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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/crashtests/dialog-backdrop-crash.html 

<!DOCTYPE html>
<style>
  html {
    overflow: hidden;
  }

  dialog {
    container-type: size;
    width: 100px;
    height: 100px;
  }

  @container (width > 1px) {
    dialog::backdrop {
      margin: 10px;
      background-color: green;
    }
  }
</style>
<dialog id=dialog>
  Hello World
</dialog>
<script>
  dialog.showModal();
</script>