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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/display-in-container.html 

<!doctype html>
<title>CSS Container Queries Test: @container queries affecting display type</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">
<link rel="match" href="display-in-container-ref.html">
<style>
  .container, .not_a_container {
    width: auto;
    height: 100px;
    border: 1px solid black;
    margin-bottom: 10px;
  }
  .container {
    container-type: size;
  }
  span {
    border: 1px solid green;
    margin: 2px;
  }

  /* Note: 150px - 2px, since .container has a 1px border */
  @container (min-width: 148px) {
    div { display: flex; }
    span { flex: 1; }
  }

  /* Note: 200px - 2px, since .container has a 1px border */
  @container (min-width: 198px) {
    div { display: revert; }
    span { display: block; }
  }

  /* Should not apply: */
  @container (min-width: 199px) {
    * { color: red; background-color: red; }
  }
</style>
<div style="width:150px">
  <div class=container>
    <main>
      <div>
        <span>Test1</span>
        <span>Test2</span>
        <span>Test3</span>
      </div>
    </main>
  </div>
</div>
<div style="width:200px">
  <div class=container>
    <main>
      <div>
        <span>Test1</span>
        <span>Test2</span>
        <span>Test3</span>
      </div>
    </main>
  </div>
</div>
<div style="width:150px">
  <div class=not_a_container>
    <main>
      <div>
        <span>Test1</span>
        <span>Test2</span>
        <span>Test3</span>
      </div>
    </main>
  </div>
</div>