mozilla-central/testing/web-platform/tests/uievents/mouse/mouseover-at-removing-mousedown-target.html

Source code

Revision control

Copy as Markdown

Other Tools

Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<meta name="variant" content="?duration=16"> <!-- 60fps -->
<meta name="variant" content="?duration=42"> <!-- 24fps -->
<title>Check whether `mouseup` events are fired after pending boundary events</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-actions.js></script>
<script src=/resources/testdriver-vendor.js></script>
<style>
div#parent {
width: 100%;
height: 50px;
background-color: gray;
}
div#child {
width: 100%;
height: 40px;
background-color: lime;
}
</style>
</head>
<body>
<div id="parent"><div id="child"></div></div>
<script>
"use strict";
const searchParams = new URLSearchParams(document.location.search);
const duration = parseInt(searchParams.get("duration"));
async function runTest(t) {
const parent = document.getElementById("parent");
const child = document.getElementById("child");
const mouseEvents = [];
function onMouseOverOrUp(event) {
// Ignore events before `mousedown` to make this test simpler.
if (mouseEvents[0]?.startsWith("mousedown")) {
mouseEvents.push(`${event.type}@${event.target.localName}${event.target.id ? `#${event.target.id}` : ""}`);
}
}
try {
child.getBoundingClientRect(); // flush layout
child.addEventListener("mousedown", event => {
event.target.remove();
mouseEvents.push("mousedown@div#child");
}, {once: true});
document.addEventListener("mouseover", onMouseOverOrUp, {capture: true});
document.addEventListener("mouseup", onMouseOverOrUp, {once: true, capture: true});
const actions = new test_driver.Actions(duration);
await actions.pointerMove(10, 10, {origin: child})
.pointerDown({button: actions.ButtonType.LEFT})
.pointerUp({button: actions.ButtonType.LEFT})
.send();
await new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
assert_equals(
mouseEvents.toString(),
"mousedown@div#child,mouseover@div#parent,mouseup@div#parent",
t.name
);
} finally {
document.removeEventListener("mouseover", onMouseOverOrUp, {capture: true});
parent.appendChild(child);
}
}
// This test tries to detect intermittent case that mouseout might be fired
// after a while from a DOM tree change. Therefore, trying same test 30 times.
for (let i = 0; i < 30; i++) {
promise_test(async t => {
await runTest(t);
// Make things stabler to start next test.
await new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
}, `mouseover should be fired before mouseup if mousedown target is removed (${i})`);
}
</script>
</body>
</html>