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

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+import { isElement } from "./instanceOf.js";
+export default function getDocumentElement(element) {
+  // $FlowFixMe[incompatible-return]: assume body is always available
+  return ((isElement(element) ? element.ownerDocument : // $FlowFixMe[prop-missing]
+  element.document) || window.document).documentElement;
+}