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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
+<!--
+ Another variant of partial-prerender-translate-2.html, but the transform
+ animation is scaled by the parent element.
+ -->
+<style>
+html {
+ overflow: hidden;
+}
+body {
+ margin: 0px;
+ padding: 0px;
+}
+@keyframes anim {
+ /* translate to a position where the left edge of partial pre-rendered on */
+ /* the left edge of the viewport. */
+ 0% { transform: translateX(-649px); }
+ 100% { transform: translateX(-2000px); }
+}
+#target {
+ width: 4000px;
+ height: 2000px;
+ position: absolute;
+ transform: translateX(0);
+}
+</style>
+<div style="transform: scale(0.5); transform-origin: 0 0">
+ <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 4000 2000">
+ <rect fill="green" x="0" width="2250" height="2000"></rect>
+ <rect fill="red" x="2250" width="1750" height="2000"></rect>
+ </svg>
+ </div>
+</div>
+<script>
+document.addEventListener("MozReftestInvalidate", () => {
+ 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 (650px).
+ setTimeout(() => {
+ document.documentElement.classList.remove("reftest-wait");
+ }, 1000);
+ });
+}, { once: true });
+</script>
+</html>