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function getRelativeClientRect(el) {
  var rect = el.getBoundingClientRect(),
      parentRect = el.offsetParent.getBoundingClientRect();
  return {
    bottom: parentRect.bottom - rect.bottom,
    height: rect.height,
    left: rect.left - parentRect.left,
    right: parentRect.right - rect.right,
    top: rect.top - parentRect.top,
    width: rect.width
  };
}