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<!DOCTYPE html>
<html class="reftest-wait">
<title>mask-size animation after finish</title>
<style>
@keyframes changeMaskSize {
from { mask-size: 50px 50px; }
to { mask-size: 25px 25px; }
}
#test {
height: 100px;
width: 100px;
mask-repeat: no-repeat;
mask-position: center center;
mask-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="50" height="50"><rect x="0" y="0" width="50" height="50" fill="blue"/></svg>');
animation: changeMaskSize 0.01s forwards;
}
#inner {
height: 100px;
width: 100px;
background-color: blue;
box-sizing: border-box;
/* Apply will-change property to force paint mask on mask layer */
border: 1px solid transparent;
will-change: transform;
}
</style>
<div id="test"><div id="inner"></div></div>
<script>
document.getElementById("test").addEventListener("animationend", () => {
requestAnimationFrame(() => {
document.documentElement.classList.remove("reftest-wait");
})
});
</script>
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