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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 case that the nearest oveflow:hidden scroll frame is the clip frame
  for the partial pre-render transform animation.
  -->
<style>
html, body {
  margin: 0;
  padding: 0;
}
#target {
  width: 30000px;
  height: 100px;
  transform: translateX(-2500px);
  /*
   * 1s delay so that we can avoid undesired composition, i.e. the first
   * composition on the composition would be the final transition value.
   */
  transition: transform 100s step-start 1s;
}
</style>
<div style="width: 50%; overflow: hidden">
  <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 30000 100">
      <rect fill="green" x="2500" width="400" height="100"></rect>
      <rect fill="blue" x="2900" width="100" height="100"></rect>
    </svg>
  </div>
</div>
<script>
document.addEventListener("MozReftestInvalidate", () => {
  target.style.transform = "translateX(-2600px)";
  target.addEventListener("transitionstart", () => {
    // Wait a second to make sure the transition has been composited on the
    // compositor.
    setTimeout(() => {
      document.documentElement.classList.remove("reftest-wait");
    }, 1000);
  });
}, { once: true });
</script>
</html>