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<!DOCTYPE html>
<title>Chrome issue 40925697: animatestart / animateend incorrectly called on load</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#events">
<link rel="help" href="https://crbug.com/40925697">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
@keyframes scale-up {
from {
scale: 0;
}
}
#target {
display: block;
width: 400px;
height: 400px;
margin: 150vh auto;
animation: scale-up linear forwards;
animation-timeline: view();
animation-range: entry 0% cover 50%;
}
</style>
<img id="target" src="data:image/svg,">
<script>
promise_test(async t => {
let start_count = 0;
let end_count = 0;
target.addEventListener("animationend", () => end_count++);
target.addEventListener("animationstart", () => start_count++);
const anim = target.getAnimations()[0];
await anim.ready;
await waitForNextFrame();
await waitForNextFrame();
assert_equals(start_count, 0, "animationstart not triggered before scrolling");
assert_equals(end_count, 0, "animationend not triggered before scrolling");
target.scrollIntoView();
await waitForNextFrame();
await waitForNextFrame();
assert_equals(start_count, 1, "animationstart triggered by scroll");
assert_equals(end_count, 1, "animationend triggered after scroll");
}, "Animation events triggered correctly");
</script>
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