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F4SDwebService/Scripts/src/utils/getFixedPositionOffsetParent.js

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+import getStyleComputedProperty from './getStyleComputedProperty';
+import isIE from './isIE';
+/**
+ * Finds the first parent of an element that has a transformed property defined
+ * @method
+ * @memberof Popper.Utils
+ * @argument {Element} element
+ * @returns {Element} first transformed parent or documentElement
+ */
+
+export default function getFixedPositionOffsetParent(element) {
+  // This check is needed to avoid errors in case one of the elements isn't defined for any reason
+   if (!element || !element.parentElement || isIE()) {
+    return document.documentElement;
+  }
+  let el = element.parentElement;
+  while (el && getStyleComputedProperty(el, 'transform') === 'none') {
+    el = el.parentElement;
+  }
+  return el || document.documentElement;
+
+}