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<!DOCTYPE html>
<link rel="author" href="mailto:graouts@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-animations/">
<link rel="help" href="https://drafts.csswg.org/selectors/#the-empty-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-animations/support/testcommon.js"></script>
<div class="container"></div>
<style>
.container {
width: 100px;
height: 100px;
background-color: rgb(0, 255, 0);
}
.container:empty {
background-color: rgb(255, 0, 0);
animation: anim 1s;
}
@keyframes anim { }
</style>
<script>
promise_test(async () => {
const container = document.querySelector(".container");
const computedStyle = getComputedStyle(container);
// Check that the :empty rule applies initially.
assert_equals(computedStyle.backgroundColor, 'rgb(255, 0, 0)',
'The initial background-color matches the value set by the :empty rule.');
// Await a couple of frames to let any animation-related style updates happen.
await waitForAnimationFrames(2);
// Append a child which should no longer let the :empty rule apply.
container.appendChild(document.createElement("span"));
assert_equals(computedStyle.backgroundColor, 'rgb(0, 255, 0)',
'The background-color after inserting a child into the container no longer matches the value set by the :empty rule.');
}, 'Setting an "animation" style property on an element does not interfere with the :empty pseudo-class.');
</script>
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