EventTarget-dispatchEvent-returnvalue.html

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

<!DOCTYPE html>

<meta charset=utf-8>

<title>EventTarget.dispatchEvent: return value</title>

<link rel="help" href="https://dom.spec.whatwg.org/#concept-event-dispatch">

<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-preventdefault">

<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-returnvalue">

<link rel="help" href="https://dom.spec.whatwg.org/#dom-event-defaultprevented">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id=log></div>

<table id="table" border="1" style="display: none">

    <tbody id="table-body">

    <tr id="table-row">

        <td id="table-cell">Shady Grove</td>

        <td>Aeolian</td>

    </tr>

    <tr id="parent">

        <td id="target">Over the river, Charlie</td>

        <td>Dorian</td>

    </tr>

    </tbody>

</table>

<script>

test(function() {

    var event_type = "foo";

    var target = document.getElementById("target");

    var parent = document.getElementById("parent");

    var default_prevented;

    var return_value;

    parent.addEventListener(event_type, function(e) {}, true);

    target.addEventListener(event_type, function(e) {

        evt.preventDefault();

        default_prevented = evt.defaultPrevented;

        return_value = evt.returnValue;

    }, true);

    target.addEventListener(event_type, function(e) {}, true);

    var evt = document.createEvent("Event");

    evt.initEvent(event_type, true, true);

    assert_true(parent.dispatchEvent(evt));

    assert_false(target.dispatchEvent(evt));

    assert_true(default_prevented);

    assert_false(return_value);

}, "Return value of EventTarget.dispatchEvent() affected by preventDefault().");

test(function() {

    var event_type = "foo";

    var target = document.getElementById("target");

    var parent = document.getElementById("parent");

    var default_prevented;

    var return_value;

    parent.addEventListener(event_type, function(e) {}, true);

    target.addEventListener(event_type, function(e) {

        evt.returnValue = false;

        default_prevented = evt.defaultPrevented;

        return_value = evt.returnValue;

    }, true);

    target.addEventListener(event_type, function(e) {}, true);

    var evt = document.createEvent("Event");

    evt.initEvent(event_type, true, true);

    assert_true(parent.dispatchEvent(evt));

    assert_false(target.dispatchEvent(evt));

    assert_true(default_prevented);

    assert_false(return_value);

}, "Return value of EventTarget.dispatchEvent() affected by returnValue.");

</script>