<!doctype HTML>
<html class="reftest-wait">
<meta charset="utf8">
<title>CSS Content Visibility: element reslotting</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<link rel="match" href="container-ref.html">
<meta name="assert" content="element is correctly removed when slot assignment takes it into a skipped slot">

<script src="/common/reftest-wait.js"></script>

<script>
window.customElements.define("my-element", class extends HTMLElement {
  connectedCallback() {
      if (this.shadowRoot) {
        this.computeEdges_();
        return;
      }

      this.attachShadow({ mode: 'open' }).innerHTML = `
        <style>
          #locked {
            display: block;
            content-visibility: hidden;
          }
        </style>
        <slot name=unlocked></slot>
        <div id=locked>
          <slot name=locked></slot>
        </div>
      `;
  }
});
</script>

<style>
#container {
  width: 150px;
  height: 150px;
  background: lightblue;
}

div {
  width: 50px;
  height: 50px;
}
.composited { will-change: transform; }
#one { background: pink; }
#two { background: red; }
</style>

<div id=container>
  <my-element>
    <div id=one slot=unlocked>FAIL</div>
    <div id=two slot=locked>FAIL</div>
  </my-element>
</div>

<script>
// Ensure everything is loaded and rendered.
onload = () =>
  requestAnimationFrame(() =>
  requestAnimationFrame(() =>
  requestAnimationFrame(() => {
    // Reslot the element and composite the other one.
    one.slot = "locked";
    two.classList.add("composited");
    requestAnimationFrame(takeScreenshot);
})));
</script>
