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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];
}