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<!DOCTYPE html>
<title>Event handlers processing algorithm</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="foo" style="width: 100px; height: 100px; background-color: black"></div>
<script>
async_test(function(t) {
var ev = new Event('mouseover', {cancelable: true});
document.getElementById("foo").onmouseover = t.step_func(function() { return true });
document.getElementById("foo").dispatchEvent(ev);
assert_equals(ev.defaultPrevented, true)
t.done();
}, "mouseover listener returning true cancels event");
async_test(function(t) {
var ev = new Event('mouseover', {cancelable: true});
document.getElementById("foo").onmouseover = t.step_func(function() { return false; });
document.getElementById("foo").dispatchEvent(ev);
assert_equals(ev.defaultPrevented, false);
t.done();
}, "mouseover listener returning false doesn't cancel event");
async_test(function(t) {
var ev = new Event('beforeunload', {cancelable: true});
window.onbeforeunload = t.step_func(function() {return null});
window.dispatchEvent(ev);
assert_equals(ev.defaultPrevented, true);
t.done();
}, "beforeunload listener returning null cancels event");
async_test(function(t) {
var ev = new Event('beforeunload', {cancelable: true});
window.onbeforeunload = t.step_func(function() {return true});
window.dispatchEvent(ev);
assert_equals(ev.defaultPrevented, false);
t.done();
}, "beforeunload listener returning non-null doesn't cancel event");
async_test(function(t) {
var ev = new Event("click", {cancelable: true});
document.getElementById("foo").onclick = t.step_func(function() { return false; });
document.getElementById("foo").dispatchEvent(ev);
assert_equals(ev.defaultPrevented, true);
t.done();
}, "click listener returning false cancels event");
async_test(function(t) {
var ev = new Event("blur", {cancelable: true});
document.getElementById("foo").onblur = t.step_func(function() { return false; });
document.getElementById("foo").dispatchEvent(ev);
assert_equals(ev.defaultPrevented, true);
t.done();
}, "blur listener returning false cancels event");
async_test(function(t) {
var ev = new Event("dblclick", {cancelable: true});
document.getElementById("foo").ondblclick = t.step_func(function() { return false; });
document.getElementById("foo").dispatchEvent(ev);
assert_equals(ev.defaultPrevented, true);
t.done();
}, "dblclick listener returning false cancels event");
</script>
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