css/css-conditional/container-queries/crashtests/top-layer-crash.html

<!DOCTYPE html>
<iframe width="800" srcdoc='<!DOCTYPE html>
                            <style>
                              .wrapper {
                                container: example / inline-size;
                                position: fixed;
                                width: 100%;
                              }
                              .inner {
                                display: none;
                              }
                              @container (min-width: 600px) {
                                .inner {
                                  display: block;
                                }
                              }
                            </style>
                            <div class="wrapper">
                              <div class="inner">
                                <dialog></dialog>
                              </div>
                            </div>
                            <script>
                              document.querySelector("dialog").showModal()
                            </script>'>
</iframe>
<script>
  window.onload = () => document.querySelector("iframe").width = 400;
</script>