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<!DOCTYPE html>
<html>
<head>
<title>Discard a new BrowsingContext during window.open nested event loop</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script>
add_task(async function() {
const TOPIC = "dangerous:test-only:new-browser-child-ready";
let found = false;
function observer(subject, topic, data) {
let win = SpecialPowers.wrap(subject);
if (SpecialPowers.compare(win.opener, window)) {
found = true;
SpecialPowers.removeObserver(observer, TOPIC);
win.close();
// window.close() is not synchronous, so we need to wait for the
// BrowsingContext to actually become discarded after we call it, to
// make sure that the window provider actually has a discarded BC at the
// end of its own nested event loop.
SpecialPowers.Services.tm.spinEventLoopUntil(() => !win.opener);
}
}
SpecialPowers.addObserver(observer, TOPIC);
let win = window.open();
is(found, true, "Our observer should have fired for the new window");
is(win, null, "window.open() should return null when new window is already closed");
});
</script>
</body>
</html>
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