<fixture-test>
  <template shadowrootmode="open">
    <x-receiver>
      <template shadowrootmode="open">
        <slot>
        </slot>
      </template>
      <x-another>
        <template shadowrootmode="open">
          <slot>
          </slot>
        </template>
        <div>
          hello
        </div>
      </x-another>
      <div>
        world
      </div>
    </x-receiver>
  </template>
</fixture-test>