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+++ b/layout/forms/test/test_bug869314.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=869314
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 869314</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <style type="text/css">
+    .selectbox {
+      background-color: #00FF00;
+    }
+  </style>
+
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=869314">Mozilla Bug 869314</a>
+<p id="display"></p>
+<div id="content">
+
+  <select id="selectbox1" name="non-native selectbox" class="selectbox">
+    <option value="item">test item</option>
+  </select>
+
+  <select id="selectbox2" name="native selectbox">
+    <option value="item">test item</option>
+  </select>
+
+  <script type="application/javascript">
+  let Cc = SpecialPowers.Cc;
+  let Ci = SpecialPowers.Ci;
+  let sysInfo = Cc["@mozilla.org/system-info;1"].getService(Ci.nsIPropertyBag2);
+  let osName = sysInfo.getProperty("name");
+  let isNNT = SpecialPowers.getBoolPref("widget.non-native-theme.enabled");
+  if (osName == "Darwin" && !isNNT) { // Native styled macOS form controls.
+    // This test is for macOS with native styled form controls only. See bug for more info.
+    ok(document.getElementById("selectbox1").clientWidth >
+       document.getElementById("selectbox2").clientWidth,
+       "Non-native styled combobox does not have enough space for a " +
+       "dropmarker!");
+  } else {
+    // We need to call at least one test function to make the test harness
+    // happy.
+    ok(true, "Test wasn't ignored but should have been.");
+  }
+  </script>
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>