0px;
    width: 50px;
    height: 50px;
    background: skyblue;
  }
  #target.fallback {
    position-try-fallbacks: --200;
  }
  #target.anim {
    transition: left 1000s steps(2, start);
  }
  @position-try --200 {
    left: 200px;
  }
</style>
<div id=cb>
  <div id=target></div>
</div>
<script>
  function cleanup() {
    target.className = '';
    cb.className = '';
    // Clean up running transition
    target.getAnimations().forEach(a => a.cancel());
  }

  test((t) => {
    t.add_cleanup(cleanup);
  