parseFloat(styles.borderLeftWidth, 10);\n\n  // In cases where the parent is fixed, we must ignore negative scroll in offset calc\n  if(fixedPosition && isHTML) {\n    parentRect.top = Math.max(parentRect.top, 0);\n    parentRect.left = Math.max(parentRect.left, 0);\n  }\n  let offsets = getClientRect({\n    top: childrenRect.top - parentRect.top - borderTopWidth,\n    left: childrenRect.left - parentRect.left - borderLeftWidth,\n    width: childrenRect.width,\n    height: childrenRect.height,\n  });\n  offsets.marginTop...