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diff --git a/dom/base/test/test_bug372086.html b/dom/base/test/test_bug372086.html
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+++ b/dom/base/test/test_bug372086.html
@@ -0,0 +1,96 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=372086
+-->
+<head>
+  <title>Test for Bug 372086</title>
+  <script 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=372086">Mozilla Bug 372086</a>
+<p id="display">
+  <div id="d" is="custom-div">abc</div>def
+</p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 372086 **/
+
+customElements.define("custom-div", class extends HTMLDivElement {
+  constructor() {
+    super();
+    this.attachShadow({ mode: "open" });
+    this.shadowRoot.innerHTML = `ghi<slot></slot>jkl`;
+  }
+}, {
+  extends: "div",
+});
+
+function runTest() {
+  let range = document.createRange();
+
+  var c = $("d").firstChild;
+  var a = $("d").nextSibling;
+
+  range.setStart(c, 1);
+  range.setEnd(c, 3);
+  is(range.startContainer, c, "Unexpected start container");
+  is(range.startOffset, 1, "Unexpected start offset");
+  is(range.endContainer, c, "Unexpected end container");
+  is(range.endOffset, 3, "Unexpected end offset");
+  is(range.toString(), "bc", "Unexpected range serialization");
+
+  let shadow = d.shadowRoot.firstChild;
+  // Should collapse the range, because can't determine order
+  range.setEnd(shadow, 2);
+  is(range.startContainer, shadow,
+     "Unexpected collapsed start container");
+  is(range.startOffset, 2, "Unexpected collapsed start offset");
+  is(range.endContainer, shadow,
+     "Unexpected collapsed end container");
+  is(range.endOffset, 2, "Unexpected collapsed end offset");
+  is(range.toString(), "", "Unexpected collapsed range serialization");
+
+  range.setEnd(a, 2);
+  range.setStart(a, 0);
+  is(range.startContainer, a, "Unexpected start container after");
+  is(range.startOffset, 0, "Unexpected start offset after");
+  is(range.endContainer, a, "Unexpected end container after");
+  is(range.endOffset, 2, "Unexpected end offset after");
+  is(range.toString(), "de", "Unexpected range serialization after");
+
+  shadow = d.shadowRoot.lastChild;
+  // Collapses because one endpoint is anonymous from point of view of
+  // the other.
+  range.setStart(shadow, 1);
+  is(range.startContainer, shadow,
+     "Unexpected newly collapsed start container");
+  is(range.startOffset, 1, "Unexpected newly collapsed start offset");
+  is(range.endContainer, shadow,
+     "Unexpected newly collapsed end container");
+  is(range.endOffset, 1, "Unexpected newly collapsed end offset");
+  is(range.toString(), "", "Unexpected collapsed range serialization");
+
+  range.setEnd(shadow, 3);
+  is(range.startContainer, shadow,
+     "Unexpected shadow start container");
+  is(range.startOffset, 1, "Unexpected shadow start offset");
+  is(range.endContainer, shadow,
+     "Unexpected shadow end container");
+  is(range.endOffset, 3, "Unexpected shadow end offset");
+  is(range.toString(), "kl", "Unexpected shadow range serialization");
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+addLoadEvent(SimpleTest.finish)
+</script>
+</pre>
+</body>
+</html>
+