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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
  jank happens.
  -->
<style>
html {
  overflow: hidden;
}
body {
  margin: 0px;
  padding: 0px;
}
@keyframes anim {
  /* The reftest window size is (800x1000), which means the partial prerender */
  /* area is (1125x1125). 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); }
}
#target {
  width: 2000px;
  height: 2000px;
  position: absolute;
  transform: translateX(0px);
}
</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 2000 2000">
    <!-- green on the pre-render area -->
    <rect fill="green" x="0" width="1125" height="2000"></rect>
    <rect fill="red" x="1125" width="875" height="2000"></rect>
  </svg>
</div>
<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>