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<!DOCTYPE html>
<title>
Transform animation creates a stacking context even though it has only
'transform:none' keyframes and with a style which prevents performning
the animation on the compositor.
</title>
<style>
span {
  height: 100px;
  width: 100px;
  position: fixed;
  background: green;
  top: 50px;
}
@keyframes TransformNone {
  from, to { transform: none }
}
#test {
  width: 100px; height: 100px;
  background: blue;
  transform-style: preserve-3d;
  animation: TransformNone 100s infinite;
}
</style>
<span></span>
<div id="test"></div>