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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<title>
+Transform animation creates a stacking context when changing its display style
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+div {
+ width: 100px; height: 100px;
+ background: blue;
+ display: none;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<script>
+ var anim = document.getElementById("test")
+ .animate({ transform: ['none', 'none'] }, { duration: 100000 });
+ anim.ready.then(function() {
+ anim.effect.target.style.display = 'block';
+ document.documentElement.classList.remove("reftest-wait");
+ });
+</script>