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Test Info:

<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<style>
html {
/* Suppress scrollbars to avoid periodical unthrottling for transform */
/* animations on the compositor. */
overflow: hidden;
}
body {
margin: 0px;
padding: 0px;
}
@keyframes anim {
0% { transform: translateX(100px); }
100% { transform: translateX(100px); }
}
#target {
width: 100px;
height: 100px;
position: absolute;
background-color: green;
}
</style>
<div id="target"></div>
<script>
document.addEventListener('MozReftestInvalidate', () => {
// Set a bit longer animation delay to avoid painting the initial animation
// style on the main thread.
target.style.animation = "anim 100s 1s";
target.addEventListener("animationstart", () => {
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.documentElement.classList.remove("reftest-wait");
});
});
});
}, { once: true });
</script>
</html>