:part(part-forwarded2) { color: green; }</style>
    <script>installCustomElement("custom-element-inner", "custom-element-inner-template");</script>
    <template id="custom-element-inner-template">
      <style>span { color: red; }</style>
      <span id="green_part" part="partp">This text</span>
    </template>
    <script>installCustomElement("custom-element-middle", "custom-element-middle-template");</script>
    <template id="custom-element-middle-template"><custom-element-inner id="c-e-inner" exportpa