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

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<!DOCTYPE html>
<html class="reftest-wait">
<title>
Changing target to an element that does not overrider transform animations
creates a stacking context even if the animation is delay phase
</title>
<style>
span {
  height: 100px;
  width: 100px;
  position: fixed;
  background: green;
  top: 50px;
}
#first {
  width: 100px; height: 100px;
  background: blue;
  transform: none ! important;
}
#second {
  width: 100px; height: 100px;
  background: blue;
}
</style>
<span></span>
<div id="first"></div>
<div id="second"></div>
<script>
  var anim = document.getElementById("first")
    .animate({ transform: ['translateX(0px)', 'translateX(100px)'] },
             { delay: 100000, duration: 100000 });
  anim.ready.then(function() {
    anim.effect.target = document.getElementById("second");
    document.documentElement.classList.remove("reftest-wait");
  });
</script>