File: stacking-context-transform-losing-css-animation-in-delay.html

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<!DOCTYPE html>
<title>
CSS transform animation winning over web animation in delay phase creates
a stacking context
</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;
  animation: TransformNone 100s;
}
</style>
<span></span>
<div id="test"></div>
<script>
  document.getElementById("test")
    .animate({ transform: ['translateX(100px)', 'translate(100px)'] },
             { duration: 100000, delay: 100000 });

  requestAnimationFrame(function() {
    document.documentElement.classList.remove("reftest-wait");
  });
</script>