File: stacking-context-transform-changing-keyframe-in-delay.html

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<!DOCTYPE html>
<html class="reftest-wait">
<title>
Changing keyframes to transform frames creates a stacking context even if the
animation is delay phase
</title>
<style>
span {
  height: 100px;
  width: 100px;
  position: fixed;
  background: green;
  top: 50px;
}
#test {
  width: 100px; height: 100px;
  background: blue;
}
</style>
<span></span>
<div id="test"></div>
<script>
  var anim = document.getElementById("test")
    .animate({ width: ['100px', '100px'] },
             { delay: 100000, duration: 100000 });
  anim.ready.then(function() {
    anim.effect.setKeyframes(
      { transform: ['translate(0px)', 'translate(0px)'] });
    document.documentElement.classList.remove("reftest-wait");
  });
</script>