VLEX/BPM-UI/node_modules/ngx-bootstrap/positioning/esm2015/utils/getOffsetParent.js

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Returns the offset parent of the given element
 */
import { getStyleComputedProperty } from './getStyleComputedProperty';
import { isIE } from './isIE';
/**
 * @param {?} element
 * @return {?}
 */
export function getOffsetParent(element) {
    if (!element) {
        return document.documentElement;
    }
    /** @type {?} */
    const noOffsetParent = isIE(10) ? document.body : null;
    // NOTE: 1 DOM access here
    /** @type {?} */
    let offsetParent = element.offsetParent || null;
    // Skip hidden elements which don't have an offsetParent
    /** @type {?} */
    let sibling;
    while (offsetParent === noOffsetParent
        && element.nextElementSibling
        && sibling !== element.nextElementSibling) {
        sibling = element.nextElementSibling;
        offsetParent = sibling.offsetParent;
    }
    /** @type {?} */
    const nodeName = offsetParent && offsetParent.nodeName;
    if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
        return sibling ? sibling.ownerDocument.documentElement : document.documentElement;
    }
    // .offsetParent will return the closest TH, TD or TABLE in case
    if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 &&
        getStyleComputedProperty(offsetParent, 'position') === 'static') {
        return getOffsetParent(offsetParent);
    }
    return offsetParent;
}
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