/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
if (typeof document !== 'undefined' && !document.elementsFromPoint) {
    document.elementsFromPoint = elementsFromPoint;
}
/*tslint:disable*/
/**
 * Polyfill for `elementsFromPoint`
 *
 * https://developer.mozilla.org/en-US/docs/Web/API/Document/elementsFromPoint
 * https://gist.github.com/iddan/54d5d9e58311b0495a91bf06de661380
 * https://gist.github.com/oslego/7265412
 * @param {?} x
 * @param {?} y
 * @return {?}
 */
export function elementsFromPoint(x, y) {
    /** @type {?} */
    const elements = [];
    /** @type {?} */
    const previousPointerEvents = [];
    /** @type {?} */
    let current;
    // TODO: window.getComputedStyle should be used with inferred type (Element)
    /** @type {?} */
    let i;
    /** @type {?} */
    let d;
    //if (document === undefined) return elements;
    // get all elements via elementFromPoint, and remove them from hit-testing in order
    while ((current = document.elementFromPoint(x, y)) && elements.indexOf(current) === -1 && current != null) {
        // push the element and its current style
        elements.push(current);
        previousPointerEvents.push({
            value: current.style.getPropertyValue('pointer-events'),
            priority: current.style.getPropertyPriority('pointer-events')
        });
        // add "pointer-events: none", to get to the underlying element
        current.style.setProperty('pointer-events', 'none', 'important');
    }
    // restore the previous pointer-events values
    for (i = previousPointerEvents.length; (d = previousPointerEvents[--i]);) {
        elements[i].style.setProperty('pointer-events', d.value ? d.value : '', d.priority);
    }
    // return our results
    return elements;
}
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