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-rw-r--r--layout/reftests/css-animations/replace-with-new-positive-delay-animation.html42
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diff --git a/layout/reftests/css-animations/replace-with-new-positive-delay-animation.html b/layout/reftests/css-animations/replace-with-new-positive-delay-animation.html
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+++ b/layout/reftests/css-animations/replace-with-new-positive-delay-animation.html
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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<style>
+@keyframes first {
+ 0% { opacity: 0; }
+ 100% { opacity: 0; }
+}
+@keyframes second {
+ 0% { opacity: 0.5; }
+ 100% { opacity: 0.5; }
+}
+#target {
+ width: 100px;
+ height: 100px;
+ opacity: 1;
+ background-color: green;
+}
+</style>
+<div id="target"></div>
+<script>
+document.addEventListener("MozReftestInvalidate", async () => {
+ target.style.animation = "first 100s";
+ await new Promise(resolve => {
+ target.addEventListener("animationstart", resolve);
+ });
+
+ // Wait two frames to make sure the animation is composited.
+ await new Promise(resolve => { requestAnimationFrame(resolve); });
+ await new Promise(resolve => { requestAnimationFrame(resolve); });
+
+ target.style.animation = "second 100s 100s";
+
+ // To take a snapshot in the delay phase, wait two frames instead of
+ // wait for the animationstart event.
+ await new Promise(resolve => { requestAnimationFrame(resolve); });
+ await new Promise(resolve => { requestAnimationFrame(resolve); });
+
+ document.documentElement.classList.remove("reftest-wait");
+}, { once: true });
+</script>
+</html>