ost.attachShadow({mode: 'closed', delegatesFocus:true});
  outerShadow.appendChild(innerHost);
  const outerShadowChild = document.createElement('input');
  outerShadow.appendChild(outerShadowChild);

  const innerShadow = innerHost.attachShadow({mode: 'closed', delegatesFocus:innerDelegatesFocus});
  const innerShadowChild = document.createElement('input');
  innerShadow.appendChild(innerShadowChild);

  document.body.insertBefore(outerHost, document.body.firstChild);
  return {outerHost: outerHost,
      