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Test Info:
<!DOCTYPE html>
<title>mask-size animation in delay phase</title>
<style>
@keyframes changeMaskSize {
from { mask-size: 50px 50px; }
to { mask-size: 50px 50px; }
}
#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="25" height="25"><rect x="0" y="0" width="25" height="25" fill="blue"/></svg>');
animation: changeMaskSize 100s 100s infinite;
}
#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>