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/** * Gets the scroll value of the given element in the given side (top and left) * @method * @memberof Popper.Utils * @argument {Element} element * @argument {String} side `top` or `left` * @returns {number} amount of scrolled pixels */ export default function getScroll(element, side = 'top') { const upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft'; const nodeName = element.nodeName; if (nodeName === 'BODY' || nodeName === 'HTML') { const html = element.ownerDocument.documentElement; const scrollingElement = element.ownerDocument.scrollingElement || html; return scrollingElement[upperSide]; } return element[upperSide]; }