Function getFixedPositionOffsetParent

app/src/static/js/react-bootstrap.js:3563–3576

* 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

(element)

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;
  }

  var el = element.parentElement;

  while (el && getStyleComputedProperty(el, 'transform') === 'none') {
    el = el.parentElement;
  }

  return el || document.documentElement;
}
/**
 * Computed the boundaries limits and return them
 * @method