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sample/dev/talk/bundle/popper-2.11.8/esm/dom-utils/getParentNode.js

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+import getNodeName from "./getNodeName.js";
+import getDocumentElement from "./getDocumentElement.js";
+import { isShadowRoot } from "./instanceOf.js";
+export default function getParentNode(element) {
+  if (getNodeName(element) === 'html') {
+    return element;
+  }
+
+  return (// this is a quicker (but less type safe) way to save quite some bytes from the bundle
+    // $FlowFixMe[incompatible-return]
+    // $FlowFixMe[prop-missing]
+    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
+    element.parentNode || ( // DOM Element detected
+    isShadowRoot(element) ? element.host : null) || // ShadowRoot detected
+    // $FlowFixMe[incompatible-call]: HTMLElement is a Node
+    getDocumentElement(element) // fallback
+
+  );
+}