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+++ b/layout/reftests/css-animations/stacking-context-transform-win-in-delay-on-main-thread.html
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+<!DOCTYPE html>
+<title>
+Transform animation winning over another transform animation in delay phase
+on the main-thread creates a stacking context
+</title>
+<style>
+span {
+  height: 100px;
+  width: 100px;
+  position: fixed;
+  background: green;
+  top: 50px;
+}
+@keyframes TransformNone {
+  from, to { transform: none; }
+}
+@keyframes Transform100px {
+  from, to { transform: translateX(100px); }
+}
+// For preventing running on the compositor.
+@keyframes Width {
+  from, to { width: 100px; }
+}
+#test {
+  width: 100px; height: 100px;
+  background: blue;
+  animation: Transform100px 100s 100s, TransformNone 100s, Width 100s;
+}
+</style>
+<span></span>
+<div id="test"></div>