File: top-layer-nested-crash.html

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<!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>
                            <body style="width: 600px;">
                              <div class="wrapper">
                                <div class="inner">
                                  <dialog>
                                    <div class="wrapper">
                                      <div class="inner">
                                        <dialog></dialog>
                                      </div>
                                    </div>
                                  </dialog>
                                </div>
                              </div>
                            </body>
                            <script>
                              const dialogs = document.querySelectorAll("dialog");
                              for (let dialog of dialogs) {
                                dialog.showModal();
                              }
                            </script>'>
</iframe>
<script>
window.onload = () => {
  const iframe = document.querySelector('iframe');
  iframe.width = 400;
  iframe.contentDocument.body.offsetTop;
  iframe.width = 800;
};
</script>