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<!DOCTYPE html>
<title>Node moves to another document</title>
<link rel="author" title="Dominic Farolino" href="mailto:dom@chromium.org">
<link rel="help" href="https://crbug.com/40277823">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<body>
<script>
// This is a regression test for a Chromium bug: https://crbug.com/40277823.
// The test is reproducible by:
// 1. Creating a node with an event listener that the compositor cares about,
// in a different local root than this one.
// 2. Moving the node to *this* local root, which is different from the one it
// was created in.
// 3. Clicking the node, or otherwise firing an event at it for the event that
// the compositor cares about. The node's current local root (this
// document)'s EventHandlerRegistry should know that a node with this kind
// event listener has been added to this local root, and the compositor
// shouldn't be able to fast-path around the event. The event should invoke
// the event listener. In Chromium before https://crrev.com/c/6674259, the
// node's new local root's EventHandlerRegistry would not be updated to
// learn about the node's event listener, and when the event comes in, the
// compositor would fast-path around it and fail to fire the listener. This
// test ensures that the listener is fired, even after the cross-local-root
// adoption.
promise_test(async t => {
const crossOriginChild = document.createElement('iframe');
const crossOriginChildURL =
new URL('resources/cross-origin-middle-frame-2.html',
get_host_info().HTTP_REMOTE_ORIGIN + location.pathname);
crossOriginChild.src = crossOriginChildURL;
const grandchildLoadPromise = new Promise(resolve => {
window.onmessage = e => {
if (e.data === 'grandchild loaded') {
resolve();
}
}
});
document.body.append(crossOriginChild);
await grandchildLoadPromise;
const sameOriginGrandchild = window.frames[0][0];
assert_not_equals(sameOriginGrandchild.document, null,
"same-origin grandchild frame exists");
const grandchildButton = sameOriginGrandchild.button;
assert_not_equals(grandchildButton, null);
// After this current document adopts the node with an event listener from a
// different local frame root, the event listener should still function on the
// adopted node.
document.body.append(grandchildButton);
await test_driver.click(grandchildButton);
assert_array_equals(sameOriginGrandchild.events, ['pointerdown'],
"the document now hosting the adopted node recognizes the pointerdown " +
"event handler on the adopted node, and allows it to fire after " +
"adoption");
}, "Event handler-bearing node moved across local roots and its event " +
"listeners still work");
</script>
</body>
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