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Test Info:

<!DOCTYPE html>
<title>
Opacity animation winning over another opacity animation in delay phase
on the main-thread creates a stacking context
</title>
<style>
span {
height: 100px;
width: 100px;
position: fixed;
background: green;
top: 50px;
}
@keyframes Opacity1 {
from, to { opacity: 1; }
}
@keyframes Opacity0 {
from, to { opacity: 0; }
}
// For preventing running on the compositor.
@keyframes Width {
from, to { width: 100px; }
}
#test {
width: 100px; height: 100px;
background: blue;
animation: Opacity0 100s 100s, Opacity1 100s, Width 100s;
}
</style>
<span></span>
<div id="test"></div>