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-rw-r--r--layout/reftests/web-animations/stacking-context-transform-none-animation-before-appending-element.html31
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diff --git a/layout/reftests/web-animations/stacking-context-transform-none-animation-before-appending-element.html b/layout/reftests/web-animations/stacking-context-transform-none-animation-before-appending-element.html
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+++ b/layout/reftests/web-animations/stacking-context-transform-none-animation-before-appending-element.html
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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<!--
+ reftest-no-flush above is necessary to make invalidation changes happen.
+ Without it, reftest harness takes the snapshot on the next frame after the
+ frame that a paint for appending the element happened.
+ -->
+<title>Transform animation whose target is not initially associated with any document creates a stacking context even if it has only 'transform:none' in its keyframe</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+div {
+ width: 100px; height: 100px;
+ background: blue;
+}
+</style>
+<span></span>
+<script>
+ var div = document.createElement("div")
+ var anim = div.animate({ transform: ['none', 'none'] },
+ { duration: 100000 });
+ anim.ready.then(() => {
+ document.body.appendChild(div);
+ document.documentElement.classList.remove("reftest-wait");
+ });
+</script>