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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">
+<!--
+ A test for a partial pre-rendered transform animation moves to a place where
+ the partial pre-rendered area is completely out of the viewport but still
+ there remains some amount of area of the entire transform element.
+ If we mis-recognize it as NOT a jank, checkerboading will happen.
+ -->
+<style>
+html {
+ overflow: hidden;
+}
+body {
+ margin: 0px;
+ padding: 0px;
+}
+@keyframes anim {
+ /* translate to a position the partial pre-rendered area is outside of the */
+ /* viewport but still there should remain visible area. */
+ to { transform: translateX(-150vw); }
+}
+#target {
+ width: 200vw;
+ height: 200vh;
+ position: absolute;
+ transform: translateX(0vw);
+}
+</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>
+document.addEventListener("MozReftestInvalidate", () => {
+ target.style.animation = "anim 100s 1s step-start";
+ target.addEventListener("animationstart", () => {
+ // animtionstart event is fired just before requestAnimationFrame callbacks,
+ // so we need to wait two rAF to make sure the initial animation value is
+ // composited on the compositor.
+ requestAnimationFrame(() => {
+ requestAnimationFrame(() => {
+ document.documentElement.classList.remove("reftest-wait");
+ });
+ });
+ });
+}, { once: true });
+</script>
+</html>