function getOffsetParent(element) {
    if (!element) {
      return document.documentElement;
    }

    var noOffsetParent = isIE(10) ? document.body : null;

    // NOTE: 1 DOM access here
    var offsetParent = element.offsetParent || null;
    // Skip hidden elements which don't have an offsetParent
    while (offsetParent === noOffsetParent && element.nextElementSibling) {
      offsetParent = (element = element.nextElementSibling).offsetParent;
    }

    var 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;
  }
Returns the offset parent of the given element
@method
@memberof Popper.Utils
@argument {Element} element
@returns {Element} offset parent