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diff --git a/layout/forms/test/test_bug903715.html b/layout/forms/test/test_bug903715.html
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+++ b/layout/forms/test/test_bug903715.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=903715
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 903715</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.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=903715">Mozilla Bug 903715</a>
+<p id="display"></p>
+<div id="content">
+  <form id="form" action="/">
+    <select id="select" name="select">
+      <option>1</option>
+      <option>2</option>
+      <option>3</option>
+      <option>4</option>
+      <option>5</option>
+      <option>6</option>
+      <option>7</option>
+      <option>8</option>
+      <option>9</option>
+    </select>
+    <input id="input-text" name="text" value="some text">
+    <input id="input-submit" type="submit">
+  </form>
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+SimpleTest.waitForFocus(runTests, window);
+
+function runTests()
+{
+  var form = document.getElementById("form");
+  form.addEventListener("keypress", function (aEvent) {
+    ok(false, "keypress event shouldn't be fired when the preceding keydown event caused closing the dropdown of the select element");
+  }, true);
+  form.addEventListener("submit", function (aEvent) {
+    ok(false, "submit shouldn't be performed by the Enter key press on the select element");
+    aEvent.preventDefault();
+  }, true);
+  var select = document.getElementById("select");
+  select.addEventListener("change", function (aEvent) {
+    var input = document.getElementById("input-text");
+    input.focus();
+    input.select();
+  });
+
+  select.focus();
+
+  select.addEventListener("popupshowing", function (aEvent) {
+    setTimeout(function () {
+      synthesizeKey("KEY_ArrowDown");
+      select.addEventListener("popuphiding", function (aEventInner) {
+        setTimeout(function () {
+          // Enter key should cause closing the dropdown of the select element
+          // and keypress event shouldn't be fired on the input element because
+          // which shouldn't cause sumbmitting the form contents.
+          ok(true, "Test passes if there is no error");
+          SimpleTest.finish();
+        }, 100);
+      });
+      // Close dropdown.
+      synthesizeKey("KEY_Enter");
+    }, 100);
+  });
+
+  // Open dropdown.
+  synthesizeKey("KEY_ArrowDown", { altKey: true });
+}
+</script>
+</body>
+</html>