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node_modules/dom-helpers/esm/offsetParent.js

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+import css from './css';
+import ownerDocument from './ownerDocument';
+
+var isHTMLElement = function isHTMLElement(e) {
+  return !!e && 'offsetParent' in e;
+};
+
+export default function offsetParent(node) {
+  var doc = ownerDocument(node);
+  var parent = node && node.offsetParent;
+
+  while (isHTMLElement(parent) && parent.nodeName !== 'HTML' && css(parent, 'position') === 'static') {
+    parent = parent.offsetParent;
+  }
+
+  return parent || doc.documentElement;
+}