element\n * @returns {Element} scroll parent\n */\nexport default function getScrollParent(element) {\n  // Return body, `getScroll` will take care to get the correct `scrollTop` from it\n  if (!element) {\n    return document.body\n  }\n\n  switch (element.nodeName) {\n    case 'HTML':\n    case 'BODY':\n      return element.ownerDocument.body\n    case '#document':\n      return element.body\n  }\n\n  // Firefox want us to check `-x` and `-y` variations as well\n  const { overflow, overflowX, overflowY...