Event-returnValue.html

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This WPT test may be referenced by the following Test IDs:
- /dom/events/Event-returnValue.html - WPT Dashboard Interop Dashboard

<!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>