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Test Info:
<!DOCTYPE html>
<title>
Opacity animation creates stacking context in delay phase
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
@keyframes Opaque {
from, to { opacity: 1 }
}
#test {
width: 100px; height: 100px;
background: blue;
animation: Opaque 100s 100s;
}
</style>
<span></span>
<div id="test"></div>