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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>
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