ElementChild.getHTML({
            serializableShadowRoots: true}),
            `${correctShadowHtml}${lightDOMContent}`);
      } else {
        assert_equals(wrapper.getHTML({serializableShadowRoots: true}), emptyElement);
      }
      // If we provide the shadow root, serialize it, regardless of serializableShadowRoots.
      assert_equals(wrapper.getHTML({serializableShadowRoots: true, shadowRoots:
          [shadowRoot]}),correctHtml);
      assert_equals(wrapper.getHTML({serializableShadowRoots: fals