1 files changed, 43 insertions, 0 deletions
diff --git a/layout/reftests/transform/partial-prerender-expansion-translate.html b/layout/reftests/transform/partial-prerender-expansion-translate.html
new file mode 100644
index 0000000000..60f2240a54
--- /dev/null
+++ b/layout/reftests/transform/partial-prerender-expansion-translate.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<style>
+html {
+  overflow: hidden;
+}
+body {
+  margin: 0px;
+  padding: 0px;
+}
+@keyframes anim {
+  from { transform: translateX(0px); }
+}
+#target {
+  width: 200vw;
+  height: 100vh;
+  position: absolute;
+  /* Some part of this element needs to be visible initially so that  */
+  /* a display item for this element is generated, thus the transform */
+  /* animation runs on the compositor.                                */
+  transform: translateX(90vw);
+}
+</style>
+<div id="target">
+  <!--
+    Put an SVG element so that the transform display item has a blob on
+    Webrender which means this test properly fails without the proper fix.
+    -->
+  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+    <rect fill="green" width="16" height="16"></rect>
+  </svg>
+</div>
+<script>
+// Waiting MozReftestInvalidate event makes this test fail for some reasons.
+// so we use window.onload instead.
+window.onload = () => {
+  target.style.animation = "anim 100s step-end reverse";
+  target.addEventListener("animationstart", () => {
+    document.documentElement.classList.remove("reftest-wait");
+  });
+};
+</script>
+</html>