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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=320799
+-->
+<head>
+  <title>Test for Bug 320799</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=320799">Mozilla Bug 320799</a>
+<p id="display">
+  <select id="s" style="width: 100px; box-sizing: border-box; border: 0">
+    <option>This is a test, it really is a test I tell you</option>
+  </select>
+  <select id="s2">
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+    <option>x</option>
+  </select>
+  <select id="s3">
+    <option>x</option>
+  </select>
+  <select id="s4" style="width: 100px; box-sizing: border-box; border: 0; margin: 10px">
+    <option>This is a test, it really is a test I tell you</option>
+  </select>
+</p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 320799 **/
+is($("s").scrollWidth, 100, "Scroll width should not include dropdown contents");
+is($("s2").clientWidth, $("s3").clientWidth,
+   "Client width should not depend on the dropdown's vertical scrollbar");
+
+is($("s4").scrollWidth, 100, "Scroll width should not include dropdown contents");
+</script>
+</pre>
+</body>
+</html>