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Test Info:
<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<style>
@keyframes anim {
from { background-color: white; }
to { background-color: red; }
}
</style>
<body>
</body>
<script>
window.addEventListener('load', () => {
const body = document.querySelector('body');
body.style.animation = 'anim 100s step-end reverse';
body.addEventListener('animationstart', () => {
// This MozAfterPaint event corresponds to the white background paint.
// (The animation will initially paint the background red since it is playing
// a step-end animation in reverse.)
window.addEventListener('MozAfterPaint', () => {
// the MozAfterPaint we received is not the one what we were waiting for.
// Note that we can't just wait for one more MozAfterPaint since in the
// case where everything works correctly, we won't get another
// MozAfterPaint for a long time due to the step-end timing function
// applied to the animation.
requestAnimationFrame(() => {
document.documentElement.classList.remove('reftest-wait');
});
}, {once: true});
});
});
</script>
</html>