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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>
<script>
var entries = [];
var popup, target;
function waitForPopupNotification(f) {
popup.requestAnimationFrame(function() {
popup.requestAnimationFrame(function() { popup.setTimeout(f); });
});
}
async_test((t) => {
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes);
});
popup = window.open();
t.add_cleanup(() => popup.close());
target = popup.document.createElement('div');
target.style.width = "100px";
target.style.height = "100px";
observer.observe(target);
waitForPopupNotification(t.step_func(() => {
assert_equals(entries.length, 1, "Initial notification for detached target.");
assert_equals(entries[0].isIntersecting, false, "not intersecting");
popup.document.body.appendChild(target);
waitForPopupNotification(t.step_func_done(() => {
assert_equals(entries.length, 2, "Notification after insertion into popup.");
assert_equals(entries[1].isIntersecting, true, "intersecting");
}));
}));
}, "IntersectionObserver with target in a different window.");
</script>
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