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+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Event.returnValue</title>
+  <link rel="author" title="Chris Rebert" href="http://chrisrebert.com">
+  <link rel="help" href="https://dom.spec.whatwg.org/#dom-event-returnvalue">
+  <meta name="flags" content="dom">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+  <div id="log"></div>
+  <script>
+test(function() {
+  var ev = new Event("foo");
+  assert_true(ev.returnValue, "returnValue");
+}, "When an event is created, returnValue should be initialized to true.");
+test(function() {
+  var ev = new Event("foo", {"cancelable": false});
+  assert_false(ev.cancelable, "cancelable (before)");
+  ev.preventDefault();
+  assert_false(ev.cancelable, "cancelable (after)");
+  assert_true(ev.returnValue, "returnValue");
+}, "preventDefault() should not change returnValue if cancelable is false.");
+test(function() {
+  var ev = new Event("foo", {"cancelable": false});
+  assert_false(ev.cancelable, "cancelable (before)");
+  ev.returnValue = false;
+  assert_false(ev.cancelable, "cancelable (after)");
+  assert_true(ev.returnValue, "returnValue");
+}, "returnValue=false should have no effect if cancelable is false.");
+test(function() {
+  var ev = new Event("foo", {"cancelable": true});
+  assert_true(ev.cancelable, "cancelable (before)");
+  ev.preventDefault();
+  assert_true(ev.cancelable, "cancelable (after)");
+  assert_false(ev.returnValue, "returnValue");
+}, "preventDefault() should change returnValue if cancelable is true.");
+test(function() {
+  var ev = new Event("foo", {"cancelable": true});
+  assert_true(ev.cancelable, "cancelable (before)");
+  ev.returnValue = false;
+  assert_true(ev.cancelable, "cancelable (after)");
+  assert_false(ev.returnValue, "returnValue");
+}, "returnValue should change returnValue if cancelable is true.");
+test(function() {
+  var ev = document.createEvent("Event");
+  ev.returnValue = false;
+  ev.initEvent("foo", true, true);
+  assert_true(ev.bubbles, "bubbles");
+  assert_true(ev.cancelable, "cancelable");
+  assert_true(ev.returnValue, "returnValue");
+}, "initEvent should unset returnValue.");
+test(function() {
+  var ev = new Event("foo", {"cancelable": true});
+  ev.preventDefault();
+  ev.returnValue = true;// no-op
+  assert_true(ev.defaultPrevented);
+  assert_false(ev.returnValue);
+}, "returnValue=true should have no effect once the canceled flag was set.");
+  </script>
+</body>
+</html>