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diff --git a/layout/base/tests/bug1423331-3.html b/layout/base/tests/bug1423331-3.html
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+++ b/layout/base/tests/bug1423331-3.html
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+<!doctype html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>Test for bug 1423331: Contenteditable insertion with pseudo-elements</title>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<style>
+#editable {
+  outline: 1px solid black;
+  width: 300px;
+  height: 100px;
+}
+#editable::before {
+  content: "Write here";
+}
+</style>
+<div id="editable" contenteditable></div>
+<script>
+SimpleTest.waitForFocus(function() {
+  let div = document.getElementById("editable");
+  synthesizeMouse(div, 2, 2, {});
+  synthesizeMouse(div, 2, 2, {});
+  document.documentElement.className = "";
+});
+</script>
+</html>