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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>
<style>
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
#target {
width: 100px;
height: 100px;
background-color: lightblue;
will-change: transform;
}
@keyframes slideup {
0% { transform: translateY(0) }
30% { transform: translateY(0) }
31% { transform: translateY(-2000px) }
100% { transform: translateY(-2000px) }
}
</style>
<div id="target"></div>
<script>
promise_test(t => {
return new Promise(async function(resolve, reject) {
let entries = [];
let target = document.getElementById("target");
let observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes);
changes.forEach(entry => {
if (!entry.isIntersecting) {
resolve("Received not-intersecting notification before animationend.");
}
});
});
observer.observe(target);
await waitForNotification();
assert_equals(entries.length, 1);
assert_true(entries[0].isIntersecting);
target.style.animation = "3s linear slideup";
setTimeout(() => {
reject("Did not get a not-intersecting notification within 2 seconds.");
}, 2000);
});
}, "IntersectionObserver generates notifications when "
+ "a transform animation changes intersection state");
</script>
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