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<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-color">
<link rel="match" href="background-color-animation-will-change-contents-ref.html">
<style>
.container {
width: 600px;
height: 600px;
will-change: contents;
/* Start with a short delay and ensure that we pick up the color change when
the animation enters the active phase. */
animation: bgcolor 10s steps(1, jump-start) backwards 0.2s;
}
@keyframes bgcolor {
0% { background-color: rgba(200, 0, 0, 1); }
100% { background-color: rgba(0, 200, 0, 1); }
}
</style>
<script src="/common/reftest-wait.js"></script>
<body>
<div class="container"></div>
<script>
function waitForActiveAnimation() {
const anim = document.getAnimations()[0];
return new Promise(resolve => {
const tick = () => {
requestAnimationFrame(() => {
if (anim.currentTime > 200)
resolve();
else
tick();
});
};
tick();
});
}
window.onload = async () => {
await waitForActiveAnimation();
takeScreenshot();
};
</script>
</body>
</html>
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