File: keyframe-easing-var-crash.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Animations: keyframe easing var() should not crash</title>
<meta name="assert" content="This should not crash.">
<style>
@keyframes kf {
  0% {
    transform: translateX(0px);
    animation-timing-function: var(--kf_ease);
  }
  100% {
    transform: translateX(100px);
  }
}

#target {
  width: 40px;
  height: 40px;
  background: #4a90e2;
  animation: kf 1s linear 1;
  will-change: transform;
}
</style>
<div id="target"></div>
<script>
  const target = document.getElementById("target");
  target.getAnimations();
  document.documentElement.style.setProperty("--kf_ease", "steps(2, start)");
  const animation = target.getAnimations()[0];
  animation.effect.getTiming();
  animation.effect.getKeyframes();
</script>