.olderShadowRoot, null);
+is(shadowTwo.olderShadowRoot, shadowOne);
+
+var hostNotInDoc = document.createElement("div");
+var shadowThree = hostNotInDoc.createShadowRoot();
+is(shadowThree.olderShadowRoot, null);
+
+var shadowFour = hostNotInDoc.createShadowRoot();
+is(shadowThree.olderShadowRoot, null);
+is(shadowFour.olderShadowRoot, shadowThree);
+
+</script>
+</body>
+</html>