File: animation-on-empty-height-frame.html

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<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<style>
@keyframes anim {
  from { background-color: white; }
  to { background-color: red; }
}
</style>
<body>
</body>
<script>
window.addEventListener('load', () => {
  const body = document.querySelector('body');
  body.style.animation = 'anim 100s step-end reverse';
  body.addEventListener('animationstart', () => {
    // This MozAfterPaint event corresponds to the white background paint.
    // (The animation will initially paint the background red since it is playing
    // a step-end animation in reverse.)
    window.addEventListener('MozAfterPaint', () => {
      // FIXME: Bug 1341294. We need to wait for one more frame in the case
      // the MozAfterPaint we received is not the one what we were waiting for.
      // Note that we can't just wait for one more MozAfterPaint since in the
      // case where everything works correctly, we won't get another
      // MozAfterPaint for a long time due to the step-end timing function
      // applied to the animation.
      requestAnimationFrame(() => {
        document.documentElement.classList.remove('reftest-wait');
      });
    }, {once: true});
  });
});
</script>
</html>