message: expandable banner focus shown on details
diff: content: "";
  }
  +@supports not selector(:has(.boxel-expandable-banner:focus-visible)) {
  .boxel-expandable-banner__summary:focus {
  outline: var(--boxel-outline);
  outline-offset: -4px;
  .boxel-expandable-banner__summary:focus:not(:focus-visible) {
  outline: transparent;
  }
  +}
  +
  +@supports selector(:has(.boxel-expandable-banner:focus-visible)) {
  + /* hide the focus outline here, but keep it visible for high contrast color schemes */
  + .boxel-expandable-banner__summary:focus {
  + outline: transparent;
  + }
  +
  + .boxel-expandable-banner__details:has(.boxel-expandable-banner__summary:focus-visible) {
  + outline: var(--boxel-outline);
  + }
  +}
  /* style our custom markers */
  .boxel-expandable-banner__summary-marker::before {
  