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/* eslint-disable no-cond-assign, no-continue */
import css from './css';
import height from './height';
import isDocument from './isDocument';
/**
* Find the first scrollable parent of an element.
*
* @param element Starting element
* @param firstPossible Stop at the first scrollable parent, even if it's not currently scrollable
*/
export default function scrollParent(element, firstPossible) {
var position = css(element, 'position');
var excludeStatic = position === 'absolute';
var ownerDoc = element.ownerDocument;
if (position === 'fixed') return ownerDoc || document; // @ts-ignore
while ((element = element.parentNode) && !isDocument(element)) {
var isStatic = excludeStatic && css(element, 'position') === 'static';
var style = (css(element, 'overflow') || '') + (css(element, 'overflow-y') || '') + css(element, 'overflow-x');
if (isStatic) continue;
if (/(auto|scroll)/.test(style) && (firstPossible || height(element) < element.scrollHeight)) {
return element;
}
}
return ownerDoc || document;
}