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<title>Lostpointercapture fires on document when target is removed</title>
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<h1>Pointer Events - lostpointercapture removes new capture element</h1>
<input type="button" id="button" value="Set Capture"><br>
<div id="target0"></div>
<div id="target1"></div>
<script type='text/javascript'>
var target0 = document.getElementById('target0');
var target1 = document.getElementById('target1');
var captureButton = document.getElementById('button');
var targets = [target0, target1, captureButton];
const LOG_EVENT_TYPES = ['pointerover', 'pointerenter', 'pointerdown', 'pointermove', 'pointerup', 'pointercancel', 'pointerout', 'pointerleave', 'gotpointercapture', 'lostpointercapture'];
promise_test(async (test) => {
captureButton.focus();
var events = [];
var lastLogMessage = "";
let logEvent = (event) => {
let logMessage = `${event.type}@${event.target.id || event.target.tagName || 'document'}`;
// Only log a particular event once to avoid coalescing differences.
if (logMessage == lastLogMessage)
return;
lastLogMessage = logMessage;
events.push(logMessage);
};
document.addEventListener('lostpointercapture', logEvent);
for (const target of targets) {
for (const eventType of LOG_EVENT_TYPES) {
target.addEventListener(eventType, logEvent);
}
}
const nextSibling = target1.nextSibling;
test.add_cleanup(() => {
document.removeEventListener('lostpointercapture', logEvent);
for (const target of targets) {
for (const eventType of LOG_EVENT_TYPES) {
target.removeEventListener(eventType, logEvent);
}
}
nextSibling.parentNode.insertBefore(target1, nextSibling);
});
let finishPromise = Promise.any([
getEvent('pointerup', document.body, test),
getEvent('pointerup', target1, test)]);
getEvent('pointerdown', captureButton, test).then((event) => {
target0.setPointerCapture(event.pointerId);
});
// On the first captured move, we'll set capture to target1.
getEvent('pointermove', target0, test).then((event) => {
target1.setPointerCapture(event.pointerId);
});
// But remove the new capture target when we lose capture.
getEvent('lostpointercapture', target0, test).then((event) => {
target1.remove();
});
getEvent('gotpointercapture', target1, test).then((event) => {
assert_unreached("target1 is removed and should never get pointer capture.");
});
// Inject mouse inputs.
const actions = new test_driver.Actions();
actions_promise = actions
.pointerMove(0, 0, {origin: captureButton})
.pointerDown()
.pointerMove(10, 0, {origin: captureButton})
.pointerUp()
.send();
await finishPromise;
assert_equals(events.join(", "), [
// Pointer down on button
"pointerover@button", "pointerenter@button", "pointermove@button", "pointerdown@button",
// Captured by target0
"pointerout@button", "pointerleave@button", "pointerover@target0", "pointerenter@target0", "gotpointercapture@target0", "pointermove@target0",
// Captured by target1, losing capture on target0 which removes target1.
"lostpointercapture@target0", "pointerout@target0", "pointerleave@target0",
// Uncaptured pointer re-enters button and is lifted.
"pointerover@button", "pointerenter@button", "pointermove@button", "pointerup@button"
].join(", "));
}, "setPointerCapture target removed by lostpointercapture");
</script>
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