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<!DOCTYPE html>
<meta charset="utf-8">
<title>Event handlers processing algorithm: manual tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-event-handler-processing-algorithm">
<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
<style>
div[id^="d"] {
width: 100px;
height: 100px;
background-color: blue;
}
</style>
<div id="log"></div>
<p>Mouseover these four divs</p>
<div id="d1"></div>
<div id="d2"></div>
<div id="d3" onmouseover="return false"></div>
<div id="d4" onmouseover="return true"></div>
<script>
"use strict";
async_test(t => {
const div = document.querySelector("#d1");
div.onmouseover = t.step_func(() => false);
div.addEventListener("mouseover", t.step_func_done(e => {
assert_equals(e.defaultPrevented, true);
}));
}, "Listener added via JavaScript, returns false: cancels the event");
async_test(t => {
const div = document.querySelector("#d2");
div.onmouseover = t.step_func(() => true);
div.addEventListener("mouseover", t.step_func_done(e => {
assert_equals(e.defaultPrevented, false);
}));
}, "Listener added via JavaScript, returns true: does not cancel the event");
async_test(t => {
const div = document.querySelector("#d3");
div.addEventListener("mouseover", t.step_func_done(e => {
assert_equals(e.defaultPrevented, true);
}));
}, "Listener added via markup, returns false: cancels the event");
async_test(t => {
const div = document.querySelector("#d4");
div.addEventListener("mouseover", t.step_func_done(e => {
assert_equals(e.defaultPrevented, false);
}));
}, "Listener added via markup, returns true: does not cancel the event");
</script>
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