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Test Info:
<!DOCTYPE html>
<title>
Transform animation generates a containing block for fixed-pos descendants
even if the animation value is 'transform:none'
</title>
<style>
#parent {
visibility: hidden;
animation: anim 100s step-end;
}
#fixed {
position: fixed;
background-color: green;
height: 100px;
width: 100px;
}
#scroll {
overflow-y: scroll;
overflow-x: hidden;
height: 80px;
width: 100px;
}
@keyframes anim {
0% { transform: none; }
100% { transform: translateX(0px); }
}
</style>
<div id="scroll">
<div id="parent">
<div id="fixed"></div>
</div>
</div>