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node_modules/popper.js/src/utils/getOffsetParent.js

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+import getStyleComputedProperty from './getStyleComputedProperty';
+import isIE from './isIE';
+/**
+ * Returns the offset parent of the given element
+ * @method
+ * @memberof Popper.Utils
+ * @argument {Element} element
+ * @returns {Element} offset parent
+ */
+export default function getOffsetParent(element) {
+  if (!element) {
+    return document.documentElement;
+  }
+
+  const noOffsetParent = isIE(10) ? document.body : null;
+
+  // NOTE: 1 DOM access here
+  let offsetParent = element.offsetParent || null;
+  // Skip hidden elements which don't have an offsetParent
+  while (offsetParent === noOffsetParent && element.nextElementSibling) {
+    offsetParent = (element = element.nextElementSibling).offsetParent;
+  }
+
+  const nodeName = offsetParent && offsetParent.nodeName;
+
+  if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
+    return element ? element.ownerDocument.documentElement : document.documentElement;
+  }
+
+  // .offsetParent will return the closest TH, TD or TABLE in case
+  // no offsetParent is present, I hate this job...
+  if (
+    ['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 &&
+    getStyleComputedProperty(offsetParent, 'position') === 'static'
+  ) {
+    return getOffsetParent(offsetParent);
+  }
+
+  return offsetParent;
+}