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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<style>
#target {
animation: red 100s;
}
@keyframes red {
0% { background-color: red; }
100% { background-color: red; }
}
@keyframes green {
0% { background-color: green; }
100% { background-color: green; }
}
div {
background-color: green;
width: 100px;
height: 100px;
}
</style>
<div id="target"></div>
<script>
document.addEventListener('MozReftestInvalidate', () => {
requestAnimationFrame(() => {
document.styleSheets[0].cssRules[0].style.animationName = 'green';
document.documentElement.classList.remove('reftest-wait');
});
}, false);
</script>