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<!DOCTYPE html>
<title>Node.moveBefore should not preserve CSS transition state when crossing shadow boundaries</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
  <section id="old-parent">
    <div id="item"></div>
  </section>
  <div id="shadow-container">
    <template shadowrootmode="open">
      <style>
        #item {
          width: 100px;
          height: 100px;
          background: green;
          transition: left 10s;
          position: absolute;
          left: 0;
        }

        section {
          position: relative;
        }

        body {
          margin-left: 0;
        }
      </style>
      <section id="new-parent">
      </section>
    </template>
  </div>
  <style>
    #item {
      width: 100px;
      height: 100px;
      background: green;
      transition: left 10s;
      position: absolute;
      left: 0;
    }

    section {
      position: relative;
    }

    body {
      margin-left: 0;
    }
  </style>
  <script>
    promise_test(async t => {
      const item = document.querySelector("#item");
      assert_equals(item.getBoundingClientRect().x, 0);
      item.style.left = "400px";
      await new Promise(resolve => item.addEventListener("transitionstart", resolve));
      const shadowContainer = document.querySelector("#shadow-container");
      shadowContainer.shadowRoot.querySelector("#new-parent").moveBefore(item, null);
      await new Promise(resolve => requestAnimationFrame(() => resolve()));
      assert_greater_than(item.getBoundingClientRect().x, 399);
    }, "Moving an element with a transition across shadow boundaries should reset the transition");
  </script>
</body>