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diff --git a/layout/base/tests/bug1518339-2.html b/layout/base/tests/bug1518339-2.html
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+++ b/layout/base/tests/bug1518339-2.html
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+<!doctype html>
+<html class="reftest-wait">
+<title>user-select can be overriden on a contenteditable element</title>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<style>
+  div {
+    -webkit-user-select: all;
+    -moz-user-select: all;
+    user-select: all;
+  }
+</style>
+<div contenteditable="true">
+  You should be able to select <b>all</b> of me.
+</div>
+<script>
+SimpleTest.waitForFocus(function() {
+  const editable = document.querySelector('div[contenteditable="true"]');
+  editable.focus();
+  synthesizeMouseAtCenter(editable.querySelector("b"), {});
+  setTimeout(() => document.documentElement.removeAttribute("class"), 0);
+});
+</script>