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diff --git a/layout/reftests/transform/partial-prerender-in-svg-3.html b/layout/reftests/transform/partial-prerender-in-svg-3.html
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+++ b/layout/reftests/transform/partial-prerender-in-svg-3.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
+<style>
+html {
+ overflow: hidden;
+}
+body {
+ margin: 0px;
+ padding: 0px;
+}
+@keyframes anim {
+ /* The reftest window size is (800x1000), which means the partial prerender */
+ /* area is (1125x400). Thus -325px(= 800 - 1125) is the boundary where jank */
+ /* happens, so we choose a value close to -325px so that within a next */
+ /* couple of frames jank should happen. */
+ 0% { transform: translateX(-324px); }
+ 100% { transform: translateX(-2000px); }
+}
+</style>
+<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400"
+ style="overflow: visible">
+ <g id="target">
+ <svg xmlns="http://www.w3.org/2000/svg" width="10000">
+ <rect fill="green" x="0" width="1125" height="400"></rect>
+ <rect fill="red" x="1125" width="800" height="400"></rect>
+ </svg>
+ </g>
+</svg>
+<script>
+document.addEventListener("MozReftestInvalidate", () => {
+ // A shorter animation-duration than we normally use (100s) because if we used
+ // the longer duration it may NOT fail this test even if any jank happens.
+ target.style.animation = "anim 10s 1s";
+ target.addEventListener("animationstart", () => {
+ // Wait a second to make sure the animation gets stucked (i.e. jank) at the
+ // boundary (325px).
+ setTimeout(() => {
+ document.documentElement.classList.remove("reftest-wait");
+ }, 1000);
+ });
+}, { once: true });
+</script>
+</html>